Rennen Ultralite Hydrogen Bottom Bracket Street Park Dir but can also be used

but can also be used with a traditional Pivotal seat

Investment cast 1pc drop outs for maximum strength

Built to withstand the demands of street and park riding

MATERIAL: CNC machined from 7075-T6 aluminum in the USA

Rennen Ultralite Hydrogen Bottom Bracket Street Park Dir but can also be usedRennen takes their commitment to BMX racing technology seriously and with the Rennen Ultralite Hydrogen Bottom Bracket at J&R Bicycles this is obvious. Engineered to be the lightest and smallest BB on the market, Rennen went even further and made this BB adjustable. Easily installed with special tools (included), once it is set up you'll be able to easily make precise adjustments to the chainline. Loaded with features, this BB uses Silicon Nitride