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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: 75525" data-attributes="member: 1177"><p>Greg,</p><p></p><p>That is great news! I thought it would take some effort once the mods were in place to select the best spring rate. It was quite encouraging with Chris' reports that lighter springs were working well, because I always thought that an overall lighter rate could improve the ride quality. I had always used the stock Vincent spring rate at full compression as a benchmark for the new springs even though I realized that it might be too high. Unfortunately, that may have skewed the range to be too high. I think the data you are generating will be a great aid to pegging the correct range of springs. Starting with the Comet is good as it establishes the lower limit of the range.</p><p></p><p>It was always a goal to get the handling to be at least as good as a B. It turns out that the handling of the Girdraulic can be better due in great part to the damping and the relative stiffness of the Girdraulic compared to the Brampton. I do remember making the change on my racer. I went out at Miller with the hope of watching the front end and noting its movement as I had done so often in the past. I returned to the pits and realized I had not glanced at the front end even once. I tried many times to focus on the movement which was so obvious to me before and I was never successful. I could only conclude that the movement I was used to looking at had gone away and the the mods had made a "calming" effect on the movement. I think that this was a result of the brake no longer causing up and down movement of the fork, which had been so apparent.</p><p></p><p>Just on handling in general, I would mention to those who are interested in mods that the use of 18" wheels on a Vincent really "wakes up the handling" as Carleton Palmer said when he changed to 18" rims. I have mentioned it before, but it has had such a profound effect on the handling of our racing singles that I did not want to be thought of as hiding the results. I see so many racers using 19" wheels I am not certain that anyone else has tried this out. </p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 75525, member: 1177"] Greg, That is great news! I thought it would take some effort once the mods were in place to select the best spring rate. It was quite encouraging with Chris' reports that lighter springs were working well, because I always thought that an overall lighter rate could improve the ride quality. I had always used the stock Vincent spring rate at full compression as a benchmark for the new springs even though I realized that it might be too high. Unfortunately, that may have skewed the range to be too high. I think the data you are generating will be a great aid to pegging the correct range of springs. Starting with the Comet is good as it establishes the lower limit of the range. It was always a goal to get the handling to be at least as good as a B. It turns out that the handling of the Girdraulic can be better due in great part to the damping and the relative stiffness of the Girdraulic compared to the Brampton. I do remember making the change on my racer. I went out at Miller with the hope of watching the front end and noting its movement as I had done so often in the past. I returned to the pits and realized I had not glanced at the front end even once. I tried many times to focus on the movement which was so obvious to me before and I was never successful. I could only conclude that the movement I was used to looking at had gone away and the the mods had made a "calming" effect on the movement. I think that this was a result of the brake no longer causing up and down movement of the fork, which had been so apparent. Just on handling in general, I would mention to those who are interested in mods that the use of 18" wheels on a Vincent really "wakes up the handling" as Carleton Palmer said when he changed to 18" rims. I have mentioned it before, but it has had such a profound effect on the handling of our racing singles that I did not want to be thought of as hiding the results. I see so many racers using 19" wheels I am not certain that anyone else has tried this out. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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