BB - common acronym for a Bottom Bracket
Task Summary
Shimano Hollowtech II
Campagnolo
SRAM
The external or outboard BB units that you will most commonly come across will be made by either manufacturers Campagnolo, Shimano Hollowtech II or SRAM. The steps taken to remove cranks for each of these units is essentially the same, with a few variations. There are lots of different brands of external/outboard BB though, and if you are faced with another type in the workshop, it is best to follow manufacturer instructions.
Campagnolo - The campagnolo Ultra Torque system integrates both spindle and bearings into the arms. The cups are installed without bearings and there is also a "wavy" washer - used to account for variations in frame shell width - on the left side cup.
SRAM - The spindle is a permanent press fit into the drive-side arm. No spacers are needed or required and the left arm has a one key release system which requires no puller for removal.
Shimano Hollowtech II - Like SRAM, the spindle is also permanently mounted on the crank arm.
Tools
Shimano Hollowtech II
Campagnolo Ultra Torque
SRAM
