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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: 103324" data-attributes="member: 456"><p>As an example of this I am in the middle of communicating with a rider preparing a Comet for racing. It is very light. I supplied him with 30 lbs/inch springs, the lightest I have had made up to now, and these are still too stiff. As part of the experimenting he left one spring as standard and then progressively chopped 20 mm lengths off the other spring, four times. If I have done the sums correctly that is now a 37 lbs/inch spring and of course it is still too stiff. Alternatives being considered are either shorter 30 lbs/inch springs to give less preload or 27lbs/inch springs, the standard length so that if required they can be shortened and still not exceed the 30 lbs/inch rate. I will report back on what we find and no doubt Vibrac will be interested as he found the 30 lbs/inch springs too strong on his single. Note that at £30 a pair these springs are the lowest cost part of this modification.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 103324, member: 456"] As an example of this I am in the middle of communicating with a rider preparing a Comet for racing. It is very light. I supplied him with 30 lbs/inch springs, the lightest I have had made up to now, and these are still too stiff. As part of the experimenting he left one spring as standard and then progressively chopped 20 mm lengths off the other spring, four times. If I have done the sums correctly that is now a 37 lbs/inch spring and of course it is still too stiff. Alternatives being considered are either shorter 30 lbs/inch springs to give less preload or 27lbs/inch springs, the standard length so that if required they can be shortened and still not exceed the 30 lbs/inch rate. I will report back on what we find and no doubt Vibrac will be interested as he found the 30 lbs/inch springs too strong on his single. Note that at £30 a pair these springs are the lowest cost part of this modification. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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