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@number6
whacking this here largely so i can refer to it as a link , to save me the time on the seat post size / top tube debate during sales here and elsewhere.
the bikes behind are identical in geometry and set up. but could be built as old 40s/50s style oversized frame or compact frame with no change in the position of feet, bum and hands.
sure there maybe some differences (for eg. long seat post may give more flex - compact maybe lighter , the oversize might get you in the knackers (standover too high) or one may or may not subjectively more pleasing aesthetically , - but for position - no difference)
so vastly different ''frame sizes'' (seat tube length) can give the same 'top tube' (virtual) length, wheel base, steering angle
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