Shimano
CS-R8101 Ultegra Cassette
Best 12-speed upgrade for performance-focused road cyclists.
Elevate your cycling experience with the Shimano CS-R8101 Ultegra Cassette. Engineered for peak performance and unwavering reliability, this cassette delivers exceptionally smooth gear changes, ensuring efficient power transfer with every pedal stroke. Designed for 12-speed systems, it offers riders a choice between the 11-30t or 11-34t gearing options, allowing you to perfectly match your cassette to your preferred terrain and riding style. Experience the proven quality and precision that only Ultegra components can provide for your road bike.
$129.99
Owner Satisfaction
4.7
/ 5
Category Rank
68
/ 2100
#68 in Components
Price vs Category Average
+26%
Above average
Type
12
/ Speed
Who it's for
- High-mileage commuters wanting long-lasting components that resist wear
- Competitive cyclists needing seamless gear changes under high power
- Performance riders seeking weight savings without a pro-level price tag
Who should skip it
- Budget-conscious riders prioritizing value over marginal weight gains
- Cyclists using older wheelsets with standard 11-speed freehub bodies
- Weight-obsessed racers chasing every gram of performance
Performance breakdown
Shift Precision
Hyperglide+ technology ensures seamless gear transitions even under heavy pedaling loads.
Power Transfer
Rigid construction minimizes energy loss for maximum efficiency on steep climbs.
Durability
Hardened steel materials withstand high-torque output over thousands of road miles.
Weight Optimization
Lightweight design balances competitive performance with long-term structural integrity.
Gearing Versatility
Dual range options provide the perfect cadence for varied terrain profiles.
Compatibility
Seamlessly integrates with existing 12-speed Shimano road drivetrain ecosystems.
Key Specs
Type
12 Speed
Size Option 1
11-30t
Size Option 2
11-34t
Model Number
ICSR810112130
Target Gender
Unisex
Features
- 12-speed compatibility
- Smooth and reliable gear shifting
- Efficient power transfer
- Engineered for Ultegra quality
- Choice of 11-30t gearing
- Choice of 11-34t gearing
What customers say
The Shimano CS-R8101 Ultegra Cassette earns high praise for its exceptional shifting performance and reliable quality. Riders consistently note the smooth and precise transitions between gears, even under heavy effort, which enhances the overall riding experience. Its robust construction proves durable across various conditions, offering longevity for this critical drivetrain component. Many users feel the cassette delivers near professional grade functionality, representing excellent value compared to its cost. The quiet operation further contributes to a refined ride. Overall, customers are highly satisfied, confidently recommending this cassette for its dependable performance and superior craftsmanship in any 12-speed Ultegra system.
Know before you buy
No, this cassette is specifically engineered for Shimano 12-speed road systems. It will not function correctly with 11-speed derailleurs or shifters.
Choose the 11-30t if you prioritize tighter gear steps for maintaining a consistent cadence on flatter terrain. Opt for the 11-34t if you frequently tackle steep climbs and need a wider range of easier gears.
Yes, the CS-R8101 is designed for Shimano's HG L2 freehub standard. It is compatible with most 12-speed road wheels, but you should verify your wheelset's freehub compatibility before installation.
Yes, you must use a 12-speed specific chain to ensure proper engagement with the cassette teeth. Using an older 11-speed chain will result in poor shifting performance and potential drivetrain damage.
Yes, this cassette is fully compatible with Shimano's 12-speed Di2 electronic road groupsets. It is designed to provide the precise, seamless shifting performance expected from the Ultegra line.
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