The American Classic ISIS bottom bracket is light because of the unique split ring design (patent applied). The new and improved split ring and cups support the bearings and keep them in place. The bottom bracket axle is designed to distribute the stress loads applied when riding. It features:
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Split Ring design allows for non shouldered bearing retention
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Uses replaceable, full complement bearings (21531): 21.5x31x7mm
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Installs with 8 notch, Truvativ or Park (BBT-8) ISIS tools
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M15 crank arm mounting bolts not included
- Sizes:
- 108mm (68mm Shell)
- 113mm (68/73mm Shell)
- 118mm (68/73mm Shell)
- English thread
- Weight: 153 grams
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