Eliminate the wiggle from your derailleur mounting bolt to improve your shifting and reduce drivetrain noise! This is a great bang for your buck! Check out the awesome ThunderStruckMTB review here!

How? The Super Shims fit in the SRAM mounting bolt assembly. They remove they wiggle and add compression force, while still allowing the derailleur to pivot on the bolt. Here is the installation guide.

Compatibility

SRAM has 2 different mounting bolt configurations for these derailleurs. We provide the parts needed for either type, but you will not need each part.

Configuration A requires the small o-ring, wave spring, and large o-ring

SRAM 12 speed Eagle AXS: GX, X01, XX1
SRAM 12 speed Eagle mechanical: X01, XX1

Configuration B requires the star washer and large o-ring

SRAM 12 speed Eagle mechanical: GX
SRAM 11 speed MTB: GX, X01, XX1
SRAM 11 speed road: Rival, Force

Specs

Small O-Ring
- 1mm thickness, 8.5mm ID, 10.5mm OD., 90 Shore A durometer
- Used only on configuration A. Not required for configuration B.
Large O-Ring
- 1.5mm thickness, 13mm ID, 16mm OD, 90 Shore A durometer
- Used on configuration A and B.
Wave Spring
- 0.3mm thickness, ~10.3mm ID, ~15mm OD
- Used only on configuration A. Not required for configuration B.
Star Washer
- 9mm tooth ID, 14mm OD, black phosphate coated spring steel.
- Used only on configuration B. Not required for configuration A.

Tip

You can also source these parts yourself from a hardware supplier. We provided some example links above in case that is helpful.

International Shipping

Due to the high cost of international shipping, we do not ship orders of less than $40 internationally. If you are outside the US and want to order just the Super Shims, we recommend to source the parts directly in your location using the specs above. More info on international shipping is here.

SRAM Upgrade & Rebuild Kits

Missing Links for Cable Actuated Derailleurs

Super Shims

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