Pick your inner diameter, outer diameter, thickness and shape. We pull it from our shop and get it shipped the same day. In-house stock.
Four choices, one price, one button. Takes under a minute on a phone.
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 quotePick shape, ID, OD, thickness and quantity. Live price as you go.
Your order lands in our shop the moment you check out. Real humans pull it off the shelf — no drop-shipping, no middleman.
Ships the same day if ordered before cutoff. Track your order and get back to tuning.
Racing Shims exists because nobody sold shims the way racers actually buy them: by exact spec, by the quantity you need, no minimums, no waiting. So we built it — real shims, real inventory, pulled and shipped the same day you order.
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.
Yes — if your order lands before the daily cutoff, it ships same day. Otherwise it goes out next business morning.
$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 original packaging can come back within 30 days. We can't take back opened/used stacks for obvious reasons.