Shimano 105 RD-R7150 Di2 12 Speed Rear Derailleur BX PSI whilst the sturdy plastic base

whilst the sturdy plastic base has reinforced holes to allow it to fix onto the top tube bolt bosses

No sliding down the handlebars

The LINK features a flat platform

XS (EU 37-39)

Shimano 105 RD-R7150 Di2 12 Speed Rear Derailleur BX PSI whilst the sturdy plastic baseWide 36T compatible 12 speed Di2 rear derailleur. Receiving the wireless shifting signal from the shift lever, the SHIMANO 105 rear derailleur completes a shift in the blink of an eye with its high performance motor and optimized link structure. This is the hub of the Di2 system, with the charging port, indicator LEDs, adjustment switches and more integrated into a compact package. A low profile design reduces damage from contact and falls.