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FJR Motorcycle Forums
FJR Parts & Accessories Discussions
Gen III Non-ES fork upgrade?
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<blockquote data-quote="MCRIDER007" data-source="post: 1271291" data-attributes="member: 329"><p>Its my understanding that with dual rate or progressive rate (which are pretty rare) springs, each coil in the spring compresses at the same rate and the change in the spring rate occurs when one or more coils binds thereby reducing the number of active coils and increasing the effective spring rate. Obviously, if you have 5 tightly wound springs there is going to be a slight delay from when the first and last coil binds and that will be the transition phase from the soft to the hard rate.</p><p></p><p>Most of the dual rate springs I have seen are essentially single rate because the tight coils are already bound when the weight of the bike and rider is applied. I was able to almost completely bind the tight coils on one set of aftermarket FJR dual rate springs by standing it straight up and pushing down with my hands. The worst dual rate springs I have seen were the OEM springs on a 2003 Goldwing that had 90mm of fork sag with the rider's weight. The tight coils were completely bound way before that point.</p><p></p><p>I think the idea behind dual rate springs is be able to ride on the soft rate and then have a much harder rate available to avoid bottoming during heavy braking. If so, then the tight coils should make up at least 2/3rds of the spring's length rather than 1/4-1/3 of the spring's length. In any case, linear springs are going to give more consistent damping than dual rate springs.</p></blockquote><p></p>
[QUOTE="MCRIDER007, post: 1271291, member: 329"] Its my understanding that with dual rate or progressive rate (which are pretty rare) springs, each coil in the spring compresses at the same rate and the change in the spring rate occurs when one or more coils binds thereby reducing the number of active coils and increasing the effective spring rate. Obviously, if you have 5 tightly wound springs there is going to be a slight delay from when the first and last coil binds and that will be the transition phase from the soft to the hard rate. Most of the dual rate springs I have seen are essentially single rate because the tight coils are already bound when the weight of the bike and rider is applied. I was able to almost completely bind the tight coils on one set of aftermarket FJR dual rate springs by standing it straight up and pushing down with my hands. The worst dual rate springs I have seen were the OEM springs on a 2003 Goldwing that had 90mm of fork sag with the rider's weight. The tight coils were completely bound way before that point. I think the idea behind dual rate springs is be able to ride on the soft rate and then have a much harder rate available to avoid bottoming during heavy braking. If so, then the tight coils should make up at least 2/3rds of the spring's length rather than 1/4-1/3 of the spring's length. In any case, linear springs are going to give more consistent damping than dual rate springs. [/QUOTE]
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FJR Motorcycle Forums
FJR Parts & Accessories Discussions
Gen III Non-ES fork upgrade?
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