11T pulley wheels with sealed bearings and spacers to fit several different rear derailleurs.

The pulley wheels are suitable for:

Shimano 8, 9, 10 & 11 speed with spacer A

Shimano 7 speed & Campagnolo 8 Speed ??with spacer B

Campagnolo 9 & 10 speed with spacer C

Sram 7.0 & 9.0 from 1997-99 with spacer D