[Bruce Colby]

I checked with them about 18 mo ago and here's what they said,
fronts are 1100 lb/in, rears are 150 for older cars and 185 for the newer cars. I bought a pair of the fronts. When they arrived I measured the wire size and coil dia, and counted the free/active coils. From this I calculated a rate of 922 lb/in, 16% less than claimed. However, counting active coils is not an exact science because of the rubber seats the springs sit in. If I was off by a half coil at each end, the calculated rate would have been 1090. Anyway, I mounted them and they work just fine on the race car (it's fairly light).