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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Eight inch brake ?
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<blockquote data-quote="hadronuk" data-source="post: 89744" data-attributes="member: 1866"><p>I think there is a simple way to summarize the balance bar debate that bypasses lever ratio complications.</p><p></p><p>With the original Vincent set up (<em>with the cable from the handlebars attached to the END of the balance bar</em>) the force in EACH cable at the brake is the same as the force in the cable at the handlebar lever. This is ignoring friction.</p><p></p><p>With a balance bar fitted at the handlebars so that the cable from the lever is attached to the CENTRE of the balance bar, the force in each cable at the brake is half the force in the cable at the handlebar lever. Again this is ignoring friction.</p><p></p><p>So the standard balance beam does not double the force, but it does apply twice as much force as a centre-pull balance beam.</p><p></p><p>The test rigs are interesting, as they should give an idea of friction levels. My guess is friction could be perhaps 5lbs, so a test force of 10lbs could be very misleading as an attempt to establish basic principles. 5lbs friction would be much less significant at cable forces of around 100lbs.</p><p></p><p>Could I suggest to all the fans of the extra bracing of balance bar pivot that they measure the deflection present before making changes?</p><p></p><p>By my admittedly crude measurement it is very small.</p><p>95% of the flex in the standard system is in the steel brake backplates.</p><p>After I fitted the 8" brakes, the vastly better rigidity and accuracy of the backplates meant I was able to use rear brake levers for a substantial increase in braking pressure. This is with the standard balance bar, and the brakes are still firmer than the originals, in spite of the extra leverage and no pivot point bracing. With so much leverage, I do need to keep the brake closely adjusted of course.</p><p></p><p>However, I have concluded that the 8" brake is perhaps overkill for a solo bike and adds unsprung weight.</p><p>Even when I did consecutive brake tests (approaching 1g stopping from 70mph) it was still quite cool.</p><p>If I had the money and energy, I would try either the Speet brake or the VOC spares company 7" alloy backplates with the rear brake levers.</p></blockquote><p></p>
[QUOTE="hadronuk, post: 89744, member: 1866"] I think there is a simple way to summarize the balance bar debate that bypasses lever ratio complications. With the original Vincent set up ([I]with the cable from the handlebars attached to the END of the balance bar[/I]) the force in EACH cable at the brake is the same as the force in the cable at the handlebar lever. This is ignoring friction. With a balance bar fitted at the handlebars so that the cable from the lever is attached to the CENTRE of the balance bar, the force in each cable at the brake is half the force in the cable at the handlebar lever. Again this is ignoring friction. So the standard balance beam does not double the force, but it does apply twice as much force as a centre-pull balance beam. The test rigs are interesting, as they should give an idea of friction levels. My guess is friction could be perhaps 5lbs, so a test force of 10lbs could be very misleading as an attempt to establish basic principles. 5lbs friction would be much less significant at cable forces of around 100lbs. Could I suggest to all the fans of the extra bracing of balance bar pivot that they measure the deflection present before making changes? By my admittedly crude measurement it is very small. 95% of the flex in the standard system is in the steel brake backplates. After I fitted the 8" brakes, the vastly better rigidity and accuracy of the backplates meant I was able to use rear brake levers for a substantial increase in braking pressure. This is with the standard balance bar, and the brakes are still firmer than the originals, in spite of the extra leverage and no pivot point bracing. With so much leverage, I do need to keep the brake closely adjusted of course. However, I have concluded that the 8" brake is perhaps overkill for a solo bike and adds unsprung weight. Even when I did consecutive brake tests (approaching 1g stopping from 70mph) it was still quite cool. If I had the money and energy, I would try either the Speet brake or the VOC spares company 7" alloy backplates with the rear brake levers. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Eight inch brake ?
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