When we were young and beautiful, bicycles came in a wide variety of formats.
Just as today!
The standard lengths for brake cailpers go back a long way
and single pivot calipers remain available at a moderate price

from $14.95 each
Front or Rear with standard nut.
all lengths

Brake Caliper Reach Table, mm
• Modern 450 caliper 39~49
• 450 are not available in this style brake
• use modern Dual Pivot caliper
• Classic 500 sidepull 43~57
• Classic 730 sidepull 53~71
• Classic 810 sidepull 61~79
• Classic 990 Sidepull 71~89
• Classic 1000 sidepull 76~100
• All above classic sizes in stock $14.95 front or rear
• Obsolete 1080 sidepull were 84~108
• Many lengths available in modern Dual Pivot calipers