- 42t is compatible with 36t max cassettes while 40t is compatible with 34t max cassettes
- Remove the existing 17t and add the Extended Range cog without any additional spacers to create an 11-40t, or 11-42 10-speed cassette option
- Cogs come with a longer replacement B-limit screw, to avoid running the derailleur with the stock screw maxed out
- Intended for use with single chainring drivetrains. Chainwrap capacity will be an issue for those wanting to use double cranksets
Today's Stock Status
Currently not available
UPC: Not available
EAN: 4712757579796
Manufacturer Part Number: FW10.ER-10SRAM.42.R
EV8451 FW0024
146004-Q0-L