Coilover Spanner Wrench Guide: Types, Sizes, and How to Use One

Coilover kits use a threaded lock ring, sometimes called a spring perch nut, that rides on the shock body. Three wrench styles cover almost every kit on the road:

• Pin/hook C-spanners - two pins or a hooked jaw drop into holes machined around the ring. These are brand-specific because pin spacing and ring diameter vary, which is why BC Racing, Tein, and QA1 each sell their own.
• Adjustable, variable-pin spanners - one tool with a sliding pin that covers a wide diameter range, such as a variable-pin spanner wrench that adjusts from about 1-1/4" to 5". These work on most generic or lowering-kit coilovers that use a round perforated ring.
• Ratchet-style spanners - a spanner head that bolts to a 3/8" or 1/2" ratchet. QA1 sells both a two-piece set and a ratchet-head version for its drag and street shocks, which gives more leverage when you're cycling through height settings on a lift.

Match the wrench to the brand before you order. Specs below come from each manufacturer's or retailer's product page at the time of writing.

*Prices are approximate ranges at the time of writing, sourced from the brand and retailer pages listed below; confirm current pricing before you order.

Manufacturer instructions and owner reports describe the same basic routine for adjusting ride height with a spanner wrench:

1. Support the car on jack stands or a lift and take enough weight off the suspension that the spring isn't fully loaded against the ring.
2. Seat both pins, or the full hook, in the ring's holes before applying force - a half-seated spanner is how pins snap or rings round off.
3. Turn the lower mount or perch ring to set ride height, then turn the upper lock ring back down against it to clamp the setting in place.
4. Adjust all four corners by the same number of turns, or the same measured thread length, so the car doesn't end up raked or cross-weighted.
5. Re-torque the lock ring and recheck ride height and alignment once the car is back on the ground; see how to adjust coilovers for the full step-by-step.

A spanner wrench only turns the ring - it does not release spring tension. If you're removing the spring itself rather than just adjusting height, you need a coil spring compressor as well.

A few details matter more than brand name when you're choosing a wrench:

• Ring diameter - measure the outer diameter of your lock ring and perch, since most aftermarket coilover brands run 60-90mm, and check that number against the wrench's stated range rather than guessing.
• Pin spacing and jaw style - a brand-specific wrench only works if the pin spacing matches that brand's ring pattern; a variable-pin universal spanner trades a little precision for covering more rings.
• Drive type - some wrenches take a 3/8" or 1/2" ratchet or breaker bar for extra leverage; others are a fixed handle you turn by hand.
• Material - chrome-vanadium steel resists bending under load better than stamped steel, which matters if the ring is seized with rust or old thread-locker.
• Set vs. single wrench - most kits need two wrenches, one for the lock ring and one for the perch, sold as a two-piece set rather than a single tool.