Ultegra Cassette CS-R8100Description Shimano Ultegra CS R8100 is the road cassette for riders who want smooth, fast shifts under load and tight steps that keep cadence feeling natural. Built around Shimano Hyperglide+ shifting, it is designed to keep you moving cleanly through climbs, sprints, and steady pacing without that clunky pause between gears. This 11 30 option is a go to range for road racing and performance endurance riding when you want close ratios and predictable