I am building up a Spa Audax frame and I thought I had all the parts I needed but those pesky Spa people decided to give their frame enough clearance for decent mudguards which means the standard drop calipers are too short.
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What is your budget? I run TRP 957s on my Audax bike which are excellent but pricey new.
The other best options in my opinion are the Velo Orange Grand Cru and Shimano BR650s.