re: squeal on brazed-on centerpulls: Dear Steve,
In my experience, it is related to the amount of slop in the pivot and how much toe-in is required to offset that slop. Misalignment of the brakes make setup harder, too. The MAFAC brakes had a lot of play in their pivots--the plastic bushings were worse than the brass ones given the deformation under load, but harder to set up given that you have to offset the extra deformation when toeing the brakes in. Once toed-in appropriately they all seem to play well. My Alex Singer was toed-in by the builder, and never made a peep; my René Herse brakes howled until I (who assembled the bike) took a crescent wrench to the arms. My brother's Kelpie (Dia-Compe 610s) required no modification at all to be silent. The Paul brakes have a fair bit of play in their adjustable pivots, and required an exaggerated toe-in to (mostly) eliminate it. The sticky Salmon pads don't help (but improve ultimate braking capacity). The Compass brakes have less play in the pivots than do any of the MAFAC, Paul, or Dia-Compe/Weinmann brakes I've had to mess with, and, assuming the pivots are properly brazed (the tolerances are tight for brazed-on centerpulls vs a cantilever brake), they don't squeal. The two Boulder Bicycle centerpull setups with which I've been directly involved were silent out of the box, but neither required any work to get the pads parallel to the rim under hard braking, either. Toe-in adjustments on any of the historical/repro brakes is a hassle--filing the mounting washers or cold-setting the arms--but results in a quiet brake, eventually. I am on the fence whether it is worth it vs a properly set up cantilever. For short- and medium-reach systems, they're a (big) improvement. For the long reach brakes, brazed-on centerpulls are better than their dual-pivot competition, but vs a cantilever? It is a hard call. Best Regards, Will William M. deRosset Fort Collins, CO Best Regards, Will On Friday, June 3, 2016 at 7:54:54 PM UTC-6, Steve Palincsar wrote: > > > > On 06/03/2016 09:40 PM, ted wrote: > > Tim, > > Just thought you may want to look into the options, not recommending a > choice. > > The Paul and compass pads/holders are not interchangeable, the slots in > the brake arms are oriented differently. Look at pictures of the Paul racer > m model to see the difference more clearly. > > Compass / Raids use what we now know as the smooth-post cantilever pad > (Mafac originated that design and everybody else copied it) while the > Paul Racers use the thinline threaded V-brake style pad. > > > > Regarding squeal I've read conflicting reports on the raid/compass > brakes. Some say some say they have lots, others say not a problem. > > I believe both the Paul and compass brakes have their adherents. > > Precise location of brazed-on posts can have a lot to do with whether > the Compass/Raid squeals or not. > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at https://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
