External Bottom Bracket style cranksets integrate the bottom bracket bearings, crank and spindle. The spindle is typically permanently attached to one arm of the crankset, and the opposite arm slides onto a splined spindle and is secured by a bolt. The main differences between external bearing style and earlier cartridge-style bottom brackets is that the bearings are located outside of the bottom bracket shell face (thus the External designation). Some examples of these systems are Shimano® Hollowtech II, Race Face® X-type Crankset, FSA® MegaEXO, and Truvativ® Giga X Pipe. Some of the newer press-fit style bottom bracket setups are also compatible with these cranksets, the determination being the distance between the BB cup faces vs the spindle length of the crankset, and the diameter of the crankset spindle.
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