The Shimano 105 CS-R7101 brings 12-speed gearing to your road bike with a wide 11-34T spread, so you have a fast top gear for the flats and an easy bottom gear for the steepest climbs. It mounts on existing 11-speed HYPERGLIDE freehubs as well as the new 12-speed bodies, making it a straightforward upgrade for a lot of road wheelsets.

Highlights
  • Wide 11-34T range covers fast flats through to steep climbs
  • 12-speed gearing with closely spaced cogs for smoother cadence control
  • Fits both new 12-speed and existing road 11-speed freehub bodies
  • HYPERGLIDE tooth profiling and shift ramps for crisp, reliable shifts
  • Works with both mechanical and Di2 105 R7100 drivetrains
  • Hard-wearing nickel-plated finish in silver

Wide-range 12-speed gearing

The 11-34T spread runs 11-12-13-14-15-17-19-21-24-27-30-34T. The tightly stepped lower cogs keep your cadence steady at speed, while the 34T sprocket gives you a genuine bail-out gear for long or punchy climbs.

Smooth, dependable shifting

Shimano's HYPERGLIDE design uses specially positioned shift ramps and tooth profiles to guide the chain cleanly between cogs under load, so gear changes stay quick and quiet across the whole block.

Compatibility & fit

This is a 12-speed road cassette for the Shimano 105 R7100 series, compatible with both mechanical and Di2 systems. It fits the new 12-speed HG-Spline-L2 (HG-L2) freehub body and also mounts on a road 11-speed (HG-11) freehub body. Use it with a Shimano HG 12-speed chain.

Covered by Shimano's standard manufacturer warranty against defects in materials and workmanship. Normal wear is not covered. For any warranty support, return the item to Tune Cycles and we will manage the claim on your behalf.

  • Shimano 105 R7100 12-speed road cassette
  • 11-34T range: 11-12-13-14-15-17-19-21-24-27-30-34T
  • HYPERGLIDE shift ramps and tooth profiling for smooth shifting
  • Fits new 12-speed HG-Spline-L2 (HG-L2) and road 11-speed (HG-11) freehub bodies
  • Compatible with Shimano HG 12-speed chain
  • Suits both mechanical and Di2 105 R7100 drivetrains
  • Nickel-plated silver finish
  • Weight: 361g
SeriesShimano 105 (R7100)
Part codeCS-R7101-12
Speeds12-speed
Range11-34T
Sprocket combination11-12-13-14-15-17-19-21-24-27-30-34T
Freehub bodyHG-Spline-L2 (HG-L2); also fits road 11-speed (HG-11)
Chain compatibilityShimano HG 12-speed
Drivetrain compatibility105 R7100 mechanical and Di2
FinishNickel-plated, silver
Weight361g
SKU SHM-ICSR710112134
Barcode # 4550170822668
Brand Shimano