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FJR Motorcycle Forums
Technical & Mechanical Problems
Setting sag and preload on new fork springs?
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<blockquote data-quote="yamafitter" data-source="post: 1325992" data-attributes="member: 15141"><p>I think Race Tech uses 310 mm springs and I have measured the spring length of my GP Suspension springs and they are only 260 mm. I have the spring buffers installed in my forks and my preload spacer is 143 mm if that is of any help to you.</p><p></p><p>Being an old fat guy I am in the process of going to 1.05 kg fork springs. The 34-45 mm rider sag mentioned earlier is a little excessive but is dependant somewhat on the rear sag to keep things balanced. The idea is to keep the bike ride height somewhat level as to not affect handling. Rear sag is measured vertically and since fork sag is measured parallel to the fork tube it is a little bit more due to the angles involved if ride height front to back is to remain somewhat constant statically.</p><p></p><p>I believe you will find that if rear sag is somewhere between 15-25 mm then front sag should not exceed 35 mm</p></blockquote><p></p>
[QUOTE="yamafitter, post: 1325992, member: 15141"] I think Race Tech uses 310 mm springs and I have measured the spring length of my GP Suspension springs and they are only 260 mm. I have the spring buffers installed in my forks and my preload spacer is 143 mm if that is of any help to you. Being an old fat guy I am in the process of going to 1.05 kg fork springs. The 34-45 mm rider sag mentioned earlier is a little excessive but is dependant somewhat on the rear sag to keep things balanced. The idea is to keep the bike ride height somewhat level as to not affect handling. Rear sag is measured vertically and since fork sag is measured parallel to the fork tube it is a little bit more due to the angles involved if ride height front to back is to remain somewhat constant statically. I believe you will find that if rear sag is somewhere between 15-25 mm then front sag should not exceed 35 mm [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Setting sag and preload on new fork springs?
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