SPC Performance Zinc Shims 4X6.5X4.0 deg.

When you need to dial in the alignment on a tandem trailer or heavy-duty truck, these axle shims from SPC Performance are a solid choice. They're designed to quickly and accurately adjust the angle of your front or rear axles, helping you get everything tracking straight.

These shims are made from a Zinc Alloy, which offers a notable step up in performance compared to traditional aluminum shims. You get the hardness similar to premium manganese bronze shims, along with much better compression strength than aluminum. This means they'll hold their shape and maintain your alignment settings reliably under load. They measure 4 inches wide, 6.5 inches long, and provide a 4.0-degree angle adjustment. Each box contains six shims.

If you're using Z Blocks or axle spacers with these shims, it's a good idea to spread the load to prevent the shim from crushing, ensuring a long service life.