Originally Posted by
SJX426
I know what range of frames fits me, 58 to 61, with the ideal about 59. The bikes that fit are in that range so if I know if the ST is measured is either ctt or ctc, I can judge if it will be in my range or not. If it is on the border line of the range and does not ID ctc or ctt, it is not in the running.
If Napoleon said a 57 is extra large, I would say it is a medium. To many adds stating s, m, lg, etc. that doesn't tell me anything.
That won't work for many modern road bikes and few if any mountain bikes. Unless I'm misunderstanding what you are saying.
It also ignores that the top tube length and or frame reach can be significantly less or more and still have the same seat tube length. Which is probably part of the switching to letter sizes by some of the manufacturers.
I suspect they are trying to overcome the weight of people still thinking of sizing from the days of bikes with perfectly horizontal top tubes and a head tube that grew in length as the seat tube grew.