I realize that setting race sag is not done as much with ATVs as it is with dirt bikes, but I also know there are a lot of really smart people on this site, with a wealth of experience in setting up race suspensions, so here is my question:
When setting race sag, and dialing in an aftermarket suspension, when do you know that you will need a higher than stock rate spring (or lower than stock rate for that matter). Take for example a YFZ that has 9" of rear suspension travel:
In choosing the correct spring for my Ohlins rear shock, I want about 25mm of static sag, and about 75 mm of total sag. So, ... if I have 25 mm of static sag, but 125 mm of total sag, and the spring length (preload) is within spec, then I need the optional stiffer spring, right? I weigh just over 220 lbs.
So is this the correct way to determine if a stiffer spring is needed? Am I on the right track? Are my numbers correct? Thanks for your help.
2005 Yamaha YFZ 450: USRA Desert #3: Houser stem; Precision dampener; Fasst Flexx bars; orange plastic;
FMF Q2 exhaust; Ohlins suspension; T-9 Bajas; iRazrs.
2005 KTM 525 MXC: Stock, no mods needed.