Shimano Ultegra CS-R8101 Cassette

$130.00

Prices subject to change. How pricing works →

Cassette Ratio

In Stock Ships Immediately

SKU: ICSR810112130 Option: 11x30

Stock Availability by Location

RA Cycles Brooklyn In stock

105 5th Ave, Brooklyn, NY 11217718-636-5242

* Available for in-store pickup in 2-4 hours

RA Cycles Walnut Creek In stock

2099 Mt Diablo Blvd, Walnut Creek, CA 94596925-433-7099

* Available for in-store pickup in 2-4 hours

Distribution Center - East — Out of stock

Distribution Center - Central — Not immediately available

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Shimano Ultegra CS-R8101 Cassette Info

The Shimano Ultegra CS-R8101 Cassette brings 12-speed gearing to riders who want drivetrain performance without stepping up to Dura-Ace. Built with Hyperglide+ technology, it delivers faster, smoother shifts even when you're pushing hard on the pedals — a meaningful advantage on punchy climbs or during sustained efforts in a group.

Available in 11-30T and 11-34T range options, the CS-R8101 suits everything from flat road racing to hilly gran fondos. The 11-34T spread in particular gives you a genuine bail-out gear without sacrificing the tight steps at the top end where sprint and tempo riding happen. Compatibility with both 12-speed and road 11-speed freehub bodies means this cassette integrates cleanly into a range of wheel builds.

Shimano Ultegra CS-R8101 Cassette Specs at a Glance

  • Speeds: 12-speed
  • Available ratios: 11-30T, 11-34T
  • Technology: Hyperglide+
  • Freehub compatibility: 12-speed and road 11-speed freehub bodies
  • Series: Shimano Ultegra R8100

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