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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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<blockquote data-quote="davidd" data-source="post: 159253" data-attributes="member: 1177"><p>I don't have the numbers in front of me, but in general, using a concentric shortens the trail from stock because it is moving the lower link halfway to the sidecar position. The sidecar position is closer to no trail because lots of trail makes steering very heavy for a sidecar machine. In the old days, many owners used a short top link for sidecar work because the eccentric was a compromise and did not shorten the trail as much as someone with a double adult sidecar would desire.</p><p></p><p>In the US, almost all of the Vincent racers are using the DD steering stem, but the slow steering is caused by the large rake and not the steering stem. All of the racers using the new stem have also steepened the rake. So, it may seem like the two are connected, but they are not.</p><p></p><p>The easiest way to alter the rake is to use the Reg Bolton mod described years ago in MPH. This mod also gives more ground clearance as an added benefit.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 159253, member: 1177"] I don't have the numbers in front of me, but in general, using a concentric shortens the trail from stock because it is moving the lower link halfway to the sidecar position. The sidecar position is closer to no trail because lots of trail makes steering very heavy for a sidecar machine. In the old days, many owners used a short top link for sidecar work because the eccentric was a compromise and did not shorten the trail as much as someone with a double adult sidecar would desire. In the US, almost all of the Vincent racers are using the DD steering stem, but the slow steering is caused by the large rake and not the steering stem. All of the racers using the new stem have also steepened the rake. So, it may seem like the two are connected, but they are not. The easiest way to alter the rake is to use the Reg Bolton mod described years ago in MPH. This mod also gives more ground clearance as an added benefit. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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