Pick inner diameter, outer diameter, thickness, and shape — one price, one button. New to shim stacks?
Know your part numbers? Pick the parts you want, set quantities, and add them all to your cart at once — then review pricing and adjust anything in the cart.
| Part # | Description | Inner Ø | Outer Ø | Thickness | Notches | Price | Qty |
|---|
If the size you need isn't in the configurator, we can run it custom — valve or bleed. Heads up: custom shims cost more than stocked sizes and take longer to ship while we machine them to your spec.
Send us your shape (valve or bleed), inner diameter, outer diameter, thickness, quantity — plus notch count if you're ordering bleed shims — and we'll come back with a quote and lead time.
Request a custom quote
A shim is a thin metal disc that sits inside a shock absorber and controls how the oil flows through the valving — which is what actually determines how your shock performs. Stacking different diameters and thicknesses lets you tune compression and rebound to how your ride feels on track.
Valve shims are solid round discs — they control the main flow. Bleed shims have a small slot or notch cut into the edge, letting a little oil through even when the stack is seated. Both live in almost every stack.
If you're already tuning your own shocks you'll know your ID/OD/thickness by number. If you're new, grab a dial caliper and measure your existing stack, or call your shock builder.
$6.95 flat on orders under $100. Anything $100 or more ships free, automatically — no code needed.
Shock builders and race teams — reach out for open-account terms and team pricing.
Unopened shims in their original packaging can be returned within 30 days. We can't accept opened or used stacks, for safety and quality reasons.