Funny you should ask, we have been trying out some different combinations of springs with good success. Right now my buggy weighs 6.8 lbs (under the limit, I know) and I'm running orange rears with pink fronts and it feels super locked in. We're finding that our rear springs are on the light side and our fronts are on the stiff side, that's why a lot of guys are liking the Kyosho springs.