Shimano Dura-Ace CS-R9100 11-speed 11-28T cassette.

All Dura Ace R9100 cassettes feature smooth but reliable gear changes

Specifications

• Range of use: Road
• Gear ratios: 11-speed
• Gradiations 11-28Z
• Freewheel compatibility: 11-speed Shimano Road 
• Pinion material: Steel (sprockets 1-6), Titanium (sprockets 7-11)

Features

• light weight
• "Rider Tuned" gradation
• HG-EV cassette
• weight: 11-28 : 193 g
• color; silver

HG-EV

The HG-EV cassette is used for rider-tuned gradation and cadence management. Shimano offers the optimal gear ratio for 11-speed shifting systems. You can choose wider or tighter ratios to suit your needs. With the HG-EV cassette, you get an 11-speed shifting system without compromising on robustness and improved Hyperglide shifting.