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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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<blockquote data-quote="timetraveller" data-source="post: 78021" data-attributes="member: 456"><p>Before we all get bogged down in theory can we wait for feedback from users? I know that the 33lb springs and 36 lb spring are now with Greg, who will have to send them on to other people. If two 33s do not do the job on a Comet then two 36s should do. Two 36s with 3" of preload are exerting a force of 206 lbs. Another half inch of movement moves that up to 252 lbs. A further inch of compression increases that to 324 lbs. Use the whole 3" of travel and one is up to a force of 432 lbs, just about the total weight of the bike without a rider. Now start off with 90 lbs/inch springs. In order to get the initial required force of 206 lbs there would have to be a compression of 1.14". (Remember there are two springs). Compress a further one inch and the force is now up to 360 lbs and with a further one inch the total force is up to 540 lbs. That seems like a pretty stiff front end to me but let us see what users find. If that is what is needed than all the springs cost about the same to be made so there is no cost implication, only a comfort one.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 78021, member: 456"] Before we all get bogged down in theory can we wait for feedback from users? I know that the 33lb springs and 36 lb spring are now with Greg, who will have to send them on to other people. If two 33s do not do the job on a Comet then two 36s should do. Two 36s with 3" of preload are exerting a force of 206 lbs. Another half inch of movement moves that up to 252 lbs. A further inch of compression increases that to 324 lbs. Use the whole 3" of travel and one is up to a force of 432 lbs, just about the total weight of the bike without a rider. Now start off with 90 lbs/inch springs. In order to get the initial required force of 206 lbs there would have to be a compression of 1.14". (Remember there are two springs). Compress a further one inch and the force is now up to 360 lbs and with a further one inch the total force is up to 540 lbs. That seems like a pretty stiff front end to me but let us see what users find. If that is what is needed than all the springs cost about the same to be made so there is no cost implication, only a comfort one. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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