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Shimano cantilever BR-M732 asymmetry
Last weekend, I installed Shimano cantilever brake BR-M732, which is
sometimes called 'XT2', or 'XT-II" as I understand it. I found that the arm with secondary spring tension adjustment has more drag at the pivot than the other arm. This causes the two arms to respond asymmetrically when the brake cable is pulled or released. The drag appears to be integral to that cantilever arm; different greases and lubes on the brake bosses did not correct for the differential. Loosening or tightening the pivot bolt had no affect. Unequal left/right spring tension and/or straddle cable length do not directly address this problem. With some Googling, I found a post referring to this issue: http://tinyurl.com/6273n, or http://groups.google.co.uk/groups?hl...%40crcnis1.unl. edu Has anybody else here experienced this? Did Shimano make a running change to the 732 to correct the issue? Does the 730 have the same problem? Thanks, Nicholas |
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Nicholas Grieco wrote:
Last weekend, I installed Shimano cantilever brake BR-M732, which is sometimes called 'XT2', or 'XT-II" as I understand it. I found that the arm with secondary spring tension adjustment has more drag at the pivot than the other arm. This causes the two arms to respond asymmetrically when the brake cable is pulled or released. The drag appears to be integral to that cantilever arm; different greases and lubes on the brake bosses did not correct for the differential. Loosening or tightening the pivot bolt had no affect. Unequal left/right spring tension and/or straddle cable length do not directly address this problem. Has anybody else here experienced this? Did Shimano make a running change to the 732 to correct the issue? Does the 730 have the same problem? This is not likely a flaw in the cantis, more likely a flaw in the frame studs. Sometimes they can get bulged out near the open end from overtightening of the bolts, sometimes they're imperfect in other ways. This can often be corrected by careful use of emery paper or a file. Also, those cantis have a two-position spring setting (on each side.) One of the positions is labeled "SLR." This is the lower-tension setting, for use with brake levers that incorporate their own return springs. The other, stiffer setting is for older brake levers that relied on the canti springs alone. I have a detailed series of Web pages on this, but now that I look, it appears that I neglected to place a link to them anywhere on my site. See: http://sheldonbrown.com/harris/canti...rs-xt2-02.html Sheldon "Oopps!" Brown +----------------------------------------------------+ | The two most common elements in the Universe are | | hydrogen and stupidity. --Harlan Ellison | +----------------------------------------------------+ Harris Cyclery, West Newton, Massachusetts Phone 617-244-9772 FAX 617-244-1041 http://harriscyclery.com Hard-to-find parts shipped Worldwide http://captainbike.com http://sheldonbrown.com |
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