SRAM Derailleur Chain Gap Adjustment Gauge

The SRAM Derailleur Chain Gap Adjustment Gauge is used to set and fine tune rear derailleur spacing between the derailleur and cassette. Correct B-gap setup helps improve shifting performance and keeps the drivetrain aligned for the cassette range being used.

This compact gauge is small enough to keep in a toolbox, travel kit, or on-the-go repair setup. Choose the Eagle / Eagle AXS 50–52T version for SRAM Eagle mountain drivetrains, or choose the eTap AXS 26–44T version for SRAM eTap AXS road and gravel drivetrains.

Select the version that matches your drivetrain and cassette size range.