BOX ONE V-BRAKES Color:Silver 108mm both crank arms are hollow

both crank arms are hollow so they are super stiff

Press Fit bottom bracket 86 / 92mm

the R4 Race Collar can be worn on the track or trail with minimal distraction and maximum comfort

Lightweight 6061 alloy frame

Supple 120 TPI shaped casing allows for minimal ground contact when rolling in a straight line

BOX ONE V-BRAKES Color:Silver 108mm both crank arms are hollowDescription For Box braking weve limited the use of our Oversized Technology to the V area since the levers need to be minimalist and largely act as a remote for the V Brakes. To reduce lateral deflection at the V we chose to enlarge the pivot areas and arms while tightening tolerances at their interfaces. We robbed material from unloaded sections to reinforce these zones of high stress. Not only are you going to be more efficient with brake power