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be aware those brake levers are make for canti brakes rather than caliper
Are they? Description says they're for calipers.
Q&A:
Q: What is the best type of shimano brake calliper to use with brake levers. Just building up a flat bar bike at present.
A: This lever is compatible with road cantilever brakes and road caliper brakes.
Shimano 105 5700 Road Brake Caliper
Shimano Ultegra 6700 Road Brake Caliper
Shimano CX50 Cantilever Brake
be aware those brake levers are make for canti brakes rather than caliper, so they won't be that strong with caliper brakes.