BOX One Folding Tire Size:20 x 1.75" The React S-Spec is finished

The React S-Spec is finished off with a Cylex 120 tpi casing and folding bead for additional weight savings

Durable hub shells with Onyx’s proven race technology

Crank arms found on some fitness equipment use nonstandard extractor threads and are not compatible with Park Tool crank pullers

Hope™ (non-BSA30) and others

Lightweight seat body composite material

BOX One Folding Tire Size:20 x 1.75" The React S-Spec is finishedBox One 120 TPI Folding Tires were engineered with a minimalist approach to hit lofty goals for weight, traction, rolling resistance, and rebound. At its heart is a super supple 120TPI casing where we forced in as much rubber displacing nylon as possible. Skin walls are employed to reduce drag and further reduce weight. We flanked the high density casing with a tightly packed hoop of aramid fibers. Finally, we draped this all with BMX race specific