NEW Shimano Ultegra CS-R8101 Cassette - 12-Speed, 11-34t, Silver Type_Cranksets Measure trainer at the widest

Measure trainer at the widest setting and measure the bike frame width at the rear hub

5mm 110mm BCD

2 WAY-RELEASE means shifts can be released by pull of the index finger or push of the thumb

Largest Cog: 48

NEW Shimano Ultegra CS-R8101 Cassette - 12-Speed, 11-34t, Silver Type_Cranksets Measure trainer at the widestThe uninterrupted shifting experience of the Shimano Ultegra CS R8100 12 speed cassette range lets you climb, sprint, or cruise without stopping to think about your next gear change. Larger driving cogs maximize drivetrain efficiency and create compatibility with both Shimano 11 and 12 speed freehub bodies. Shimano HYPERGLIDE+ technology is integrated to provide seamless shifts both up and down the gear range. Refined 12 step gear combination provides