I put my Shimano Tiagra 4500 front brakes on a new frame, but with the fork, the brakes only reach the tyre and not the rim. Should I get a different kind of brake, or is just Shimano calipers not suitable then?
'''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Apparently your frame and fork require "long reach" calipers while "short reach" calipers are far more common these days and probably what you bought.
"Reach" is the distance from the center of the brake pad to the center of the rim's brake track and all calipers have some adjustment range. Short reach typically cover the range of 37 to 47 mm while long reach extend from 47 to 57 mm. Shimano and Tektro make long reach brakes in some models and it sounds like they are what you need.
BTW, there are some very long reach brakes available, as much as 80+ mm, but they are mostly for BMX and similar bikes.
too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
this is fairly common. Fork lengths vary based on the intended wheel size (27" vs 700c) expected tire size, fender clearance, or other considerations.
Brakes likewise vary in reach, which is measured from the center bolt to the rim (measured center to center). Apparently your new fork is longer than your old one, so you need new brakes with longer reach. Measure the reach you'll need and shop for a brake with the correct range. Typically brake reach is expressed as a range ie, 39-57mm, so the ideal brake will be one where the actual reach is the center of the range.