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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Spring rates - how to determine
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[QUOTE="Jeremy Wilkey, post: 179776, member: 17220"] GH, Fork springs have been a indusrty type thing for years... Forks have simliar geometry and make spring selection a snap. Rate is a function of rider weight and bike weight. Preload is allso factored when say a rider is more or less a percentage of total weight. So say a CR450 will require lighter springs than a xr650, but not propertunalty to the weight diference of the bike. The avergae rider weight stays simliar so rate increases slightly but preload increases even more.. Shocks most tunners have claculated a slope incetcept furmula after they test ideal sag numbers for lighht and havy riders. You can do a quick average based on linkage rate but that may not work out well if you have a very funky linkage. Also some bike work better or worse based on difrences in chassis geometry or tunner prefrence. After this base line most tunners alter for SX, or Rocky condtions. Either way the advice will still be influnced by the suspensiuon guy dishing it out.. Regards, Jer [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Spring rates - how to determine
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