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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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<blockquote data-quote="John Reynolds" data-source="post: 159254" data-attributes="member: 4136"><p>The 'sluggish' feel of the JE Stem equipped bike when compared with a standard bike could be due to the fact that whereas the standard forks provide 3.25 inches of trail at null (laden) deflection, Girdraulics with the JE Stem have 3.83 inches of trail when at null.</p><p></p><p>It is interesting to observe the respective changes in trail as the forks extend and compress. Whereas trail provided by the JE Stem varies from 4.42 inches at full extension to 3.54 inches at full compression, the trail provided by the standard Series C fork varies from 5.28 at full extension to 1.79 inches at full compression.</p><p></p><p>The increased leverage provided by the full extension trail of the standard fork (5.28 inches) and the decrease in the moment of inertia of the steered assembly which occurs when the fork extends (38% compared to the MoI at full compression) are the reasons why the Girdraulic fork is so prone to tank slappers. Essentially the self aligning force generated by tyre is given a longer lever to shift a smaller load!</p></blockquote><p></p>
[QUOTE="John Reynolds, post: 159254, member: 4136"] The 'sluggish' feel of the JE Stem equipped bike when compared with a standard bike could be due to the fact that whereas the standard forks provide 3.25 inches of trail at null (laden) deflection, Girdraulics with the JE Stem have 3.83 inches of trail when at null. It is interesting to observe the respective changes in trail as the forks extend and compress. Whereas trail provided by the JE Stem varies from 4.42 inches at full extension to 3.54 inches at full compression, the trail provided by the standard Series C fork varies from 5.28 at full extension to 1.79 inches at full compression. The increased leverage provided by the full extension trail of the standard fork (5.28 inches) and the decrease in the moment of inertia of the steered assembly which occurs when the fork extends (38% compared to the MoI at full compression) are the reasons why the Girdraulic fork is so prone to tank slappers. Essentially the self aligning force generated by tyre is given a longer lever to shift a smaller load! [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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