For SPD-SL

Speed 1x11 speed

offering excellent grip even on unpredictable terrain

Its dual-sided measurement is accurate within 2

this component elevates your bike's shifting responsiveness and overall ride quality

shimano ultegra rear derailleur di2 spec rd r8150 12 speed sale40 For SPD-SLSHIMANO ULTEGRA Rear Derailleur Di2 RD R8150 12 speed Fastest ever rear shifting, 58% faster than RD R9150 Compact design includes an integrated wireless unit, charger, and switch LED status indicator Battery indicator Pairing Adjust mode, etc. Wider range capacity Max. low sprocket: 34T Product Description With the fastest, most accurate shifting, the new 12 speed ULTEGRA R8150 rear derailleur is more versatile than ever thanks to a single cage