The PF4130 bottom bracket is Press Fit into 41mm diameter shells that are 86.5mm wide and mate most cranks with a 30mm spindle to that standard. If you have a BB86 frame and want to install a 386EVO crank or Rotor 30mm crank, this is the kit you need. Features: Grade 3 Silicon Nitride balls Hardened races Reinforced polyamide cage and non-contact seals Hand built in Denmark 4 year warranty Specifications: Frame Interface: BB86 Spindle Interface: 386 Evo, 30mm Spindle Bottom Bracket Shell ID: 41 Shell Width: 86mm Bearings: Ceramic Color: Black Weight: -