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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
doubleodavey-
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
What's the reach? Shimano 57mm dual pivots are good, if you need more than that you'll be looking at Tektro