Shimano 105 Di2 ST-R7170 / BR-R7170 Hydraulic Disc STI Shifter / Caliper - Right Select Option:Right Rear (1700mm) Compatible with standard HG cassette

Compatible with standard HG cassette hub bodies

SRAM SX PG-1210 12 Speed Cassette - 11-50T

Genuine Corratec replacement part

Material: Lightweight aluminium calliper design with tough anodised finish

Shimano 105 Di2 ST-R7170 / BR-R7170 Hydraulic Disc STI Shifter / Caliper - Right Select Option:Right Rear (1700mm) Compatible with standard HG cassetteShimano 105 Di2 ST R7170 BR R7170 Hydraulic Disc STI Shifter Caliper Right Shimanos latest electronic Di2 105 shifters communicate wirelessly with the frames derailleur and battery system, making fitting easier and the front end cleaner. Although the levers are in exactly the same place as with the mechanical STI units, all that is needed to switch chainrings is a light press on the lever for an instant change. When a different sprocket is selected at