FM springs are well known for providing a good balance of street ability and track performance. Their combination of ride height and spring rate means your Miata will ride and handle better than you would expect from a set of performance springs. We give the suspension room to work. While these rates might sound high compared to some other springs on the market, they are stiff enough to keep your car off the bumpstops. Softer springs will often give a worse ride because they allow you to blow through your suspension travel and end up on the stops.
There's more going on than you think, though. See that section with the tighter coils? Those are designed to act as a secondary spring, keeping the spring from going loose under full droop. We've specified a powdercoat with a high zinc content for extra corrosion resistance, too.
How much will they lower your car? We can't tell you, because Mazda changed the ride height of Miatas over the years. However, if you measure from the center of the wheel to the fender lip, you can compare your car to the final result. It's not a huge drop but once you drive the car you'll appreciate how well it works.
Front springs: 318 lb/in
Rear springs: 233 lb/in
Front ride height: 12.5"
Rear ride height: 13"
Set of four. Not recommended with stock shocks - the higher spring rates are too much for stock shocks to handle.
A recent redesign means these springs now work flawlessly with Koni Sport shocks and FM rear mounts.