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#101
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if you wanted maximum braking, where would you sit?
mexico?
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#102
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if you wanted maximum braking, where would you sit?
Rick Onanian wrote:
wrote: Rick Onanian wrote: The unladen MTB has less inertia for the brakes to stop, so given that CoG, can probably stop in a shorter distance. No, that's not correct. The maximum braking deceleration is a function of the CoG position, not the maximum braking force or amount of work done. So, no matter how much you load a bike, if it's got the same CoG Any CoG on a given line that passes through the front contact point. then it can stop in the same distance? How far can you stretch that effect? Until the limiting factor is a loss of front wheel traction or inadequate brakes. Normally, of course, the argument here is that "all brakes are equally powerful"; that is because for most bicycles the forward tipover point (or the loss of traction, for knobbly tyres) always intervenes before the brake is not actually capable of exerting sufficient force (where the brake is competently designed and adjusted); but you'll note that Chalo Cholina has had to design special brakes to avoid this factor. -- David Damerell Kill the tomato! |
#103
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if you wanted maximum braking, where would you sit?
Mark Hickey:
While the front shock is compressing, the rear wheel will have a bit more weight on it which would help make up some of the difference, but still the end result is that there will be a very brief period where a front shock will delay the onset of "full braking". It looks likely though that this will only happen if the weight on the front fork is too light to start with, before braking; that is, the braking force from the front wheel will only benefit from weight transfer from the rear if the front wheel is on the verge of lifting or skidding at the start of braking. It will be interesting to see what maximum pre-braking loads the front wheel needs to have in order to start skidding upon braking, IF there is no weight transfer from the rear. This obviously will depend on rider weight and speed. |
#104
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if you wanted maximum braking, where would you sit?
David Damerell wrote:
that is because for most bicycles the forward tipover point (or the loss of traction, for knobbly tyres) always intervenes before the brake is not actually capable of exerting sufficient force (where the brake is competently designed and adjusted); but you'll note that Chalo Cholina has had to design special brakes to avoid this factor. And I need them now more than ever; because as of my last weighing, I have crossed the border into the land of the 400 pounders! I have a difficult time believing it myself. No wonder these steep Seattle hills seem so merciless! I took my drum-braked rain bike "on holiday" to Austin, Texas recently, where I reacquainted myself with two things: First, that the hills there are actually pleasant to ride on, being either gently sloped or very short; and second, that even on gentle downhills a big double handful of drum brakes is woefully inadequate to stop my ponderous mass in a reasonable distance. Chalo Colina |
#105
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if you wanted maximum braking, where would you sit?
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#106
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if you wanted maximum braking, where would you sit?
Rick Onanian wrote:
On 16 Jan 2004 15:10:38 -0800, (Chalo) wrote: sloped or very short; and second, that even on gentle downhills a big double handful of drum brakes is woefully inadequate to stop my ponderous mass in a reasonable distance. Is it possible to use drum brakes AND V-brakes together? Possibly using a cable Y-adapter or some such; and definitely using a lot of force on the brake levers. I guess, at least, you're able to get useful braking from the rear wheel. Chalo Colina -- Rick Onanian Because of tandem's greater rider/bike weight their greater weight there are special tandem bike levers pulling two cables http://www.gaerlan.com/bikeparts/par...kes/brakes.htm See the diatech levers - |
#107
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if you wanted maximum braking, where would you sit?
Rick Onanian wrote:
On Fri, 09 Jan 2004 10:52:59 -0500, Rick Onanian wrote: wrote: My trike [2] has two front brakes (Avid mechanical disc on each wheel - one lever for each brake) and no rear brake. Stopping quickly takes as Wow! Cool...fail-safe steering. Nevermind; I just looked at the picture, and it was the ONLY steering. Okay...Wow! Cool...integrated steering. Okay, on a second look, I think I see spindles and control arms. Do you steer with the brakes, with the front wheels, or with the rear wheel? What control do you operate to steer? Do you steer with the handlebars, which then aim the front wheels through control arms? -- Rick Onanian Here are some pictures of my Earth Cycles Dragonflyer (if the link is working). http://www.ihpva.org/incoming/2002/Dragonflyer/. Tom Sherman - Quad Cities |
#108
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if you wanted maximum braking, where would you sit?
Rick Onanian wrote:
Is it possible to use drum brakes AND V-brakes together? Possibly using a cable Y-adapter or some such; and definitely using a lot of force on the brake levers.... If the dropout spacing is great enough, an Arai drag brake could be used on a rear wheel in conjunction with a rim brake (found on several commercial tandems). I rode stoker once on a Bike Friday Tandem Twos-Day that had V-brakes and a front drum brake controlled with a Shimano bar-end shifter. Theoretically, a hydraulic rim brake and a hydraulic disc brake could be run from the same master cylinder and brake lever. Tom Sherman - Quad Cities |
#109
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if you wanted maximum braking, where would you sit?
meb wrote:
Because of tandem's greater rider/bike weight their greater weight there are special tandem bike levers pulling two cables http://www.gaerlan.com/bikeparts/par...kes/brakes.htm See the diatech levers - This is how all cycling forums posts look like to my newsreader, MT-Newswatcher. Can anyone suggest a fix? In response to meb: The double-cable levers have nothing to do with the tandem's weight. Their pupose is to allow a third brake, needed on many tandems ridden in hilly areas not to stop but to scrub off speed without thermally overloading the rims and tires. -- Ted Bennett Portland OR |
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