The BB4129SR is just single roll but still strong enough. Designed with plastic sleeve for water proof, and our Patented Fusion Construction to reduce noise concern.
Premium Bearings are our high carbon steel bearings.
TOKEN’s X-Seal technology keeps bearings protected from dirt and water, with very little friction for a free-spinning bearing.
|Crank Type||SRAM DUB(dia.28.99)|
|Weight||90 g / set|