I couldn't car less.
Join Date: Nov 2003
Bikes: Ritchey P-series prototype, Diamondback, Nishiki Triathelon Pro.
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I am 'supposed' or 'fit' 17, 17.5 or 18. Doesn't matter the seat tube hight, am 5-9 also.
Its the extension of the body or the toptube. this can be correted with your stem.
(not by sliding the saddle back)
a 16 seattube 20 inch toptube. You use the overpowering of the frame size diff (smaller) to your advantage. Some stuff is downright dangerous if the bikes to big, uncomfortable perhaps on a small frame- but very do-able.
On incline toptubes its the reach AND if you want to get tech- if you override size wise you lose the seat/bb inline pedal stroke. Does't matter so much if your freeriding/ jumping, but ride 20 miles and you want that seat up and correct leg/ bb action. F-your knees bad, seat to low and off the bb.
Sorry I'm not more helpful, should work as the type of frameworks is inclined.
Got short arms? That will help.
My 16 is like a bigger bmx, built it up that way.
Good luck with your decision,>Jef.