Shimano Ultegra Di2 RD-R8150 12-Speed Rear Derailleur Bike Accessories_ Pegs Reactive Stretch Technology (RST): thinner

Reactive Stretch Technology (RST): thinner 2mm neoprene paired with the most flexible jersey liner around the back and shoulders produce greater mobility and reach from the shoulders

With a contour cut around the edges

On the bottom

Its high-performance moisture wicking fabric is made with yarns created from recycled plastic water bottles

hardened-steel races for longer life and less bearing drag

Shimano Ultegra Di2 RD-R8150 12-Speed Rear Derailleur Bike Accessories_ Pegs Reactive Stretch Technology (RST): thinnerCAGE LENGTH One Spec TOTAL CAPACITY 39T MAX FRONT DIFFERENCE 16 COLOR SERIES COLOR AVERAGE WEIGHT 262g MOUNT Direct attachment (conventional) NUMBER OF PULLEY TEETH 11 SERIES Ultegra GENERATION R8100 MAX LOW SPROCKET 34T MIN LOW SPROCKET 28T REAR SPEEDS 12