always the best plan On Friday, February 20, 2015 at 2:54:52 PM UTC-8, Mark Reimer wrote: > > Ok. I'm out of my element. Going riding > > On Fri, Feb 20, 2015 at 4:52 PM, ted <ted....@comcast.net <javascript:>> > wrote: > >> Mark, >> >> From the BQ writeup you cite >> >> The angle of the straddle cable also af- fects the mechanical advantage. >> A low straddle cable means that the pads travel less for a given brake >> lever pull. Less travel means more power. >> and >> >> Unless the straddle cable is at a right angle to the brake arm, the >> effective length of the brake arm is shortened, which in turn reduces the >> braking power. >> >> The first is pretty straight forward, but the second overlooks the fact >> that, for a given brake, the tension in the cable changes when you change >> the angle. As you raise the angle towards 90 you reduce the tension which >> counteracts the increase in "effective length". >> I think its much simpler to work out if you decompose the cable tension >> into vertical and horizontal components and stay away from notions like >> "effective length". >> >> On Friday, February 20, 2015 at 2:25:28 PM UTC-8, Mark Reimer wrote: >>> >>> Deacon, >>> >>> I agree with you on this. Getting the straddle as close to 90 degrees >>> has always been the position which yielded the greatest stopping power for >>> me. With my neo-retro's (Aka the 'weaker' of the paul canti's) I have the >>> cable long and up high, and I have enough power to lift up the back wheel >>> if I really wanted. >>> >>> Lower straddle usually results in less power, and obviously less mud >>> clearance as well. >>> >>> As I understand it, the idea is to get the cable as close to 90 degrees >>> as you can WHEN the brakes are in contact with the rim. >>> >>> To read a much more exhaustive explanation than I'm willing to >>> regurgitate, take a look at BQ's great write-up on setting up canti's. >>> >>> In the end, I'm sure we can all agree that Paul canti's are awesome. >>> >>> On Fri, Feb 20, 2015 at 4:18 PM, ted <ted....@comcast.net> wrote: >>> >>>> Deacon, >>>> >>>> I am glad that you were able get your brakes to work the way you want. >>>> I suspect you were told the opposite of what I am telling you, and that >>>> you >>>> understood what they were saying. Sadly they told you wrong. But happily >>>> they still steered you to something that worked for you. >>>> >>>> The phrase "slushy brakes" suggests to me low effort producing large >>>> brake lever travel with little braking effect. If that's what you had it >>>> was likely due to elasticity in the brake system, which is a separate >>>> thing >>>> from leverage. If you experience that sort of thing, look for what moves >>>> when you squeeze the lever hard after the pads hit the rim. For example, I >>>> found the steel front cable hangers flex a lot. Replacing mine with the >>>> aluminum ones improved the feel of my brakes significantly. Cables that >>>> change shape as the brakes are applied can be another source of excess >>>> travel. >>>> >>>> >>>> On Friday, February 20, 2015 at 4:21:44 AM UTC-8, Deacon Patrick wrote: >>>>> >>>>> Ted, et al engineer types: I happily bow to your knowledge on the >>>>> angles and leverage, though I was told the opposite (as I understood it) >>>>> before I made the change. Interestingly, either way, the experience went >>>>> from slushy brakes (short saddle cable, < 90˚ intersection with the brake >>>>> arm) and salmon pads, to passable strength except in single track steep >>>>> descents (long saddle cable, close to 90˚ intersection with the brake >>>>> arm). >>>>> But that point is mute now, as the Paul's are wonderful! I look forward >>>>> to >>>>> snow-free trails so I can try them out! >>>>> >>>>> With abandon, >>>>> Patrick >>>>> >>>> -- >>>> You received this message because you are subscribed to a topic in the >>>> Google Groups "RBW Owners Bunch" group. >>>> To unsubscribe from this topic, visit https://groups.google.com/d/ >>>> topic/rbw-owners-bunch/5HXsqAEXrWM/unsubscribe. >>>> To unsubscribe from this group and all its topics, send an email to >>>> rbw-owners-bun...@googlegroups.com. >>>> To post to this group, send email to rbw-owne...@googlegroups.com. >>>> Visit this group at http://groups.google.com/group/rbw-owners-bunch. >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> >>> -- >> You received this message because you are subscribed to a topic in the >> Google Groups "RBW Owners Bunch" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/rbw-owners-bunch/5HXsqAEXrWM/unsubscribe >> . >> To unsubscribe from this group and all its topics, send an email to >> rbw-owners-bun...@googlegroups.com <javascript:>. >> To post to this group, send email to rbw-owne...@googlegroups.com >> <javascript:>. >> Visit this group at http://groups.google.com/group/rbw-owners-bunch. >> For more options, visit https://groups.google.com/d/optout. >> > >
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