Yes by hand just to compare them. I borrowed the lt blue rear springs put them on the handle of my nut driver with the tekno red rears and compressed them. But maybe thats a bad way to compair. Basically what i wanted to try is running the same spring rate as the tekno yellow front and orange rears. But use kyosho springs that are more progressive and that are very close to those tekno ones by feel in hand. Hopefully this makes sense. I due appreciate all the help btw and info!!!