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- Rear cassette hub
- Shimano FH-6600 "Ultegra"
- Aluminum
- 9-speed
- Quick-release
- 130mm width
- Borozon treated cone races with stainless steel ball bearings
- Hollow steel axles with larger hub shell cross section
- Steel freehub body that is 8-10 speed compatible
- Standard drilling
- 24-hole
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