13 best cycle mirrors

• 🎁 TOOL-FREE INSTALLATION: Suitable for 22mm-32mm bicycle handlebar. Equipped with 2 anti-slip rubber gaskets for increased friction, which can hold the lens to the mirror holder for it to stay in place and can be attached to any fitted handlebars firmly and easily
• 🎁 MULTI ANGLE ADJUSTMENT: Our Bike Handlebar Mirror is an important investment for any cyclist who wants to avoid neck strain because of the flexible pole, makes it super easy to get the perfect viewing angle no matter your preference
• 🎁 SAFER CYCLING: No doubt cycling is fun and with a clear view mirror you can see whats behind you or coming up real fast. These days drivers are distracted on the phone or not paying attention and as cyclist we need to watch out
• 🎁 360 DEGREE ROTATABLE GLASS: Movable lens can be angled at any time to see what is coming from different directions. The optimized chassis is fixed with double screws, When installed, two additional gaskets can be placed to keep the mirror fixed and tighter
• 🎁 FEATHER LIGHT & STURDY: Even though it weighs just 115g; you'll be pleasantly surprised by how sturdy this mirror is. The strong polymer & aluminum construction makes this cycling mirror a perfect combination of ultra-strength & feature weight

Product features

360° Rotatable Bike Rear Mirror Wide Angle Lightweight Bicycle Handlebar Mirror with 2 Rubber Gaskets

The rear-view mirror of this product has been optimized and can be installed on the handlebar and designed to give you clear visuals of the road conditions behind you to help keep you safe from road accidents.

• Add 2 rubber gaskets to fill the gap between mirror and handlebar, making the mirror more stable.
• 360 degree rotatable, with all-round adjustment function, let you find the angle that suits you.
• Mini-shaped, designed with a compact shape to reduce the burden on the rider during riding.

Easy installation & Won't bumps

• Suitable for 22mm -32mm bicycle handlebar, comes with 2* Rubber Gaskets, easy install & anti slip, enhance stability.
• Bendable pole design can adjust to any desired angle while won't bounce even riding on bumpy road.

Applicable To Any Angle

Enhance your peripheral vision & forget accidents!

The long arm of the mirror gives optimum coverage.

Our rear view mirror is fully rotatable and provides

full vision behind you.

Why Do We Need To Install A Rear Mirror?

A road bike is a means of transportation when riding. Many people like to exercise by bicycle, but safety is the most important. For the rider, the motor vehicle on the road is a big source of danger. It is necessary to accurately identify the current road condition. West Biking Drop Bar Bike Mirror is installed at the end of the handlebars of the road bike which does not hinder your riding, and in the meanwhile, remains stylish!

Product description

This unique cyclist's mirror has 3 pivot points for total adjustment. Fully adjustable lightweight rear view mirror, can be fitted to either eye glasses or a helmet visor. Mirror face is adjusted by rotating at a 90 degree angle from the wire, and rotates fore and aft for the fine angle adjustments. The mirror has a wide field of vision. It can be attached to either your eye glasses or helmet visor. Adjusts to fit on right or left side. Frameless acrylic mirror provides wide, uninterrupted field of vision. Three point attachement system adjusts for a secure fit without vibration. Made in USA. Features: Three pivot points for total adjustability Wide field of vision Durable stainless steel & brass frame with an optically correct acrylic mirror  

Unique and extremely usable, the Bike Peddler Take A Look Cycling cyclist's mirror easily fits on helmet visors and eyeglasses. With three pivot points for maximum adjustment, the mirror face is adjusted by rotating it at a 90-degree angle from the wire. The mirror rotates fore and aft for fine angle adjustments. An ideal tool to keep an eye on traffic approaching from behind, the frameless acrylic mirror provides a wide, uninterrupted field of vision.

For added adjustment, the mirror is designed to fit on both the right or left side, and its 3-point attachment system adjusts for a secure fit without vibration. Available in two sizes: compact, which extends 50 millimeters and has a mirror size of 20x37 millimeters (HxW) and normal, which extends 85 millimeters and has a mirror size of 28x37 millimeters (HxW). Made in the USA, this mirror is backed by a manufacturer's unconditional guarantee.

• Cycling Eyeglass Mirror
• Color :Silver
• Size : Compact

User questions & answers

Question:	i want to wear this on my eye glasses when I walk. I have been caught off guard when people approach me from behind. I am assuming they will work
Answer:	Put a piece of the velcro on your helmet. I put mine on the left side on the upper side of one of the vents. Then you can add the mirror and remove it when you don't need it. I use it on my road bike and then take it off when I ride my commuter bike that has its own mirror.
Question:	What are the dimensions of the mirror itself
Answer:	I have had no problem with the mirror falling out, it seems very solid. I have only had it for a month, and only ride streets and not rough trails. Hopefully that helps.
Question:	compact or original size
Answer:	Egg shape, 1" x 1.5". Picks up PLENTY of the view behind you. I love this mirror. Don't know how I rode without it before
Question:	What should I see in the mirror when adjusted correctly? I have been unable to see things directly behind me that are far off
Answer:	No it doesn't fold but it does twist up mostly out of the way.

• Lens–Blast-resistant safety glass lens with anti-glare coating High–Definition,Anti-glare, Car Used Safe Glass Lens
• Body–Eco-friendly impact resistant fiber-reinforced nylon
• Clamp–High strength aluminum alloy
• Use–Fits ***22.2mm*** Diameter Handlebar ; hex key 4mm / Recommend 2Nm torque!!
• Sliver Lens–Anti-glare 50% ; Blue Lens–Anti-glare 75%

User questions & answers

Question:	Will this fit the standard handlebars that come on a trek fx 7.3 bike? don't have tool to measure. thank you
Answer:	Hi there, Our mirror will fit if your handlebars outer DIAMETER is 22.2mm(Standard Size). If you don’t mind, I suggest you buy it and try it out. This is the more accurate way to know. Thank you for your understanding! Please let me know if you need any further assistance.
Question:	will it fit either side of the handle bar
Answer:	Hi lan, There is an option for either left or right side. Please let me know if you need any further assistance.
Question:	Where are they manufactured
Answer:	Hi Keith, Our products are made in Taiwan. Please let me know if you need any further information.
Question:	Hi, i want to order this mirror but i’m confused when you describe by color. silver or blue??? are you describing the mirror color or the housing
Answer:	Hi there, The colors are of the lens itself. The frame is black.

Product features

Fits Most Bikes:

This handlebar mirror fits 22.2mm handlebar (standard size) and is suitable for all conventional bikes such as e-bikes, mountain bikes, beach cruiser bikes, city bikes, hybrid bikes and your bike. Without any complicated tools, this mirror can be installed hassle-free.

Stylish Design:

A stylish bike needs a stylish mirror too. This mirror has a look that will perfectly complement your bike. The neutral black color looks great on all types of bikes and the sharp hexagon shape adds to its style. Perfect for all kinds of bikes.

Park With Ease:

We all have faced this. Your bike mirror comes in your way while you are parking at confined places. That is why we have designed this mirror to be foldable. Foldable design makes this mirror great for commuting on the bus, parking in discreet places, or parking in the garage.

View Comfortably:

This mirror can be adjusted up to 360 degrees, which allows you to get maximum coverage of the road. No more neck strains and uncomfortable viewing; this mirror helps you broaden your horizon and lets you know what’s coming from behind.

• UNBREAKABLE STAINLESS STEEL LENS - perfect for commuting bikes to prevent hitting from breaking the lens
• WIDE RANGE FITTING: Fits 14.8~23 mm inside diameter of the handlebar (OPEN ENDED GRIPS or CUT A HOLE). *****Doesn't work for Trek Isozone grips. *****
• UNIVERSAL DESIGN - Can be installed on both left & right, and top of the handlebar & below the handlebar
• ALL TYPES OF BIKES - Road bikes, MTB, E-bikes and etc. 5mm hex key required for installation.
• Made in Taiwan, Patented, Passed EU REACH test (Chemical Test) to ensure it is safe to use the products

User questions & answers

Question:	Has anyone fit this mirror on to a lectric xp bike ? i suspect that it will probably involve either slitting the end of the grip or cutting a hole
Answer:	I had to cut a whole in my hand grip so the mirror could slide in. Easy to do and mirror very easy to install
Question:	I broke the bracket around the mirror when I dropped my wife's bike. Is it possible to get a replacment mirror only? (exclude mount
Answer:	Not in this Consumer World ! Maybe you can 2-part epoxy the the bracket (?) I use epoxy on EVERY THING ! ( AT least the mirror itself is stainless steel, methinks.)
Question:	How stable is mount? I'be tried several bike mirrors over the years and almost all vibrate so bad that I can't even see anything in it
Answer:	I generally like this mirror on my road bike with drop bars, but it vibrates like crazy. It is Ok on smooth flat roads at 15mph or so, but if you go 30 mph down a chip-and-sealed road, you won't be able so see anything useful. It helps a little to ride in the drops, where the weight, pressure, and compliance of your hands and arms dampen the vibrations.
Question:	Will it work on drop bar bikes? Can you actually see cars behind you
Answer:	I have it installed on my drop bar bike, I can see cars behind me when I remember to look at it and I have it adjusted correctly.

Product features

Foldable Frame

Hafny Bike Mirror barely takes any space while parking. It is good for commuting on the bus or parking in the garage. The joint is sturdy and flexible. You can rotate the mirror 360 degree, and never have to worry about the mirror getting knocking down.

Clear Stainless Steel Lens

Do you know that the mirror lens is made of well-polished stainless steel?

Compared to regular glass mirrors, the stainless steel lens is fully recyclable and unbreakable!

In case any accidents happens, the Hafny stainless steel lens mirror will stay strong with you!

Ideal for Most of the Bikes!

This little mirror works for both of the road bike drop bars, and also MTB handlebars!

Product description

The ultimate, hassle-free solution for cyclists on city streets and on narrow, winding country roads who need an effective way to see what's coming up behind them. The unique "Gumby"-like Kraton covered wire makes Reflex the first and only flexible and fully adjustable helmet mirror. The generously oval shaped mirror on Reflex provides a larger field of view than other mirrors and its vertical aspect increases depth of field. Adjust or remove Reflex easily No Hassle Installation Removable Extra Wide Angle View Fits On All Helmets Stays in Adjustment Weighs only 0.7 ounces (21.8 grams)

• Rear-view mirror for biking--mounts on any bike helmet
• Kraton covered wire allows for full flexibility
• Large oval shape and vertical aspect for an extra wide angle view
• Base adheres permanently; mirror detaches easily
• Weighs just 0.7 ounces (21.8 grams)

User questions & answers

Question:	Can you buy just the mirror
Answer:	Yes, it can be adjusted in 360 degrees.
Question:	Can this be mounted on either side? May be a dumb question... but, all documentation has been left side prominent
Answer:	Absolutely! This is solid, I highly recommend this. You can move it to another helmet, I have dropped this a few times and it stayed in tact.
Question:	Does anyone have reliable contact info for the manufacturers? The website on the package isn't active
Answer:	It is neither glass nor metal. There is a plastic coating over the mirror. My guess is a thin reflecive material under the plastic that is lightweight. There is no distortion in the mirror either.
Question:	What size it the mirror
Answer:	This is a personal fit issue. I just measured mine and from the front edge of the helmet it is 3 inches to the mirror. I wear glasses and this fit works for me. Additionally, depending on the size of the zip ties you use, you can extend it out further if that suits you better.

Product description

Package Included:1pcs rearview mirror

Dimensions: length 17 cm / 6.69 inches; width 6 cm / 2.36 inches (approximately)

100% brand new, high quality

Material: Aluminum alloy

Color: as shown

Features:

1. Made of high-quality ABS material, strong and durable, long service life.

2. Unique design, fine workmanship and beautiful appearance.

Portable and small size, easy to carry and use.

Rotation is adjustable, can rotate 360 degrees, can be conical rotation.

3. Can be installed on sunglasses and helmets, a good riding.

Quality first, provide the best service. Customers are our friends.

Stylish design, 100% brand new and high quality!

Note:

1. For photos, please allow slight color difference

2. Due to manual measurement, the size may be different

• 360 Degree rotation mirror, 3 pivot points for total adjustability. Adjusts for both left-side and right-side use.
• Lightweight mirror: Ultra-light to wear. No any additional weight on the side of your glasses. Can be attached to either your eye glasses or helmet visor.
• Durable: ABS electroplating flat mirror and aluminum rod. Scratch resistance and no risk on mirror breaking. The short arm of this mirror minimizes the vibration and improves visibility.
• Clear view: Only a glance of it, uninterrupted wide and clear vision easy to get. You can find the most suitable place to have a great view after several adjustments.
• A must have for cyclists: Bicycle glasses mirror allows you to have a clear view of traffic and other cyclist approaching. Increase your safety on the road, added the feeling of security to you.

Product description

View the world behind with this bar end mounted bicycle mirror Convex mirror with it's wide field of view is adjustable to any viewing angle. Mounts in minutes with included wrench. Fits handlebars with 15.8-23.4mm (0.62-0.92") inside diameters

The Mountain Bicycle Mirror from Mirrycle provides a wide view of the cars behind you, so that you don't have to turn your head as you bike. Designed to fit mountain bike style handlebars, the three-inch round mirror mounts on your handlebar's bar end in minutes with the included wrench. Thanks to its convex glass and pivoting design, the mirror offers a wide field of view to any viewing angle of the road behind you--so that you can remain focused on the road ahead.

• Three-inch round, handlebar mounted rearview mirror for bicycles
• Wide view convex mirror pivots to any viewing angle
• Mounts onto bar end of handle bar
• Fits inside handlebars with 13.75 to 22.5 inside diameters
• Sport type: Cycling

User questions & answers

Question:	Will it fit on women's Giant comfort bike
Answer:	It is designed to fit on large and small diameter handlebars. I have two bikes and it fits on both of them.
Question:	Is the mirror made of glass or plastic? Is it convex or flat? The description states it's convex but reading some of the reviews indicate it is flat (not convex
Answer:	This mirror is CONVEX, both in its physical shape and in its optics. This is written on July 6, 2018, and I am in full agreement with "downhiller"'s answer of January 30, 2016. For those of you who think this mirror is "flat", put the straight edge of a ruler across it - I guarantee you it is not flat, but CONVEX. If still in doubt, just look at your face and head in the mirror. If what you see is the true size of your head, then I will concede that the mirror is flat, and you have a small head.
Question:	will it work on right or left side and i have canondale hybiide will it fit
Answer:	It will work right or left side and comes with 2 adapters for large and small diameter holes. You will have to cut the ends of the grips to make work.
Question:	Will it clamp over the end of the rubber handle grip at the end like in the picture? Or does it have to go on the bar? Wheres the handle rubber grip in the photo? I dont get it
Answer:	As others have said, the mirror is attached to the INSIDE of the handlebar. You'll need to cut a hole in the end of the grip in order to install it. Slip the anchor bolt mechanism inside the handlebar, turn the screw to tighten, and you're done. Easy-peazy. Note: That's assuming the handlebar is hollow, like most bikes. In my case, installing in a Xiaomi M365 scooter, it doesn't work. The Xiaomi's handlebar is not hollow, it contains another tube for wiring. So, the Mirrcycle mirror doesn't fit in this instance.

Product features

Mirrycle Generic Mountain Bike Mirror

The Mountain Mirrycle mounts in minutes with the wrench that is included. The mirror is a 3" round, convex glass mirror with a wide field of view. The mirror is adjustable to any viewing angle.

Fits inside handlebars with 13.75mm - 22.5mm (.54" to .875") inside diameters.

• Lens–Blast-resistant safety glass ens with anti-glare coating High–Definition,Anti-glare, Car Used Safe Glass Lens
• Body–Eco-friendly impact resistant fiber-reinforced nylon ; ***Adjustable arm length design***
• Clamp–High strength aluminum alloy
• Use–***Fits 22.2mm Diameter Handlebar***; hex key 4mm (Not Included)/ Recommend 2Nm torque!! (Only one side) (***DOESN"T FIT DROP BAR***)
• ***Frame is Black***Sliver Lens–Anti-glare 50% ; Blue Lens–Anti-glare 75%

User questions & answers

Question:	This is just for
Answer:	Yes, this is just for one side! We sell them separately, so you can choose what you need,left,right or both side:)
Question:	Will this work on my trek road bike? Thanks
Answer:	It will not work. Drop style road bike handlebars are 23.8mm diameter. This mirror is designed for mountain bike handlebars with a 22.2mm diameter.
Question:	will this work on a 2020 surface rook
Answer:	I have no idea. I had to send it back as it wouldn’t work on my Trex bike
Question:	Hi 2019 Canondale quick disk 3 hybrid bike, is Meachow mirrow fits to my handlbar? I measured the handle bar it turns out to be 23.8mm
Answer:	Hi there, Sorry, (23.8mm)it will not fit... Our mirror is designed for 22.2mm(standard size) handlebars. Thank you for your understanding!

• SAFETY: Keep yourself confident with safe equipment by using the world's most trusted bicycle safety mirrors. hold true.
• RELIABILITY: Whether out bicycling on Sunday or commuting to work failure isn't an option. When other brands rattle and spin out of position, SprinTech mirrors
• EASY INSTALL: Remove the end cap and replace with the Sprintech cap. Then fit the female cap receptor with the mirror's male insert.
• VISIBILITY: No more looking over your shoulder and wondering if the vehicle approaching is too close for comfort. Give yourself time to react.
• LIGHT: Under 30 grams (with plug), they are amazingly light yet shatterproof.

User questions & answers

Question:	do you have to remove the handlebar wrap tape for them to fit, if so then what about the wrap tape
Answer:	You should be able to remove your existing plug(s) and insert the mirror without removing any bar tape. Once in they are snug and don't move unless I knock them with my knee. These are amazing and useful mirrors. I don't ride without them.
Question:	Would these work on a kids bike? (20 inch
Answer:	I believe these will work on all size bikes with down turned handlebars
Question:	What size handlebars will it fit
Answer:	The SPRINTECH road bike drop bar mirror plug will fit round bars with a minimum internal measurement of 18mm and maximum internal measurement of 22mm. They will fit some oval bars but the internal measurement would need to be closer to the 22mm than 18mm. We have found softening the bar end plug in hot water helps with insertion. Once the plug is inserted all the way don’t try to remove it as it will break off.
Question:	So, if I wanted to save the "R side" mirror as a back up to later put on the left, it wouldn't work on the left side
Answer:	It will work fine, but it won't be symmetrical. The right and left mirrors have opposing curves. It would look more like this ) ( than this ( ).

Product description

IMPORTANT NOTE - Please Read This

Because of a slight error on our part, we forgot to tell many of our customers that when they receive their mirror, it'll be covered with a protective transparent film. Unfortunately, some of these customers left a 1-star review thinking that they received a damaged/scratched mirror!

FREE Lifetime Replacement Warranty!

In the unlikely event that your mirror gets damaged or broken, just contact us and we'll send you a free replacement! Your satisfaction is our #1 priority.

To make sure you are buying an original product that is covered by our Lifetime Replacement Warranty, ensure that the product is “Sold by Royals Touch Inc.”

• IMPORTANT NOTE: Know that when you receive this product at your door, there will be a transparent protective film covering the mirror. This is to make sure the mirror remains crystal clear & doesn't get scratched during shipment. Please take off this protective film before using the product!
• FAST & EASY INSTALLATION - Easily attaches to your helmet in less than 60 seconds using an ultra-strong velcro pad. Just line it up exactly where you want it, then lock in your preferred adjustment - and you’re done! Once locked, the mirror stays in position so you never have to worry about it vibrating during your rides. Mounts on both left side and right side with ease.
• PERFECT REARVIEW VISION - Crystal view flat mirror helps you accurately judge the distance of objects behind you much better than a curved or convex mirror. 360° of adjustment allows you to use your peripheral vision to accurately see everything behind, while maintaining a clear view of the road ahead. The shaft length places the mirror at a perfect distance in front of you so it stays steady even during bumpy rides.
• FEATHER LIGHT & STURDY - Even though it weighs just 12g; you’ll be pleasantly surprised by how sturdy this mirror is. The strong polymer & aluminum construction makes this cycling mirror a perfect combination of ultra-strength & feather weight.
• LIFETIME REPLACEMENT WARRANTY & 90 day no-questions-asked money back guarantee.

User questions & answers

Question:	How to attach it to the helmet? Are there more detailed instructions
Answer:	Not that I know of. But you can have my mirror. My sister threw away the sticky tabs that adhere the mirror to the helmet.
Question:	Does the glass mirror ever fall out of its frame
Answer:	If you mount it on the right side, the arm will point upward and the mirror will be above the helmet. The arm would have to be reshaped so that the mirror points downward. The arm is flexible, but i don't know if it will bend 90 degrees. The mirror itself can be rotated 360 degrees.
Question:	What are the dimensions of the mirror itself
Answer:	no
Question:	Does this fold up & out of vision's way like Boba Fett's range finder/antenna
Answer:	its about 2 inches length about 1 1/2 wide. I love mine! perfect size!

• LIGHTWEIGHT AND DURABLE：Each one only weight 29g; plastic mirror, silicon rubber backing plate and handle, very durable.
• PLASTIC CONVEX MIRROR: Mountain bike mirror feature the convex mirror with its wide field of view and is adjustable to any viewing angle.
• MULTI-FUNCTION: Base with 360 degrees full rotation and could adjust to any direction to help you watch every direction of your back. Mirror with 180 Degree Plane Rotation to adjust mirror place.
• ADJUSTABLE BUCKLE STRAP：Designed with adjustable rubber buckle strap, suits for the handlebar of diameter 15MM-35MM.
• EASY TO INSTALL: No tools required. Just snap on mounting with rubber strap. Well mounted in minutes. Please confirm the purchase of the "TAGVO" to prevent copy/flaud.

User questions & answers

Question:	Can you use on road bikes on the dropbar
Answer:	These do not stay in place well. I had to keep adjusting along the ride for my daughter. I put them on as tight as possible with the rubber straps provided but they still slip and spin as she rides. Would not suggest these.
Question:	What is dimension of mirror
Answer:	Just under 3.15” the diagram on the listing shows 3.15” but there’s a teeny lip that the mirror rests in.
Question:	Are these mirrors removable? I need that quality bec I have a fold up bike and need to get them out of way when fold up
Answer:	Yes, relatively easily. I use them on my on/off road dirt bike and remove them when I go off road. To get a tighter fit you can wrap the handlebar with electrical tape as well
Question:	Are extra straps available for purchase
Answer:	As far as I know no straps are available and these mirerors lasted about a week .... straps broke one one and the mirror fell off the other !!!!!

Product features

PERFECT FOR CYCLING

Providing the best vision for cycling

180 DEGREE

Bike mirror with 180 degree plane rotation to adjust mirror place

MULTI-FUNCTION

Base with 360 degrees full rotation and could adjust to any direction to help you watch every direction of your back

PROTECTIVE FILM

please sightly remove the protective film before using the plastic bike mirrors on your bike,that will be clearer and safer while your riding

Product description

Have you lost your Reflex mirror or need another base for another helmet? Now available -- Reflex Replacement Parts Kit. The Reflex Replacement Parts Kit comes with: Easy on/off elliptical mirror Base to stick to helmet Adhesives Small socket

• 1 easy on elliptical mirror

Product description

Get a good look of what's coming up from behind on the open road or bike path with the sleek and ultralight BM-45 bar end mirror from Cateye. It easily attaches to both drop and flat bars with inner diameters between 16 and 25. 4mm with its included 3mm allen key, making it perfect for all bikes. Constructed of aluminum for durability and a 45mm glass lens for nearly distortion-free viewing, this bar end mirror will keep you safer and it weighs a feathery 35 grams. Its minimal projection from the bar keeps aesthetics clean and less likely to snag objects.

• STAY SAFE: Keep an eye on other cars and cyclists behind you without having to lose sight of the road ahead.
• SLEEK: With minimal projection, you don't have to sacrifice clean aesthetics for safety.
• CLEAR ROADS: The Bar End Mirror offers nearly distortion-free viewing so you can see the roads clearly and accurately.
• DURABLE: This aluminum and glass mirror will help keep you safe time and time again.
• FOR ALL BIKES: The Bar End Mirror fits both drop and flat handlebars.

User questions & answers

Question:	Will this fit Brompton M6R model
Answer:	Looking at the bike online, I expect this mirror should fit the Brompton handlebar. My concern would be that when the bike is folded, the mirror would be sticking out.
Question:	What is the lenth and size of the bolt? I need to replace my bolt as it has gotten stripped
Answer:	all you
Question:	does it come with only one mirror
Answer:	Yes, it comes with just the one mirror. The handle actually didn't fit in my bike's handlebar, so we had to shave off some of the sides to get it to fit properly. Just keep that in mind. Otherwise, happy with the purchase.
Question:	The inner diameter of my drop down bars is 7/8". Will this mirror work
Answer:	If you can get standard road style bar-tape and end plugs in, you can get this mirror in. I haven't measured the inner diameter on my bars, but they are Ritchey WCS drop road bars and it fits fine.

Product features

CatEye BM45 Bar End Bike Mirrors - Black

Our sleek new ultralight BM-45 bar end mirror easily attaches to drop and flat bars, making it perfect for all bikes. Constructed of aluminium and glass for durability and nearly distortion-free viewing, the BM-45 represent the height of handlebar mirror construction and design. Minimal projection from the bar means never having to sacrifice clean aesthetics for critical rear-view safety again.