Ultegra Di2 RD-R8150 12 Spd. GRX Di2 Improved imprinting of numbers to

Improved imprinting of numbers to reduce wearing

air-dry away from heat sources

Multiple bolt placement along bracket for multi-saddle compatibilty

The Ergo Grip 2 outsole features removable studs designed to maximize mud clearance and give great grip when you dismount while the offset hook and loop fastener straps provide excellent support to your heel

long runtimes

Ultegra Di2 RD-R8150 12 Spd. GRX Di2 Improved imprinting of numbers toNow simplified with a single derailleur cage length, the new 12 speed Shimano ULTEGRA R8150 rear derailleur packs our fastest, most precise shifting into a more approachable option. With our fastest, most accurate shifting, the new 12 speed ULTEGRA R8150 rear derailleur is more versatile than ever thanks to a single cage length option that is compatible with 28 34T low sprockets. FEATURES Our fastest ever rear shifting, 58% faster than RD R9150Compact