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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Rapide front brakes
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<blockquote data-quote="timetraveller" data-source="post: 123254" data-attributes="member: 456"><p>I'm not sure that the girdraulics can be described as 'anti dive'. My understanding is that the idea was that for a lot of riding the movement of the front wheel was essentially vertical and thus the wheel base stayed constant. I am not sure why this was thought to be a good idea. The problem arises when one looks at the whole of the front wheel travel path. When the wheel is at its lowest position it moves backwards to give about five inches of trail. It then moves forwards and upwards until it gets to that part of its track where the movement is essentially vertical. Further than that, when the wheel is at its highest point it is then moving forwards again. Look at the angle of the lower link on most bikes and it is very low at the front when compared with the rear i.e. the eccentrics. What this means is that when a bump is hit and the wheel tries to move upwards there is a lot of force in the lower link trying to force the link backwards through the eccentric. The combination of a horizontal lower link and bearings of some sort to replace the Oilite bushes in the eccentrics seems to be what frees up the front end dramatically and allows it to respond rapidly to small bumps in the road surface.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 123254, member: 456"] I'm not sure that the girdraulics can be described as 'anti dive'. My understanding is that the idea was that for a lot of riding the movement of the front wheel was essentially vertical and thus the wheel base stayed constant. I am not sure why this was thought to be a good idea. The problem arises when one looks at the whole of the front wheel travel path. When the wheel is at its lowest position it moves backwards to give about five inches of trail. It then moves forwards and upwards until it gets to that part of its track where the movement is essentially vertical. Further than that, when the wheel is at its highest point it is then moving forwards again. Look at the angle of the lower link on most bikes and it is very low at the front when compared with the rear i.e. the eccentrics. What this means is that when a bump is hit and the wheel tries to move upwards there is a lot of force in the lower link trying to force the link backwards through the eccentric. The combination of a horizontal lower link and bearings of some sort to replace the Oilite bushes in the eccentrics seems to be what frees up the front end dramatically and allows it to respond rapidly to small bumps in the road surface. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Rapide front brakes
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