Park Tool BBT-27.3 Bottom Bracket Tool size-16mm The Onyx Pro Rear ISO

The Onyx Pro Rear ISO Rear Hub at J&R Bicycles comes standard with ceramic hybrid bearings

The quick-release seat clamp makes switching out your racing components quick and easy

Compatible with most square taper crank systems with a 5/8" square mounting boss

Optimized for BMX Race 451mm ETRTO size wheel builds

Weight: 289 g / 10

Park Tool BBT-27.3 Bottom Bracket Tool size-16mm The Onyx Pro Rear ISOThe Park Tool BBT 27. 3 Bottom Bracket Tool at J&R Bicycles is built to install and remove threaded bottom brackets made with 16 notch tool fittings. Made from high quality aluminum alloy that has been CNC machined for added durability, the BBT 47 12 is compatible with many popular bottom brackets like the FSA MegaEvo, Wheels Manufacturing T47, and Wheels Manufacturing PF30 just to name a few. This tool will work with 16 notch threaded bottom brackets