CeramicSpeed Trek BB90 Bottom Bracket - SRAM GXP and Trek, Black Coated Bearing Shimano Tiagra The Boa® IP1-S dial allows

The Boa® IP1-S dial allows you to microadjust your fit with the twist of a knob

Whether you're navigating busy city streets or riding in wet conditions

Water resistant seat padding

5mm wide and is designed to work with 24mm spindles and road cranks and have the bearings inside the shell

CeramicSpeed Trek BB90 Bottom Bracket - SRAM GXP and Trek, Black Coated Bearing Shimano Tiagra The Boa® IP1-S dial allowsTrek 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