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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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<blockquote data-quote="davidd" data-source="post: 78258" data-attributes="member: 1177"><p>Martyn has set up his springs the same way I set up mine. I believed that several springs were necessary to accommodate riders of different weights and loads. I also wanted to use as little preload as possible to allow for the adjustment of ride height, adjusted the way Martyn has done by setting the sag at 25%.</p><p></p><p>The springs are color coded so that they can be used in different combinations:</p><p></p><p> Red 75 lbs/in</p><p> Blue 110 lbs/in</p><p> White 130 lbs/in</p><p></p><p>In combination they can be used to achieve the following spring rates:</p><p></p><p><strong>Color </strong> <strong>Springs Front End Rate</strong></p><p></p><p>Two Reds 75 and 75 lbs/in 150 lbs/in</p><p>One Red and One Blue 75 and 110lbs/in 185 lbs/in </p><p>One Red and One White 75 and 130 lbs/in 205 lbs/in</p><p>Two Blues 110 and 110 lbs/in 220 lbs/in </p><p>One Blue and One White 110 and 130 lbs/in 240 lbs/in</p><p>Two Whites 130 and 130 lbs/in 260 lbs/in</p><p></p><p>If the load you are trying to balance is 210 Lbs./in. then the red and white spring would be best at approximately 205 lbs./in (as Martyn chose). Then the preload can be adjusted, which is really a question of how quickly you want the springs to get to the 210 Lbs./in. If you use a lot of preload, and compress the spring box a long way to get the bolt on, you will get to the 210 Lbs./in. immediately and there will be little or no sag. If you use no preload and just slip the bolt in by hand, you will have no preload and the bike will sag quite a bit. But, if it sags too much, you can slip some spacers in the spring boxes until you hit the mark you want (suggested 25%-30%).</p><p></p><p>Just a note on preload, it can be changed slightly by your choice of parts. If you run eccentrics, the solo position has the least preload and the sidecar position has the most. The concentric position puts it right in the middle. Again, it doesn't change the rate of the spring, but how quickly you get to the higher poundage. </p><p></p><p>I was interested to hear Martyn and Dave's experience on full compression. When I originally selected the rates for the springs I used the original Vincent numbers for full compression. I was hoping that maybe these numbers were too high and it could be lowered, but the few reports we have seem to confirm that they need to be high.</p><p></p><p>I also designed the red springs just for my racer and the Comet. They worked perfectly on the racer, but they do not provide that high full bump number. On the track it was not an issue. As mentioned, I had plenty of surface problems but,they did not cause bottoming out (probably due to the lightness of the bike). In the original Comet Suspension thread it was reported that the reds were too soft for use as a pair on the Comet. I revised the instructions that were written for the springs, accordingly. The red is probably best used as Martyn did in this situation, too soften a heavier spring when paired.</p><p></p><p>The more testing that is done the bigger the data base will be. </p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 78258, member: 1177"] Martyn has set up his springs the same way I set up mine. I believed that several springs were necessary to accommodate riders of different weights and loads. I also wanted to use as little preload as possible to allow for the adjustment of ride height, adjusted the way Martyn has done by setting the sag at 25%. The springs are color coded so that they can be used in different combinations: Red 75 lbs/in Blue 110 lbs/in White 130 lbs/in In combination they can be used to achieve the following spring rates: [B]Color [/B] [B]Springs Front End Rate[/B] Two Reds 75 and 75 lbs/in 150 lbs/in One Red and One Blue 75 and 110lbs/in 185 lbs/in One Red and One White 75 and 130 lbs/in 205 lbs/in Two Blues 110 and 110 lbs/in 220 lbs/in One Blue and One White 110 and 130 lbs/in 240 lbs/in Two Whites 130 and 130 lbs/in 260 lbs/in If the load you are trying to balance is 210 Lbs./in. then the red and white spring would be best at approximately 205 lbs./in (as Martyn chose). Then the preload can be adjusted, which is really a question of how quickly you want the springs to get to the 210 Lbs./in. If you use a lot of preload, and compress the spring box a long way to get the bolt on, you will get to the 210 Lbs./in. immediately and there will be little or no sag. If you use no preload and just slip the bolt in by hand, you will have no preload and the bike will sag quite a bit. But, if it sags too much, you can slip some spacers in the spring boxes until you hit the mark you want (suggested 25%-30%). Just a note on preload, it can be changed slightly by your choice of parts. If you run eccentrics, the solo position has the least preload and the sidecar position has the most. The concentric position puts it right in the middle. Again, it doesn't change the rate of the spring, but how quickly you get to the higher poundage. I was interested to hear Martyn and Dave's experience on full compression. When I originally selected the rates for the springs I used the original Vincent numbers for full compression. I was hoping that maybe these numbers were too high and it could be lowered, but the few reports we have seem to confirm that they need to be high. I also designed the red springs just for my racer and the Comet. They worked perfectly on the racer, but they do not provide that high full bump number. On the track it was not an issue. As mentioned, I had plenty of surface problems but,they did not cause bottoming out (probably due to the lightness of the bike). In the original Comet Suspension thread it was reported that the reds were too soft for use as a pair on the Comet. I revised the instructions that were written for the springs, accordingly. The red is probably best used as Martyn did in this situation, too soften a heavier spring when paired. The more testing that is done the bigger the data base will be. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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