HOLLOWGLIDE Outer Ring

A high-rigidity hollow structure on the outer chainring cuts weight without sacrificing strength. The result is better power transfer and quicker, more precise front shifting — the kind Ultegra has been famous for across generations.

HOLLOWTECH II Bottom Bracket

Integrating the bottom bracket axle into the right crankarm gives you more stiffness, less weight, and outboard bearings that spread load wider for improved pedalling stability and power transfer on every stroke.

Hollow Forged Crank Arms

Shimano's proprietary HOLLOWTECH forging creates a hollow arm that performs like solid — maximum rigidity with minimum rotating mass. Less weight on the crankarms means quicker acceleration and less fatigue over long rides.

Five Crank Lengths

160, 165, 170, 172.5, and 175mm in one product line. Shorter cranks reduce hip restriction, open up aero positions, and improve clearance for riders with shorter femur lengths or high saddle heights — previously rare at this component tier.

Two Ring Combos

Choose 50-34T (compact — ideal for climbing, endurance, and varied terrain) or 52-36T (mid-compact — suited to racing, sportive riding, and flatter courses). Both combos are available across all crank lengths.

Dura-Ace Performance, Ultegra Price

The R8100 shares front shifting architecture with the Dura-Ace R9200, including the HOLLOWGLIDE ring structure and HOLLOWTECH II bearing system. You get race-calibre drivetrain feel without the top-tier price premium.