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General Chat (Vincent Related)
Greg Brillus Racer
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<blockquote data-quote="timetraveller" data-source="post: 51972" data-attributes="member: 456"><p>The FF7 replacements are concentric but that is not the whole story. Their centre has been moved down and backwards to give a geometry whereby the movement of the front wheel spindle is more like that produced by telescopic forks. Upwards and backwards unlike the girdraulic 'S' shape motion. Remember that what counts is the position about which the lower spindle pivots. That is variable with the standard set up; which very cleverly modified both that and the spring pressure.</p><p>The FF8 and 9 are also redundant. Please note that all the credit for the new geometry is with John Emmanuel who very generously allowed me to borrow his modified steering head stem. I then designed what I thought was required to fit to these stems to allow the original lower spindle bushes and top spring box mountings to be used. Shims were also provided to allow sideways fitting of the standard bronze/oilite bushes. From the top photograph you will see that Greg has had to reduce the diameter of the eccentric replacement in order to get them to be a good fit to the inside of his needle roller bearings. Although most of us no longer wish to race we should all be grateful to people like DaveD, John Em and Greg who are prepared to put their money and safety at risk because if the new system is both safer and more comfortable then we all benefit and the mods would not be noticeable to all but the most knowledgeable of viewers.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 51972, member: 456"] The FF7 replacements are concentric but that is not the whole story. Their centre has been moved down and backwards to give a geometry whereby the movement of the front wheel spindle is more like that produced by telescopic forks. Upwards and backwards unlike the girdraulic 'S' shape motion. Remember that what counts is the position about which the lower spindle pivots. That is variable with the standard set up; which very cleverly modified both that and the spring pressure. The FF8 and 9 are also redundant. Please note that all the credit for the new geometry is with John Emmanuel who very generously allowed me to borrow his modified steering head stem. I then designed what I thought was required to fit to these stems to allow the original lower spindle bushes and top spring box mountings to be used. Shims were also provided to allow sideways fitting of the standard bronze/oilite bushes. From the top photograph you will see that Greg has had to reduce the diameter of the eccentric replacement in order to get them to be a good fit to the inside of his needle roller bearings. Although most of us no longer wish to race we should all be grateful to people like DaveD, John Em and Greg who are prepared to put their money and safety at risk because if the new system is both safer and more comfortable then we all benefit and the mods would not be noticeable to all but the most knowledgeable of viewers. [/QUOTE]
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Greg Brillus Racer
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