SHIMANO Ultegra Cs-R8101 12-Speed Cassette Silver
- 12 speed road cassette
- 11-30T gearing
- 13.6 oz item weight
- Steel construction, silver finish
- Made in Japan
- Limited warranty
Updated 2 days ago · Based on the Amazon listing and published specifications, not hands-on testing.
A single close-ratio Ultegra cassette for riders upgrading a drivetrain that matches its speed count. Freehub fit is not listed, so compatibility needs checking.
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ASIN: B0DFK61Z84Model: ICSR810112130Category: Cassettes & Freewheels
Overview
Not a full drivetrain but one cassette, this Ultegra part adds an extra gear to the rear wheel to space the ratios closer together. Its steel build is described as made for abuse and long miles.
Close ratio steps and a steel construction promise smooth, durable shifting on long rides. The limitation is that the listing skips freehub and chain compatibility, so a buyer must match it to the existing system.
Who it's for
Riders with a matching Shimano group who need a smoother, closer set of gears will recognize the Ultegra line. Those on older drivetrains, or who need a complete groupset, should not buy a cassette on its own.
Pros and cons
- Close gear spacing
- Steel gears for durability
- Backed by Shimano warranty
- Freehub body fit not listed
- Chain and derailleur needs not listed
- Warranty terms not detailed
Performance notes
Extra cogs let each shift change the ratio by a smaller step, so cadence stays steadier on climbs and rolling roads. Steel cogs wear slowly under heavy use, which suits long rides.
Specifications
| Model | ICSR810112130 |
|---|---|
| Dimensions & fit | |
| Item Dimensions LxWxH | 3 x 6 x 6 inches |
| Size | 12-Speed |
| Item weight | 13.6 ounces |
| Construction & materials | |
| Color | Silver |
| Material | Steel |
| Warranty & support | |
| Warranty Description | Limited Warranty |
| Other details | |
| Number of Teeth | 11-30T |
| Style | Cassettes |
| Suggested Users | Unisex-Adult |
Closest rivals on specs
microSHIFT ADVENT Cassette- Item Weight 0.85 vs 0.77 pounds (+10%)
Shimano CS-M4100 Deore Cassette 10 Speed- Item Weight 0.85 vs 1 pounds (-15%)
Frequently asked questions
Is the Shimano Ultegra CS-R8101 cassette for 11 speed drivetrains?
No. It is a 12 speed cassette and is meant for 12 speed setups.
What gearing does the Shimano Ultegra CS-R8101 have?
The listing gives a range of 11-30T.