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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: 75800" data-attributes="member: 456"><p>Rob, the way that I see this is that if one imagines the bike moving forwards on the road and hitting a bump then two forces are involved. One is upwards due to the road surface change in level and the other is rearward (think parallelogram of forces). With the standard set up the first one and a half inches of movements are upwards and forwards, by half an inch, depending upon exactly where the suspension was before the impact. Thus the wheel while trying to be forced upwards and backwards by the road surface can only move upwards and forwards. I am not saying that this is the cause of speed wobbles. When I had my major 'off' at Cadwell Park many years ago it was a twitch in the handlebars as the bike went over a repair in the road surface on the long straight that turned into a major tank slapper. I was not braking. No great change in height was involved although clearly there was a small change which I had been able to feel every lap before I crashed. However, the front Vincent damper had leaked but everything else was in good order.</p><p>The mod also reduces the trail when the bike is at rest and that will be what people were trying to do by using concentrics with the standard set up. This probably makes the bike more 'flipable/easier to lean into corners etc.) but it does nothing to change the general path of the wheel movement.</p><p>I am a great believer in real world experience. Whatever the theory if people find it better then fine. Hopefully, once we have the spring strengths finalised more people will be trying this and if they are unhappy I am sure that we will hear about it. So far all feedback has been wholly positive and about twenty five of these have now been sent to people. How many people have actually used them yet I do not know but once the new springs are finalised I would expect the number able to give feedback to increase rapidly. For those who care about the bike looking standard then it is worth while looking at Greg's photographs and deciding whether the look of the bike is seriously different.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 75800, member: 456"] Rob, the way that I see this is that if one imagines the bike moving forwards on the road and hitting a bump then two forces are involved. One is upwards due to the road surface change in level and the other is rearward (think parallelogram of forces). With the standard set up the first one and a half inches of movements are upwards and forwards, by half an inch, depending upon exactly where the suspension was before the impact. Thus the wheel while trying to be forced upwards and backwards by the road surface can only move upwards and forwards. I am not saying that this is the cause of speed wobbles. When I had my major 'off' at Cadwell Park many years ago it was a twitch in the handlebars as the bike went over a repair in the road surface on the long straight that turned into a major tank slapper. I was not braking. No great change in height was involved although clearly there was a small change which I had been able to feel every lap before I crashed. However, the front Vincent damper had leaked but everything else was in good order. The mod also reduces the trail when the bike is at rest and that will be what people were trying to do by using concentrics with the standard set up. This probably makes the bike more 'flipable/easier to lean into corners etc.) but it does nothing to change the general path of the wheel movement. I am a great believer in real world experience. Whatever the theory if people find it better then fine. Hopefully, once we have the spring strengths finalised more people will be trying this and if they are unhappy I am sure that we will hear about it. So far all feedback has been wholly positive and about twenty five of these have now been sent to people. How many people have actually used them yet I do not know but once the new springs are finalised I would expect the number able to give feedback to increase rapidly. For those who care about the bike looking standard then it is worth while looking at Greg's photographs and deciding whether the look of the bike is seriously different. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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