Shimano Ultegra 12-Speed CS-R8101 Hyperglide+ Road Cassette Sprocket Variant:11-30T As well as the standard

As well as the standard square body we chose nipples with a hex head so you can achieve precise tensioning

Weight:  735 g

(37-349) 16 x 1

Automatic Time Calibration Yes

IP67 Dustproof and waterproof

Shimano Ultegra 12-Speed CS-R8101 Hyperglide+ Road Cassette Sprocket Variant:11-30T As well as the standardSHIMANO ULTEGRA 12 speed HYPERGLIDE+ Road Cassette CS R8101 12 NEW The uninterrupted shifting experience of the ULTEGRA R8100 12 speed cassette range lets you climb, sprint, or cruise without stopping to think about your next gear change. Larger driving cogs maximize drivetrain efficiency and create compatibility with both Shimano 11 and 12 speed FREEHUB bodies. HYPERGLIDE+ cassettes revolutionized off road shifting with its seamless shifts both up