Shimano Ultegra CS-R8101 Cassette - 12-Speed | 11-30t
What Is the Shimano Ultegra CS-R8101 12-Speed Cassette and How Does It Differ From the R8000 Generation?
The CS-R8101 is Shimano's current 12-speed Ultegra cassette in an 11-30t configuration, designed for the R8100-series Ultegra Di2 groupset and compatible mechanical setups. The jump from 11 to 12 speeds tightens the gear steps across the entire range without reducing top-end or climbing coverage, meaning the 11-30t spread now has one additional cog that fills a gap in the mid-range where 11-speed cassettes required a larger jump between adjacent gears. The cassette uses Hyperglide+ bidirectional shifting technology, which Shimano developed at the Dura-Ace level and cascaded to Ultegra, enabling clean, fast upshifts and downshifts under load in both directions rather than requiring the rider to ease pedal pressure for rear shifts. A key compatibility upgrade from the R8000 generation is freehub flexibility: the CS-R8101 is designed with larger-diameter driving cogs that allow it to fit both Shimano 11-speed and 12-speed freehub bodies, eliminating the need to swap hub internals when upgrading from an 11-speed drivetrain.
The 11-30t range is the close-ratio option in the R8101 lineup, suited to flat to rolling road terrain where consistent gear steps across a narrow range support better cadence control than a wide-range cassette with larger cog jumps. The cassette fits standard Shimano road HG and the newer 12-speed freehub bodies and requires Shimano 12-speed road chains. It is designed to pair with the R8100-series Ultegra Di2 rear derailleur and shifters for the full performance benefit of bidirectional 12-speed shifting. For riders upgrading to the 12-speed Ultegra platform who want the tightest gear steps for road and criterium use, the CS-R8101 11-30t is the correct cassette spec.
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Shimano Ultegra CS-R8101 Cassette - 12-Speed | 11-30t
Shimano Ultegra CS-R8101 Cassette - 12-Speed | 11-30t
What Is the Shimano Ultegra CS-R8101 12-Speed Cassette and How Does It Differ From the R8000 Generation?
The CS-R8101 is Shimano's current 12-speed Ultegra cassette in an 11-30t configuration, designed for the R8100-series Ultegra Di2 groupset and compatible mechanical setups. The jump from 11 to 12 speeds tightens the gear steps across the entire range without reducing top-end or climbing coverage, meaning the 11-30t spread now has one additional cog that fills a gap in the mid-range where 11-speed cassettes required a larger jump between adjacent gears. The cassette uses Hyperglide+ bidirectional shifting technology, which Shimano developed at the Dura-Ace level and cascaded to Ultegra, enabling clean, fast upshifts and downshifts under load in both directions rather than requiring the rider to ease pedal pressure for rear shifts. A key compatibility upgrade from the R8000 generation is freehub flexibility: the CS-R8101 is designed with larger-diameter driving cogs that allow it to fit both Shimano 11-speed and 12-speed freehub bodies, eliminating the need to swap hub internals when upgrading from an 11-speed drivetrain.
The 11-30t range is the close-ratio option in the R8101 lineup, suited to flat to rolling road terrain where consistent gear steps across a narrow range support better cadence control than a wide-range cassette with larger cog jumps. The cassette fits standard Shimano road HG and the newer 12-speed freehub bodies and requires Shimano 12-speed road chains. It is designed to pair with the R8100-series Ultegra Di2 rear derailleur and shifters for the full performance benefit of bidirectional 12-speed shifting. For riders upgrading to the 12-speed Ultegra platform who want the tightest gear steps for road and criterium use, the CS-R8101 11-30t is the correct cassette spec.
Original: $117.99
-70%$117.99
$35.40Product Information
Product Information
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Shipping & Returns
Description
What Is the Shimano Ultegra CS-R8101 12-Speed Cassette and How Does It Differ From the R8000 Generation?
The CS-R8101 is Shimano's current 12-speed Ultegra cassette in an 11-30t configuration, designed for the R8100-series Ultegra Di2 groupset and compatible mechanical setups. The jump from 11 to 12 speeds tightens the gear steps across the entire range without reducing top-end or climbing coverage, meaning the 11-30t spread now has one additional cog that fills a gap in the mid-range where 11-speed cassettes required a larger jump between adjacent gears. The cassette uses Hyperglide+ bidirectional shifting technology, which Shimano developed at the Dura-Ace level and cascaded to Ultegra, enabling clean, fast upshifts and downshifts under load in both directions rather than requiring the rider to ease pedal pressure for rear shifts. A key compatibility upgrade from the R8000 generation is freehub flexibility: the CS-R8101 is designed with larger-diameter driving cogs that allow it to fit both Shimano 11-speed and 12-speed freehub bodies, eliminating the need to swap hub internals when upgrading from an 11-speed drivetrain.
The 11-30t range is the close-ratio option in the R8101 lineup, suited to flat to rolling road terrain where consistent gear steps across a narrow range support better cadence control than a wide-range cassette with larger cog jumps. The cassette fits standard Shimano road HG and the newer 12-speed freehub bodies and requires Shimano 12-speed road chains. It is designed to pair with the R8100-series Ultegra Di2 rear derailleur and shifters for the full performance benefit of bidirectional 12-speed shifting. For riders upgrading to the 12-speed Ultegra platform who want the tightest gear steps for road and criterium use, the CS-R8101 11-30t is the correct cassette spec.
