Reynolds TR 309 29 Boost Wheelset

Built to bridge cross-country speed with real trail durability, the Reynolds TR 309 29 Boost Wheelset gives mountain riders a carbon wheel that doesn't demand a premium-tier price to get there. It sits below the TR 309S in Reynolds' lineup, trading a small amount of refinement for a noticeably lower cost while keeping the core construction that makes a Reynolds carbon wheel worth running in the first place.

The rim is built from a layup of five different carbon fiber types spread across different zones of the wheel, a construction approach aimed at putting strength where the rim needs it without piling on extra weight. The rim shape is asymmetric, which evens out spoke tension between the two sides of the wheel — a detail that translates into a stiffer, more durable build and a more consistent ride feel than a symmetric rim of similar weight. At a 26mm rim depth with a 30mm internal and 36mm external width, the profile stays wide enough to support a broad range of trail tire widths while keeping weight in check. The rim is tubeless-ready and hookless, a combination that makes seating tires easier and adds resistance to pinch flats and punches from square-edged trail hits.

Underneath, the wheelset runs Reynolds' TR3 Mountain Hub, machined entirely on CNC equipment rather than cast, with a 10-degree engagement angle driven by a 3-pawl freehub. That quick engagement matters most in technical terrain, where a rider needs power to reach the rear wheel the instant they resume pedaling out of a switchback or over a root section, not a half-turn later. Boost spacing widens the hub flanges front and rear, which increases torsional stiffness and helps the wheel track straighter and resist flex under hard cornering loads. The hub ships compatible with Shimano 9-11 speed or SRAM XD freehub bodies, and the center lock disc brake interface keeps rotor swaps simple while spreading braking heat more evenly than a six-bolt mount.

At 1,755 grams for the pair, the TR 309 29 Boost sits in the range where a wheel still feels quick to accelerate and spin up but has enough structure underneath to hold up to sustained trail riding rather than just groomed singletrack. Twenty-eight spokes front and rear give the build a straightforward, serviceable spoke count that's easy for a shop to true and repair if something does go wrong out on the trail. That balance — carbon-wheel speed without a carbon-wheel weight penalty or a fragile ride — is the wheelset's real selling point relative to its price.

This is a wheelset for a rider who wants the responsiveness of a lighter carbon build but plans to actually use it across a full range of trail terrain, from faster cross-country loops to longer days where durability matters as much as weight. For anyone upgrading from an alloy wheelset or looking for a carbon option that doesn't require babying, the TR 309 29 Boost delivers a well-built, race-capable foundation at a price that undercuts most of the carbon mountain wheel category.