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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Rear Suspension
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<blockquote data-quote="timetraveller" data-source="post: 42661" data-attributes="member: 456"><p>It is possible that I have missed something in all this but I have not seen any mention of the changes to the rear set up between the 'B's and 'C's. The distance from the pivot to the rear axel was lengthened and the support for the rear friction damper moved forwards. If the rear seat support allowed the friction damper to be in line with the pivot then any movement from a central position would cause the rear of the seat to move downwards which would probably cause the pillion passenger to feel that they were about to be catapulted backwards. Some slight upwards movement would counteract that at the cost of a less smooth ride. I am pretty sure that what Vincents were trying to do was to make the rear suspension less susceptible to different loading by making some of the load essentially unsprung and we have all used the system for years. I have a fully sprung set up on the ex-Cecil Mills bike with Petteford springs and although it is not as comfortable as a 'D' it is certainly more comfortable than the standard set up. I should also say that I too have noticed how much better the bike sits on the road and corners (normal road use not racing) when there is a pillion passenger. The bike feels like it is on rails when cornering but I have never been able to determine why. The rear Armstrong damper is still in good condition as are all pivots,clearances etc. The tyre pressures are correct for me solo so probably a little low for having a heavy rear passenger and yet the handling certainly feels better. Reducing the rear tyre pressure does not produce the same effect as if the rear pressure is low then enthusiastic cornering can make the bike feel like the rear tyre is squirming. Over to you chaps.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 42661, member: 456"] It is possible that I have missed something in all this but I have not seen any mention of the changes to the rear set up between the 'B's and 'C's. The distance from the pivot to the rear axel was lengthened and the support for the rear friction damper moved forwards. If the rear seat support allowed the friction damper to be in line with the pivot then any movement from a central position would cause the rear of the seat to move downwards which would probably cause the pillion passenger to feel that they were about to be catapulted backwards. Some slight upwards movement would counteract that at the cost of a less smooth ride. I am pretty sure that what Vincents were trying to do was to make the rear suspension less susceptible to different loading by making some of the load essentially unsprung and we have all used the system for years. I have a fully sprung set up on the ex-Cecil Mills bike with Petteford springs and although it is not as comfortable as a 'D' it is certainly more comfortable than the standard set up. I should also say that I too have noticed how much better the bike sits on the road and corners (normal road use not racing) when there is a pillion passenger. The bike feels like it is on rails when cornering but I have never been able to determine why. The rear Armstrong damper is still in good condition as are all pivots,clearances etc. The tyre pressures are correct for me solo so probably a little low for having a heavy rear passenger and yet the handling certainly feels better. Reducing the rear tyre pressure does not produce the same effect as if the rear pressure is low then enthusiastic cornering can make the bike feel like the rear tyre is squirming. Over to you chaps. [/QUOTE]
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Forums: Public Access
Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Rear Suspension
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