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I don't know where most people stand on this, but I've modified a couple of sets of Shimano dual pivot brake calipers before to achieve longer reach. I took a needle file and lengthened the slot on each caliper arm so that the brake shoe sat 1-2 mm lower. Intuitively it doesn't feel like the caliper arms lose any strength but I'm maybe not being cautious enough.
Ndeipi
I think 57 may be at the very limit, so it looks like I'd need Tektro R559.
They'd cost 40% of the cost of the bike, but it would be nice to be able to stop in a timely manner
thank you