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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Eight inch brake ?
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<blockquote data-quote="Nigel Spaxman" data-source="post: 89706" data-attributes="member: 2907"><p>I remember talking to John McDougal about this. He had installed Speet brakes and had elected to retain the balance beam. He preferred the look of this system, and it can have some advantages when it comes to quickly removing the wheel. In order for this to work right he had to shorten the levers on the brake plates quite a bit (theoretically by half) I told him about how I understood how the balance beam worked. He said I was probably one of very few people who understood it. None of these mechanisms will give you something for nothing. If a lever is twice as long it will double the torque with the same force applied, but to have the same torque and angular movement the distance the force is applied will be doubled so nothing is really gained. It is the same thing with the balance beam. It does apply the same force to each side of the brake and that force is the same as the force in the cable that comes from the handlebar, the trouble is that both ends of the beam move only half as far as the cable where it leaves the handlebar lever. To operate the brake you really need force times distance not just force. If is so simple I can't believe people are still arguing about it after 60 years. </p><p></p><p>I have Speet brakes on my bike. I used the twin cable system that came with it. To get that to work properly you need to have brake levers with 7/8" distance between the pivot and the cable. I had to modify my lever because I am using Amal racing type levers and they have 1 1/8" centers. The Speet brake is pretty good even for two up touring with luggage.</p></blockquote><p></p>
[QUOTE="Nigel Spaxman, post: 89706, member: 2907"] I remember talking to John McDougal about this. He had installed Speet brakes and had elected to retain the balance beam. He preferred the look of this system, and it can have some advantages when it comes to quickly removing the wheel. In order for this to work right he had to shorten the levers on the brake plates quite a bit (theoretically by half) I told him about how I understood how the balance beam worked. He said I was probably one of very few people who understood it. None of these mechanisms will give you something for nothing. If a lever is twice as long it will double the torque with the same force applied, but to have the same torque and angular movement the distance the force is applied will be doubled so nothing is really gained. It is the same thing with the balance beam. It does apply the same force to each side of the brake and that force is the same as the force in the cable that comes from the handlebar, the trouble is that both ends of the beam move only half as far as the cable where it leaves the handlebar lever. To operate the brake you really need force times distance not just force. If is so simple I can't believe people are still arguing about it after 60 years. I have Speet brakes on my bike. I used the twin cable system that came with it. To get that to work properly you need to have brake levers with 7/8" distance between the pivot and the cable. I had to modify my lever because I am using Amal racing type levers and they have 1 1/8" centers. The Speet brake is pretty good even for two up touring with luggage. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Eight inch brake ?
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