Originally Posted by John E
There are two generally-accepted ways to measure frame size:
1) center of crankshaft, along the seat tube, to the center of the top tube;
2) center of crankshaft, along the seat tube, to the top of the top tube.
...and the Raleigh Standard, my favorite method of sizing:
3) center of bottom bracket/crankshaft, along the seattube, to the top of the seattube lug opening (not including any fancy spearpoint lug extensions)
-Kurt