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Koo Billy sunglasses mount



A useful, if expensive, accessory for mounting your sunglasses while you ride
Works with any sunglasses
A bit of technique required to attaching glasses on the move

At every product is thoroughly tested for as long as it takes to get a proper insight into how well it works. Our reviewers are experienced cyclists that we trust to be objective. While we strive to ensure that opinions expressed are backed up by facts, reviews are by their nature an informed opinion, not a definitive verdict. We don't intentionally try to break anything (except locks) but we do try to look for weak points in any design. The overall score is not just an average of the other scores: it reflects both a product's function and value – with value determined by how a product compares with items of similar spec, quality, and price.

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The Koo Billy sunglasses mount is a neat way to attach your glasses to your bike mid-ride, when they're not in use. It's very light, unobtrusive, and makes easy work of the task. It's the ideal alternative to stowing glasses in your helmet, though it is a bit pricey for what it is.

Disclaimer: I'm not a pop-your-sunglasses-in-your-helmet-as-you-ride kind of guy. I don't know what it is; maybe I'm clumsy, worried about breaking my glasses, or I just haven't tried hard enough, but it's definitely not for me. Luckily, Koo – whose cycling sunnies we've reviewed on – has come up with this neat little mount that fits to your handlebar and allows you to conveniently snap your frames into place as you ride.

> Buy this online here

Unlike when you place your glasses in your helmet – because you can see the mount in front of you, you know it's actually locking into place. So, no fretting about dropping your £200 sunnies any more.

The mount itself is pretty basic – there's the plastic clasp which the glasses snap into, a rubber spacer that goes underneath, and a variety of rubber o-rings to attach it. I found the o-rings slightly on the small side, so even using the larger of the two included in the box meant it was a really tight fit, but that's probably a good thing as it keeps the mount nice and secure.

 2021 Koo Billy glasses mount_5.JPG

The whole thing weighs just 4g, so there's no reason not to keep it attached at all times. It might not be aero, but unless you're racing, who cares?

The Billy is designed to be fitted to your stem or your bar – you choose. I preferred mounting it to the stem as it seemed slightly safer than the handlebar, simply because I don't like the idea of exerting pressure on the bar while riding at speed. You can get it to work even if you have a computer or light mounted to your stem or bars.

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Attaching your sunglasses to the mount while you're riding does take a bit of getting used to. The plastic tabs where the glasses attach are quite stiff, so you need to apply a bit of pressure to get your frame to snap into place – I found that you have to hold your glasses by the nose bridge rather than the sides, to be able to apply enough force. After a few attempts it does become easier.


Once attached, the glasses are held in place very securely and there's no rattling or any worrying movement over bumpy surfaces. The only thing I would suggest to Koo with the next iteration is adding a small strip of grippy rubber inside the clasp, as my sweat-drenched sunglasses tended to slip inside the mount just slightly off-centre when I was climbing out of the saddle. That's me being a bit OCD, though.

 2021 Koo Billy glasses mount.JPG

When you want to remove your sunglasses from the mount, you just pull up on them and they detach easily.

> Buyer’s Guide: 31 of the best cycling sunglasses

Koo says the Billy works with all types of framed sunglasses, and I had no trouble attaching non-Koo glasses; if you own sunglasses without a frame at the top, such as the Oakley Flight Jacket or Rapha's Pro Team Frameless Glasses, it won't work as there's not enough for the mount to bite into (and I guess you might scratch the lens trying).

 2021 Koo Billy glasses mount_upclose.JPG

I can see why some might see the Koo Billy as a bit niche – more so if you already have a good method of putting your glasses to one side while you ride – but to my mind it's a great addition. It's not cheap for what is essentially plastic and silicone, but I'd say it's a worthwhile investment, especially if you have a pricey pair of sunglasses.


A useful, if expensive, accessory for mounting your sunglasses while you ride test report

Make and model: Koo Billy sunglasses mount

Size tested: Compatible with all framed sunglasses

Tell us what the product is for and who it's aimed at. What do the manufacturers say about it? How does that compare to your own feelings about it?

Koo says: "The BILLY is a sport performance eyewear mount for your bicycle, that offer a practical and secure place for your sunglasses when unused; the BILLY makes accessing your eyewear easy, and you no longer have to fumble around trying to find your sunglasses stowed on your helmet, or in a pocket. The BILLY does not interfere with the other devices installed on the bicycle, such as a power meter or computer. The BILLY is compatible with full-framed sport performance sunglasses. The BILLY is a great eyewear accessory to utilize when going uphill and at low speeds and you can pedal without having to protect your eyes from foreign objects, foul weather, or sweat droplets. The BILLY is suitable for Road and Triathlon use."

Tell us some more about the technical aspects of the product?

Koo lists these features:

- Compatible with all framed sunglasses

- Practical and secure

- Quick to install and remove

-Lightweight (4gms)

- Suitable for Road and Triathlon use

Rate the product for quality of construction:
Rate the product for performance:

Some rubber on the inside of the clasp would stop sweat-covered glasses from slipping off centre when you're climbing out of the saddle.

Rate the product for durability:

Only time will tell how long the plastic clasp will last over repeated use.

Rate the product for weight (if applicable)
Rate the product for value:

Not cheap for a bit of plastic and silicone, but no rivals to compare.

Tell us how the product performed overall when used for its designed purpose

The Koo Billy worked very well. Attaching sunglasses takes a bit of getting used to, and there's definitely a bit of a technique required, but detaching them is very easy. Glasses remain securely in place, even over rough stuff.

Tell us what you particularly liked about the product

Being able to take your glasses on and off and store them within easy reach.

Tell us what you particularly disliked about the product

That your sunglasses can slip slightly off centre when you're sprinting aggressively, or climbing out of the saddle.

How does the price compare to that of similar products in the market, including ones recently tested on

Nothing to compare these to as we've never reviewed anything like it. But it's not cheap for what it is, any way. you look at it.

Did you enjoy using the product? Yes

Would you consider buying the product? Yes

Would you recommend the product to a friend? Yes

Use this box to explain your overall score

If you like having your sunglasses within easy reach and you want them securely stored, the Billy mount is ideal. It's a bit pricey for what it is, but I now consider it essential; more so if you have pricey sunglasses you don't want to get damaged.

Overall rating: 8/10

About the tester

Age: 39  Height: 6'4  Weight: 175lbs

I usually ride: Steel audax bike  My best bike is:

I've been riding for: 10-20 years  I ride: Every day  I would class myself as: Experienced

I regularly do the following types of riding: commuting, touring, club rides, sportives,

Add new comment


mdavidford | 3 years ago
1 like

If you really must, you could at least fold the arms in.

KiwiMike replied to mdavidford | 3 years ago

Not aero when folded. 

Yorky-M | 3 years ago

Brought to you by the company that brought you the little legs to hold your bars when your bike is upside down...from the people behind metal tyre levers with carbon rims and from the marketing company that intices 130kg dentists to buy 6kg r'acing' bikes we bring you the .....


Cupov | 3 years ago

Just had to check the date as I read this review. This is up there with indicators as the most useless bike accessory.

Cyclecynic replied to Cupov | 3 years ago

One of these or 5 new (useful) inner tubes?

i know what I would chose

KiwiMike replied to Cupov | 3 years ago

Man, you're going to be really upset when you find out about the millions of other products you don't see a need for. 

Truffl3Shuffl3 replied to KiwiMike | 3 years ago

I really don't see the issue with this product (other than the price). Glasses are the one thing that I'm always struggling to put somewhere when I take them off (mid ride, or when I've stopped for a break). This solves that problem. I understand it's not for everyone, though.

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