Could someone please explain why on most older road frames the rear brake drop / clearance is much bigger than at the front?
This makes no obvious sense and means that the front and rear brake calipers are in some cases different models - I have used a medium reach record on the rear of my Mercian and a short reach on the front. This meant buying two sets of calipers to make one good pair!
On my Carlton, I have had to file out the rear caliper to give me an extra 5mm drop whilst the front brake is set at minimum reach....
On more modern frames this is not the case so surely there can't be a technical reason for this?
Mercian King of Mercia Road 1980
Carlton Super Course 1980, Keith Coppell 1981
Colnago Dream 2000, Ribble Audax
GT Zaskar LE