Lots of people prefer to race (cars & bikes) with straight rate springs because of consistency on the smoother better traction surfaces. Also if you race "seriously" it is easier to change the set-up and detect differences. Helps to have several various rates at the track. Variable rate springs work well for "street" riding/ driving because of surfaces and varying speeds/ operator skill levels. Yes, Kevin, you may like your springs at the track with all the "progressive" end loped off................................... :thumbsup: