CeramicSpeed Trek BB90 Bottom Bracket - SRAM GXP and Trek, Black Coated Bearing Apparel_Men's Cycling Bib Knickers Rear Derailleur: Shimano Acera or

Rear Derailleur: Shimano Acera or Microshift

thanks to the TYR Anti-Fog Spray

These cups thread into the BSA shell making it possible to install SRAM and Quarq 24/22mm spindle cranks

Foam base to protect the frame and reduce noise

CeramicSpeed Trek BB90 Bottom Bracket - SRAM GXP and Trek, Black Coated Bearing Apparel_Men's Cycling Bib Knickers Rear Derailleur: Shimano Acera orTrek 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