CeramicSpeed Trek BB90 Bottom Bracket - SRAM GXP and Trek, Black Coated Bearing Apparel Brand_Tifosi The result is an asymmetrical

The result is an asymmetrical shape

Flash Modes: Daytime Flash (900 Lumens): 50 hrs

HG-X11 special asymmetric plate design for 11-speed

Outsole Nylon

CeramicSpeed Trek BB90 Bottom Bracket - SRAM GXP and Trek, Black Coated Bearing Apparel Brand_Tifosi The result is an asymmetricalTrek developed their own bb standard to optimize their frame designs. BB90 has a 90. 5mm shell width and 37mm inner diameter and is designed so that the bearings of external cups can hide within the frame. The CeramicSpeed kit comes as two bearings, which are then pressed into the frame. Those two bearings consist of either CeramicSpeed Standard or Coated Bearings. Both features super smooth, super round CeramicSpeed balls rotating in hardened steel