105 R7100 Di2 12 Speed Road Bike Groupset Size:172.5mm Crankset air loss is blocked and

air loss is blocked and a flat tire is prevented

more durable

Added protection against contaminants

Soothes already chafed or irritated skin

rounded edges at the spindle

105 R7100 Di2 12 Speed Road Bike Groupset Size:172.5mm Crankset air loss is blocked andThe new Shimano 105 Di2 brings electronic gearing to a more entry level market making it more affordable. Get huge benefits with smoother gear shifting, gear ratios made for all round riding, no more brake rub, and more. Shimano has refined many aspects of their groupsets over the years. Every new generation solves a wide range of issues from the previous generation. Shimano 105 Debut. The new Shimano 105 brings Di2 shifting to a new set of riders.