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Cornering a Vincent
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<blockquote data-quote="davidd" data-source="post: 92059" data-attributes="member: 1177"><p>Greg,</p><p></p><p>I certainly wish that I knew more about this particular problem. Your experience was an important factor in confirming that there was a possible problem with the handle bar ergonomics on Girdraulics. I think the best news is that stock bars seem to cure any problems that might be caused by experimentation. If you think you have a problem it is great to go back to a basic set up that works. I mentioned this problem to Patrick after the IOM race that Bruno ran in 2015. He may have designed his bars with that in mind. I did not want him to waste time like I did trying to figure out an odd and obscure problem that was difficult to pin down.</p><p></p><p>I felt that the problem I was experiencing was not due to the weight on the front end specifically, but the weight on the bars. It disappeared when I could hold the bars loosely with no weight on the grips, which was supplied by the stock bars. Any excess weight on the grips and it was like steering with an overly tight damper, it was hard to settle on a line and when you did it was hard to change it again. This appeared to me like it was just an oddity of having the bars behind the turning center of the forks, maybe. I felt that I was never able to locate the problem, only the cure.</p><p></p><p>I did check the weight balance of the bike loaded with me as the rider in full gear. I think it is good to know how much weight is actually on the front and rear wheels with the rider in the riding position. I found that I crowded the tank and that put the weight further forward. I noticed when I lengthened the seat I did not crowd the tank as much, even though I did not feel uncomfortable crowding the tank. It is pretty easy to do in the shop with an old spring scale. Run the front onto the scale and assume the riding position. Do the same with the rear. It is good to have a few hands to help. It can give you a base line if you like what you have. When you change bars, seat or pegs you can weigh yourself again and test your results to the base line. </p><p></p><p>Phil is very good and he will probably want to experiment with tire compounds to make sure he has the sliding on the front down to something that he is comfortable with. I am not sure I mentioned this before, but the Comet racers seem to respond incredibly well to the lower profile tires. Carleton mentioned this to me again this past weekend. He found a big gain when he swapped to 80's. It was not as obvious to me because I was fighting with this handling problem mentioned above. When I solved that my lap times lowered by a huge amount and I was overjoyed with the handling.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 92059, member: 1177"] Greg, I certainly wish that I knew more about this particular problem. Your experience was an important factor in confirming that there was a possible problem with the handle bar ergonomics on Girdraulics. I think the best news is that stock bars seem to cure any problems that might be caused by experimentation. If you think you have a problem it is great to go back to a basic set up that works. I mentioned this problem to Patrick after the IOM race that Bruno ran in 2015. He may have designed his bars with that in mind. I did not want him to waste time like I did trying to figure out an odd and obscure problem that was difficult to pin down. I felt that the problem I was experiencing was not due to the weight on the front end specifically, but the weight on the bars. It disappeared when I could hold the bars loosely with no weight on the grips, which was supplied by the stock bars. Any excess weight on the grips and it was like steering with an overly tight damper, it was hard to settle on a line and when you did it was hard to change it again. This appeared to me like it was just an oddity of having the bars behind the turning center of the forks, maybe. I felt that I was never able to locate the problem, only the cure. I did check the weight balance of the bike loaded with me as the rider in full gear. I think it is good to know how much weight is actually on the front and rear wheels with the rider in the riding position. I found that I crowded the tank and that put the weight further forward. I noticed when I lengthened the seat I did not crowd the tank as much, even though I did not feel uncomfortable crowding the tank. It is pretty easy to do in the shop with an old spring scale. Run the front onto the scale and assume the riding position. Do the same with the rear. It is good to have a few hands to help. It can give you a base line if you like what you have. When you change bars, seat or pegs you can weigh yourself again and test your results to the base line. Phil is very good and he will probably want to experiment with tire compounds to make sure he has the sliding on the front down to something that he is comfortable with. I am not sure I mentioned this before, but the Comet racers seem to respond incredibly well to the lower profile tires. Carleton mentioned this to me again this past weekend. He found a big gain when he swapped to 80's. It was not as obvious to me because I was fighting with this handling problem mentioned above. When I solved that my lap times lowered by a huge amount and I was overjoyed with the handling. David [/QUOTE]
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