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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Speet Brake Installation Query
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<blockquote data-quote="Nigel Spaxman" data-source="post: 110610" data-attributes="member: 2907"><p>You won't get extra braking force from the balance beam. Any lever type device if it increases force will loose movement in the exact proportion. Going back decades in MPH there are lots of people arguing that this device somehow magically increases the force on the brake shoes, it doesn't. </p><p></p><p>If for example the tension in the single brake cable caused by squeezing the lever with a force of 100 lbs and movement in the cable of 1/2" Then you will have 100 lbs of force on each end of the balance beam. If you pretend there is no stretch in the brake cables and all the flex is in the brake then you will have 1/4" of movement of each brake lever and 100 lbs force on both levers. </p><p></p><p>If you have twin cables you will end up with only 50lbs tension in each cable but you will have the full 1/2" of movement at both brake levers. (this is how the Speet system works) With the extra movement of the cables you can use much longer levers on the brake cams, twice as long in theory, maybe a bit more really. With twin cables and half as much force on each cable there must be less stretch. The stretch does seem like the waste in the system.</p><p></p><p>If you want to retain the balance beam as John McDougal did with his Speet brakes, then you will need levers on the brakes about half as long as the ones that come with the Speet brakes (they are made for twin cable that move twice as much) John modified his Speet brakes in that way.</p><p></p><p> I have the Speet brakes with the twin cable set up. With this set up you have to make sure that both cables have even tension in them when the brakes are applied. The balance beam does that automatically. You can fine tune the brakes a bit. When I first used these brakes I had levers with 1 1/8 distance between the pivot and the cable. That made the lever to hard, so I welded up the lever and reduced the distance to about .800" which works really well. The proper distance, between pivot and cable that the Speet and Vincent brakes are designed for is .875". By shortening this a bit I gained a bit of leverage. If you keep your brakes well adjusted you can set them up for a bit more leverage, and have better brakes.</p></blockquote><p></p>
[QUOTE="Nigel Spaxman, post: 110610, member: 2907"] You won't get extra braking force from the balance beam. Any lever type device if it increases force will loose movement in the exact proportion. Going back decades in MPH there are lots of people arguing that this device somehow magically increases the force on the brake shoes, it doesn't. If for example the tension in the single brake cable caused by squeezing the lever with a force of 100 lbs and movement in the cable of 1/2" Then you will have 100 lbs of force on each end of the balance beam. If you pretend there is no stretch in the brake cables and all the flex is in the brake then you will have 1/4" of movement of each brake lever and 100 lbs force on both levers. If you have twin cables you will end up with only 50lbs tension in each cable but you will have the full 1/2" of movement at both brake levers. (this is how the Speet system works) With the extra movement of the cables you can use much longer levers on the brake cams, twice as long in theory, maybe a bit more really. With twin cables and half as much force on each cable there must be less stretch. The stretch does seem like the waste in the system. If you want to retain the balance beam as John McDougal did with his Speet brakes, then you will need levers on the brakes about half as long as the ones that come with the Speet brakes (they are made for twin cable that move twice as much) John modified his Speet brakes in that way. I have the Speet brakes with the twin cable set up. With this set up you have to make sure that both cables have even tension in them when the brakes are applied. The balance beam does that automatically. You can fine tune the brakes a bit. When I first used these brakes I had levers with 1 1/8 distance between the pivot and the cable. That made the lever to hard, so I welded up the lever and reduced the distance to about .800" which works really well. The proper distance, between pivot and cable that the Speet and Vincent brakes are designed for is .875". By shortening this a bit I gained a bit of leverage. If you keep your brakes well adjusted you can set them up for a bit more leverage, and have better brakes. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Speet Brake Installation Query
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