That your frame has mudguard eyelets suggests it was probably intended to be built with mudguard clearance on 700c wheels, and 47-57mm reach calipers. These "standard reach" calipers were common in the days of single pivot brakes, but harder to get hold of when dual pivots and "short reach" became the norm.Hallsy":1slytxi1 said:They are Exage 500 brakes, 39-49mm drop, looks like I need around 55mm drop.