Top Tube
effective ~55.0 CTC (center of seat tube to center of head tube - measured horizontally parallel to ground)
actual ~55.0 CTC (center of seat tube to center of head tube - measured along top tube)
Seat tube ~55.5 CTC (center of crank to center of top tube -measured along seat tube)
~56.5 CTT (center of crank to top of top tube -measured along seat tube)
~57.0 CTT (center of crank to top of seat tube -measured along seat tube)
Head tube ~145
For Reference: 1" head tube/ threaded steerer, 700C wheels, 68mm English threaded bottom bracket, 126x10 rear drop outs, 100x9 front, braze-on front derailleur, caliper rim brakes, mechanical group.