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@quickerbybike
I've found some 105 calipers to replace the (useless) Veloce calipers on my bike. Frame is Affinity Metropolitan.
The locknut at the back of the Campy calipers had a flat top and bottom, so even though the drilling in the fork is close to the underside of the headset, there was room.
But the shimano caliper has a round (12-point, 13mm) locknut and it completely fouls the bottom of the headset.
This must happen a fair bit on track bikes. What's the answer?
File down the locknut? But how would I get it on and off then? Not that I'd ever need to.
Put a big (4mm?) spacer between the caliper and the frame? Use what?
Any ideas would be great.
Martin