Rennen Ultralite Hydrogen Bottom Bracket Spindle Length:110mm Moderately padded with nylon anti-abrasion

Moderately padded with nylon anti-abrasion outer skin

20 x 1-3/8 and 20 x 1-1/8 Sizes Coming Soon

Weightless Minimal Design

Go from local tracks to Nationals to SX

Rennen Ultralite Hydrogen Bottom Bracket Spindle Length:110mm Moderately padded with nylon anti-abrasionRennen 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