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General Chat (Vincent Related)
Racer Suspension
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<blockquote data-quote="timetraveller" data-source="post: 116093" data-attributes="member: 456"><p>Just to clarify this; what I discovered after quite a lot of testing, and I put the graphs on here, is that if the front lower spindle is half an inch below the rear spindle, that is the one through the concentrics, then the wheel will move forwards when the suspension is compressed. That is what JE and DD were trying to avoid. If there is about quarter of an inch, 6 mm, difference in height, then there is an almost vertical movement of the front wheel before is starts to move both upwards and backwards. Provided that the height difference is less than this then the suspension will behave as wished, this is all with the rider seated. Because it is difficult to get this just right on ones own then I always emphasise that the lower spindle should be about horizontal and if there has to be an error then it should be along the lines of the front being very slightly higher than the rear. The higher that it stars off the less potential movement there is but for racing that will not be important. For comfort on the road then the most movement possible will make for a better ride.</p><p>The springs provided for Vibrac are the weakest that I have had made as they are hoping to build a light weight bike. If it turns out that the springs are too weak in use then they can either move up from 30 lbs/inch to 33 lbs/inch or alternatively pack the spring slightly. For racing, where one wishes to get the very best from the system some amount of experimenting will be required but with an adjustable AVO damper and the various rates of springs I have available then it should be possible to get the best out of the system that is possible.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 116093, member: 456"] Just to clarify this; what I discovered after quite a lot of testing, and I put the graphs on here, is that if the front lower spindle is half an inch below the rear spindle, that is the one through the concentrics, then the wheel will move forwards when the suspension is compressed. That is what JE and DD were trying to avoid. If there is about quarter of an inch, 6 mm, difference in height, then there is an almost vertical movement of the front wheel before is starts to move both upwards and backwards. Provided that the height difference is less than this then the suspension will behave as wished, this is all with the rider seated. Because it is difficult to get this just right on ones own then I always emphasise that the lower spindle should be about horizontal and if there has to be an error then it should be along the lines of the front being very slightly higher than the rear. The higher that it stars off the less potential movement there is but for racing that will not be important. For comfort on the road then the most movement possible will make for a better ride. The springs provided for Vibrac are the weakest that I have had made as they are hoping to build a light weight bike. If it turns out that the springs are too weak in use then they can either move up from 30 lbs/inch to 33 lbs/inch or alternatively pack the spring slightly. For racing, where one wishes to get the very best from the system some amount of experimenting will be required but with an adjustable AVO damper and the various rates of springs I have available then it should be possible to get the best out of the system that is possible. [/QUOTE]
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Racer Suspension
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