Reynolds TR 307 S 27.5 Wheelset

$1,699⁹⁹

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Color

Black

Compatibility

Shimano XD Driver

The Reynolds TR 307 S 27.5 Wheelset typically ships in 5-8 business days

Reynolds | SKU: 78701 | Option: Black, Shimano

This product is HSA / FSA eligible

Pickup available at RA Cycles - Brooklyn

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Reynolds TR 307 S 27.5 Wheelset Info

The Reynolds TR 307 S 27.5 Wheelset is a carbon mountain bike wheelset built for riders who want the nimble, quick-turning character of a 27.5-inch wheel without giving up stiffness or durability. At 1,560 grams for the pair, the TR 307 S sits in carbon mountain wheel territory where weight, strength, and ride feel all have to be balanced against each other, and Reynolds leans on an asymmetric rim design to do some of that balancing. The rims use an offset spoke bed that evens out spoke tension between the drive and non-drive sides of the wheel — a detail that matters more on the rear wheel of a mountain bike, where cassette and disc rotor placement naturally pull tension unevenly across a standard rim.

Rim dimensions are built around modern trail tire volume: a 30mm internal width and 36mm external width give a wide, supportive base for bigger-volume 27.5-inch tires, while a 26mm rim depth keeps the wheel low and stable rather than aero-oriented. The bead is tubeless-ready and hooked rather than hookless, which Reynolds uses to simplify tubeless setup and inflation while helping guard against pinch flats and punctures on rocky, technical terrain. The carbon layup behind the rim is built specifically for mountain use — this isn't a road rim adapted to a bigger diameter, but a rim shaped and laid up around the impact loads a 27.5-inch trail wheel actually sees.

Reynolds builds the TR 307 S around its own TR6 Mountain Hub rather than an outsourced unit. The hub is fully machined, uses a 6-pawl freehub design, and engages at 5 degrees of rotation — a tight engagement window that matters on technical climbs and tight switchbacks, where a rider needs power to transfer the moment they start pedaling rather than a few degrees later. This build ships through RA Cycles with a choice of Shimano 9-11 speed or SRAM XD freehub bodies, so it can be matched to most modern mountain drivetrains without needing a separate freehub swap.

The wheelset uses a relatively low 28-spoke count front and rear, which keeps weight down while leaning on the rim's asymmetric design and the carbon layup to hold stiffness under load — a build philosophy that trades raw spoke count for a lighter, more purpose-built structure. Braking runs through a Center Lock disc interface on both wheels, and the hubs are spaced for 15x100mm up front and 12x142mm at the rear, standard mountain thru-axle spacing that covers the large majority of current trail and enduro-oriented 27.5-inch frames and forks.

This wheelset is built for a rider who's already committed to 27.5-inch wheels for their quicker handling and wants a carbon upgrade that holds up to rocks, roots, and rough trail impacts rather than folding under them. It ships in a Black colorway and is available through RA Cycles with either Shimano or SRAM XD freehub compatibility at $1,699.99. For a rider who values a wheel that responds instantly out of a corner or off a climb, and who's harder on gear than the average road rider, the TR6 hub's tight engagement and the rim's impact-oriented carbon layup make the case for this wheelset over a lighter but less trail-focused option.

The RA Perspective

We like the TR 307 S for customers who've already decided 27.5-inch wheels suit how they ride and just want a carbon upgrade that won't fold the first time it clips a rock garden wrong. The asymmetric rim design is a real feature here, not just marketing language — it's a meaningful way to even out spoke tension on the rear wheel specifically, and we've found these hold true longer between tensioning checks than a lot of symmetric rims at this price.

The tight 5-degree hub engagement is the detail riders notice fastest, especially on technical climbs where you're pedaling through awkward, low-cadence moments. It's a genuinely different feel from a hub with a wider engagement window.

One honest note: this build only ships in Black through RA Cycles, so if colorway matters to a customer, it's worth setting that expectation before they order. The 28-spoke count front and rear is also lower than some riders expect from a mountain wheel at this price — it's a deliberate weight-saving choice that leans on the rim and hub design to compensate, and it's worked well in wheels we've built up, but it's worth mentioning to a rider who associates spoke count directly with durability.

This is the wheelset we'd point an aggressive trail or light enduro rider toward, more than someone doing mellow XC miles who might not need the impact-oriented layup.