Welcome to Miata Turbo Forum - Turbo Kitten is watching you test compression.
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could these take 700/425?
These are the HD's right?
+/- 100 on each corner so 650/500 would be the stiffest I would try to run on these. Don't see why you would want to do that though - they are stiff enough to handle r-comp tires, yet can be driven on the street. It is slightly harsh with a race seat but nothing compared to spec suspension
FWIW...I run 700/450 on my revalved bilsteins...I'm probably going to 400 rear and adding the rear bar back on. So I would not hesitate to run 700-800lb springs up front. With no aero the 700 could still be stiffer on some tracks I run.
So anyone buying these don't worry. They can handle a variety of rates. I have 550/350 for bumpier tracks.