Rennen Ultralite Hydrogen Bottom Bracket gear-size-39-9t Designed with eye drop cutouts

Designed with eye drop cutouts to conserve weight and create the coolest gear on the market

Constructed from CNC machined aluminum

5" rise and 29" width

Adjustable waist belt for a custom fit

Adjustable rear strut for a customized fit

Rennen Ultralite Hydrogen Bottom Bracket gear-size-39-9t Designed with eye drop cutoutsRennen 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