Bontrager XR4 27.5×2.35in MTB tyre review

Outstanding and affordable mountain bike rubber

Our rating 
4.5 out of 5 star rating 4.5
GBP £40.00 RRP | AUD $90.00 | USD $75.00
Bontrager's XR4 tyres have continued to impress our testers

Our review

Cost-effective durability and decent rolling speed with good all-round grip
Buy if, You want a superb, good value all-rounder that won't let you down
Pros: Secure fit, low-pressure performance, outstanding grip
Cons: Take a bit of wrestling onto the rim
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These flagship tyres from Trek’s component sub-brand are top performers in a wide range of trail conditions.


Once you’ve wrestled the relatively tight beads onto the rim, the XR4 (and all of Bontrager’s other tyres) bang into place very positively and securely once you get track-pumping.

Carcass size is ample for a 2.35in tyre and it’s taller than most so there’s a good depth of air cushioning between rim and trail. The Inner Strength sidewall protection doesn’t feel particularly tough or stable when you’re fitting it, but the XR4 handles low pressures really well with no crumpling or roll even when you’re turning in very aggressively on high-grip rock surfaces.

We’ve scored them highly in the past, but returning to these tyres the overall performance of the wide-spaced, but sloped and siped tread was still a revelation.

Whether we were flicking from berm to berm, carving fresh loam or flat-out across wet, off-camber root spreads, the XR4s stayed outstandingly surefooted and predictable, often letting us turn in tighter mid-corner than we dared hope on entry. They roll quickly enough to leave on all year and wear life is good, confirming their performance credentials.


[Editor’s note: Bontrager recently overhauled the XR4 with a new tread pattern. Stay tuned for an updated review.]

Product Specifications


Name XR4 Team Issue 27.5x2.35
Brand Bontrager

Weight 810