Ultegra RX RD-R8150 Di2 12 Spd. Alivio this 303 wheelset maintains its

this 303 wheelset maintains its ideal-for-every-terrain 45mm rim depth but adds a significantly wider internal width to provide greater performance and ride quality in almost every measurable way

Pedal Body Material: Resin

drag is kept to a minimum in a range of head positions

Hypoallergenic seals

Ultegra RX RD-R8150 Di2 12 Spd. Alivio this 303 wheelset maintains itsNow 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. Our fastest ever rear shifting, 58% faster than RD R9150 Compact design