Shimano 105 CS-R7101-12 12Speed 11-34T

The New Standard.

Elevate your climbing and refine your cadence. The Shimano 105 R7101 cassette brings 12Speed performance to the masses, offering a "sweet spot" gear range that ensures you’re never hunting for the right gear. Whether you’re grinding up the steepest pitch in the Escarpment or sprinting for a city limit sign.

Why It’s the Ultimate Upgrade:

• Seamless 12Speed Steps: The addition of the 12th cog allowed Shimano to optimize "the gap." You get smoother transitions between gears, helping you maintain a consistent cadence and save energy on long solo pulls.

• Hyperglide+ Technology: Inherited from Shimano’s top-tier groupsets, the tooth profiles are engineered for "shifting under load." You can click through gears while climbing out of the saddle with confidence and zero hesitation.

• Versatile 11-34T Range: This is the "do-it-all" ratio. The 11T small cog provides plenty of top-end speed for descents, while the 34T "rescue gear" makes even the most daunting climbs feel manageable.

• Backwards Compatible: Brilliant engineering means this 12Speed cassette fits on your existing Shimano 11Speed road freehub bodies. You get the extra gear without needing to buy a new wheelset.

• Built to Last: Constructed with high-quality steel cogs and an aluminum spider, it’s designed to handle the high-torque demands of modern riding (and even E-Road bikes) while remaining surprisingly light.

Technical Specs:

• Speed: 12Speed

• Combination: 11-12-13-14-15-17-19-21-24-27-30-34T

• Compatibility: Shimano HG L2 / HG 11Speed freehub bodies

• Recommended Chain: Shimano M7100 / M8100 / M9100 12Speed

• Weight: ~361g

The Alegro Build Tip: This is the gear range we'd spec on most of our FiftyOne Sika performance builds. It offers the reliability of 105 with a gear range that makes it a true "all-road" contender.

Refine your ride. Experience the precision of 12Speed 105.