"Mud, grease, wet roots, hard packed, leaf covered, you name it—these XR4s stick to everything and always tempt me to push harder and harder"

"They roll quickly, are predictable, brake well, provide excellent hold off-camber and are a reasonable weight with ample protection"

"One of our favorites...Excellent, stable but smooth ride feel, trustworthy all-conditions grip and reasonable roll"

"They’ve held up well, excelled in some of the sloppiest conditions I’ve ever ridden in and been both predictable and reliable in all situations"

Get all your favorite apparel from over 80 of the world's best cycling brands delivered right to your doorstep or local Trek retailer when you shop our curated online collection. If you're not 100% satisfied, you can return your purchase within 30 days for a full refund.

Flats happen, learn how to change your tube quickly so you can get back rolling.

Setting your bike’s tire pressure correctly will give you a more comfortable ride with better grip and handling. Learn how.

Trek is committed to changing the world by getting more people on bikes, and it starts with sending kids down the right trail. We’ve pledged $1 for every MTB tire sold, totaling over $1 million in support to the National Interscholastic Cycling Association, the governing body for middle- and high-school mountain biking in the US.