Reynolds TR 307 S 27.5 Boost Wheelset

The Reynolds TR 307 S 27.5 Boost Wheelset gives trail and aggressive XC riders a carbon wheelset built around a 27.5-inch platform, sized for riders who want the quicker handling and snappier acceleration a smaller wheel offers on tight, technical trails. At 1,560 grams for the pair, it's light enough to notice on climbs without feeling fragile on the way back down.

Reynolds builds the rim with a low-profile, asymmetric design, offsetting the rim bed relative to the hub flanges so spoke tension balances more evenly between the left and right sides of the wheel. That translates into a stiffer, more reliable build that holds true longer under hard cornering loads, and a more direct transfer of power from pedal stroke to trail. At 26mm deep with a 30mm internal and 36mm external width, the rim gives riders room to run wider tubeless tires for extra volume and a lower risk of pinch flats, without ballooning the tire's profile past the rim's edge.

Power gets to the ground through a Reynolds TR6 mountain hub, a 100 percent machined hub with 5-degree engagement and a 6-pawl freehub, quick enough to matter when you need instant response out of a tight switchback or a stalled-out climb. Boost spacing, 15x100mm up front and 12x142mm in the rear, sets the hub flanges wider than standard spacing, which increases both lateral and torsional stiffness across the wheel and helps it hold a line under hard, off-camber loads. The wheelset ships with a Center Lock disc interface and a spoke count of 28 front and 28 rear, and is available with a Shimano, SRAM XD, or Microspline freehub body to match your drivetrain.

Reynolds backs every carbon rim it builds with a lifetime warranty to the original owner, a guarantee the brand can make because its wheels are produced in-house, by its own staff, to its own engineering specifications rather than outsourced to a third-party rim supplier. That matters on a wheelset built for rowdy lines and rock gardens, where a rim is going to take real hits over its lifespan. For a rider who wants a genuinely light, stiff carbon wheelset on 27.5-inch wheels, without stepping up to Reynolds' top-tier Blacklabel builds, the TR 307 S is a well-built, reasonably priced way into carbon on the trail.