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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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<blockquote data-quote="davidd" data-source="post: 121481" data-attributes="member: 1177"><p>There has been so much discussion of this issue I don't blame anyone for having questions. I originally had this discussion with Rip Tragle on this Forum. The new FF2 will prevent a wobble, but it is a specific Vincent wobble that is really un unforced error. You cannot prevent "all" wobbles because a wobble on a motorcycle is part of the two-wheel design. Wobbles can be minimized, but not eradicated.</p><p></p><p>The wobble that could happen with the Girdraulic occurs because the axle path was designed incorrectly. It angles forward and up. The new stems change the path to either straight up and down (with a slight rearward tilt) in the case of the JE stem to rearward or "telescopic.</p><p></p><p>I did a full-size mock-up of the Brampton and the Geometry was very close to straight up and down. I did not have working Brampton at the time, but I remember deciding that the difference in Brampton geometry was why the forks were seen as a good replacement for Girdraulics. As a result, I chose a Girdraulic axle path that was closer to the Brampton, mostly because I thought that Vincent and Irving would have done so if they had realized that the Brampton geometry had been abandoned.</p><p></p><p>So, the new stem won't cure all wobbles, but it will provide handling that is very reliable and predictable. </p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 121481, member: 1177"] There has been so much discussion of this issue I don't blame anyone for having questions. I originally had this discussion with Rip Tragle on this Forum. The new FF2 will prevent a wobble, but it is a specific Vincent wobble that is really un unforced error. You cannot prevent "all" wobbles because a wobble on a motorcycle is part of the two-wheel design. Wobbles can be minimized, but not eradicated. The wobble that could happen with the Girdraulic occurs because the axle path was designed incorrectly. It angles forward and up. The new stems change the path to either straight up and down (with a slight rearward tilt) in the case of the JE stem to rearward or "telescopic. I did a full-size mock-up of the Brampton and the Geometry was very close to straight up and down. I did not have working Brampton at the time, but I remember deciding that the difference in Brampton geometry was why the forks were seen as a good replacement for Girdraulics. As a result, I chose a Girdraulic axle path that was closer to the Brampton, mostly because I thought that Vincent and Irving would have done so if they had realized that the Brampton geometry had been abandoned. So, the new stem won't cure all wobbles, but it will provide handling that is very reliable and predictable. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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