Updated: Fox Duncan Sport sunglasses review

Quality mountain bike eyewear

Our rating 
4.0 out of 5 star rating 4.0
GBP £130.00 RRP

Our review

Winning combination of Oakley technology and Fox styling, but with a premium pricetag to match
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The Duncan Sport is Fox’s first foray into the world of riding glasses. With their chunky arms and squared-off lenses, these shades take styling cues from Fox’s Duncan casual sunnies, but add a choice of lenses and a hint of Eighties style (if that’s not an oxymoron), especially in the lurid pink colour option.


The look is vaguely reminiscent of Oakley’s classic Razor Blade, and that’s no accident – Fox’s glasses range is the result of a collaboration with the Big O, and the Duncan Sport’s O-Matter frame and High Definition Optics lenses are both manufactured by them.

As you’d expect, lens quality is peerless. It’s sometimes difficult to justify the price of premium sunglasses, but try a pair of these next to some budget cycling shades and you’ll really notice the difference.

The large Plutonite polycarbonate lens provides great coverage, blocking out light from the sides and below, with Iridium and Hydrophobic coatings to reduce glare and repel water and smudges. On the trail, the lack of distortion is immediately noticeable, with a crisp, clear view of upcoming obstacles.

Fogging wasn’t an issue during testing thanks to ample airflow, but we’ve yet to put them to the test on a really wet ride. Although not super-light (they weigh 29g), they’re comfortable from the start and have a quality feel, with ‘Unobtanium’ ear and nose grippers providing a secure fit. 

The glasses are on the large side so may not suit those with smaller faces. They’ve fitted with all the helmets we’ve tried them with. A bulky but protective ‘Soft Vault’ hard case is included, with room to store a spare lens (not supplied). A range of different frame colours and lens tints is available.

The version tested here is model #59891, with ‘Carbon Fiber’ frame graphics – which, it has to be said, didn’t meet with universal approval in the BikeRadar office – and salmon-pink G30 lens, which is a good compromise for most weather conditions. 


Of course, Oakley technology doesn’t come cheap – prices range from £120-£160 depending on which lens you go for – but if you’ve got the cash, this is a well thought out pair of glasses with market-leading optics and a dose of Fox style instead of the usual super-tech look.

Product Specifications


Name The Duncan Sport sunglasses (10) - (Carbon Fiber/G30 Black Iridium)
Brand Fox

Sunglasses Type Replaceable Lens
Prescription Compatible No