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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Brampton Coil-Over Damper
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<blockquote data-quote="Oldhaven" data-source="post: 72876" data-attributes="member: 2879"><p>There is a bit of previous discussion about Brampton's geometry on this penultimate page of the very interesting thread "comet suspension" . </p><p></p><p><a href="http://www.vincentownersclub.co.uk/index.php?threads/comet-suspension.5504/page-30" target="_blank">http://www.vincentownersclub.co.uk/index.php?threads/comet-suspension.5504/page-30</a></p><p></p><p>My comments there resulted from the beginning of my conversion to Patzke taper roller bearings, and I did a measurement of the rear spindle distance with the stock roller bearings before the change. I was going to follow up after the conversion and do not remember doing that, so I went out this morning and did it. The stock distance was about 8.680, and it is now about 8.760 after the conversion. Tthis is not quite the 3mm difference I was expecting, but it would change the stock geometry. (This is rough measuring using the points of a dial caliper on the center ends of the spindles.) The front distance appears to be around 9.375, which would not have changed. It could be that the stock Brampton distances were based on even fractional numbers of 8-11/16 and 9-3/8, if the engineer was left brained, but that is a guess. As timetraveller says, getting a good plot of Brampton travel or the details of the geometry like the figures Hadronuk had for the Girdraulics would be very interesting. I'm too busy/lazy to disassemble mine for that, but perhaps someone in the midst of a rebuild could do it.</p><p></p><p>As an aside from the front discussion, the installed extended length of the davidd/Justin rear springs/boxes/Thornton combination mentioned above, spindle to spindle, is ~10-3/4" with the bike on the center stand and the rear wheel off the ground. I had to preload them a lot to get the boxes in with the Thornton fully extended, (scary enough for me), though I added HDPE cups at the ends of the springs so they are just a few thousandths longer than the designer intended. They do not settle much off the stand.</p><p></p><p>Ron</p></blockquote><p></p>
[QUOTE="Oldhaven, post: 72876, member: 2879"] There is a bit of previous discussion about Brampton's geometry on this penultimate page of the very interesting thread "comet suspension" . [URL]http://www.vincentownersclub.co.uk/index.php?threads/comet-suspension.5504/page-30[/URL] My comments there resulted from the beginning of my conversion to Patzke taper roller bearings, and I did a measurement of the rear spindle distance with the stock roller bearings before the change. I was going to follow up after the conversion and do not remember doing that, so I went out this morning and did it. The stock distance was about 8.680, and it is now about 8.760 after the conversion. Tthis is not quite the 3mm difference I was expecting, but it would change the stock geometry. (This is rough measuring using the points of a dial caliper on the center ends of the spindles.) The front distance appears to be around 9.375, which would not have changed. It could be that the stock Brampton distances were based on even fractional numbers of 8-11/16 and 9-3/8, if the engineer was left brained, but that is a guess. As timetraveller says, getting a good plot of Brampton travel or the details of the geometry like the figures Hadronuk had for the Girdraulics would be very interesting. I'm too busy/lazy to disassemble mine for that, but perhaps someone in the midst of a rebuild could do it. As an aside from the front discussion, the installed extended length of the davidd/Justin rear springs/boxes/Thornton combination mentioned above, spindle to spindle, is ~10-3/4" with the bike on the center stand and the rear wheel off the ground. I had to preload them a lot to get the boxes in with the Thornton fully extended, (scary enough for me), though I added HDPE cups at the ends of the springs so they are just a few thousandths longer than the designer intended. They do not settle much off the stand. Ron [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Brampton Coil-Over Damper
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