Built for modern race performance, the RD-R8150 keeps shifts crisp and reliable whether you’re climbing out of the saddle or putting down power in a sprint. Shimano also streamlines the Di2 experience by integrating key controls at the rear derailleur: check status via the LED indicator, pair and adjust, and charge the system right at the derailleur. The result is a sleek, high-performance electronic drivetrain with fewer complications.

Specifications (quick)

• Type: Electronic rear derailleur (Di2)

• Series: Shimano Ultegra R8100 Di2

• Speed: 12-speed (2x12)

• Max sprocket: 34T

• Cage: Single cage length

• Features: LED status/battery, pairing, adjustment mode, charging via derailleur