Ultegra RX RD-R8150 Di2 12 Spd. Alivio their increased size and redesigned

their increased size and redesigned shape means overall vent surface area has increased

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

Foam 90mm ball

- Leds: 1x Super-Bright Smt Led Designed To Provide Maximum Brightness For Duration Of Run Time

Ultegra RX RD-R8150 Di2 12 Spd. Alivio their increased size and redesignedNow 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