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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
New Coilover for Girdraulics
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<blockquote data-quote="timetraveller" data-source="post: 101849" data-attributes="member: 456"><p>Greg above is correct but according to my measurements one should never get into that part of the movement regime. I will try and copy the curve I have shown before below. Note that this was made by having a pencil fastened into the front wheel spindle hole and moving the wheel up and down. The pencil itself was held up against a piece of imperial graph paper where the larger squares are one inch, and the smaller ones, one tenth of an inch (2.5 mm). The relevant part of the curve is at the lower end of the right hand curve. The line with a zero against it is when the lower link is horizontal and in this case the wheel was allowed to drop below the zero position by about one inch. If one starts off in that position then is it true that the wheel will move forwards by about 3 to 4 mm before is gets to what is intended to be its original starting position. It can be seen that if the spindle starts off about 5 mm below the zero point, the circle on the line, then there will be about zero to one mm of forwards movement before the lower link is horizontal. I have always assumed that this could be ignored and therefor I advise people to try to get the lower link horizontal with them sitting on the bike but always state that up to half an inch below that position will still be acceptable. If you have the option then it is worth while enlarging this graph and studying the details. I found it quite difficult to obtain these curves and it would be interesting to see Greg's measurements and compare his curves with mine.</p><p>[ATTACH=full]24944[/ATTACH]</p></blockquote><p></p>
[QUOTE="timetraveller, post: 101849, member: 456"] Greg above is correct but according to my measurements one should never get into that part of the movement regime. I will try and copy the curve I have shown before below. Note that this was made by having a pencil fastened into the front wheel spindle hole and moving the wheel up and down. The pencil itself was held up against a piece of imperial graph paper where the larger squares are one inch, and the smaller ones, one tenth of an inch (2.5 mm). The relevant part of the curve is at the lower end of the right hand curve. The line with a zero against it is when the lower link is horizontal and in this case the wheel was allowed to drop below the zero position by about one inch. If one starts off in that position then is it true that the wheel will move forwards by about 3 to 4 mm before is gets to what is intended to be its original starting position. It can be seen that if the spindle starts off about 5 mm below the zero point, the circle on the line, then there will be about zero to one mm of forwards movement before the lower link is horizontal. I have always assumed that this could be ignored and therefor I advise people to try to get the lower link horizontal with them sitting on the bike but always state that up to half an inch below that position will still be acceptable. If you have the option then it is worth while enlarging this graph and studying the details. I found it quite difficult to obtain these curves and it would be interesting to see Greg's measurements and compare his curves with mine. [ATTACH=full]24944[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
New Coilover for Girdraulics
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