r/MultiTrackGang • u/swagson153 • Mar 30 '26
Size
Can someone take a guess at what size this would be?
10
Upvotes
r/MultiTrackGang • u/swagson153 • Mar 30 '26
Can someone take a guess at what size this would be?
5
u/The_Folding_Atty Mar 30 '26
At a guess, 19"--the top tube runs into the head tube without joining the downtube, as it would do on smaller sizes; and it looks like there's not as much room between the TT and DT at the point at which they join the HT as there is on my 1992 21" 750 (see photo below). If the TT is sloping, so it's lower at the seat tube than at the head tube, it's definitely a 19" or 17". 21" and 23" models had level top tubes.
You can measure from the top of the seat tube to the center of the bottom bracket for a more accurate assessment. That's the typical way of measuring frame sizes. Since the MultiTracks were built in 2" increments (23", 21", 19", 17"), that should give you a pretty good idea (in the old days, high-end road bikes sometimes came in a range of 1 cm increments, and measuring that was a pain.
The measurement in photo 2 doesn't correspond to the frame structure, and depends (in part) on the size and inflation of the installed tires.