I weigh between 235 and 240. I bought the 5.8 rear spring. Thats what the calculator said I needed. I get it on and start cranking on it. I have no static sag at all and have 3.5 inches ride-sag in shorts, a t-shirt, and flip-flops. I got home and investigated and noticed that is says I need a 5.9-something if I had a YZ but a 5.79 on the WR thats heavier than the YZ. This was with me checking trail/enduro/desert. If I had clicked MX, it would have told me to get a 6.0. I'm not bashing Race-Tech by no means. Just a little info for anyone using that site as a referance(who's new to this like me). I didn't change the fork springs today because my oil didn't show up but just the rear makes a world of difference. What I want to get at is that if your weight is on the verge or you just like to jump a little, go for the next spring up. My 2005 doesn't plant the front tire all that great in the first place and the lower the rear end, the worse it turns. So, back on the diet for me again.