Dave,
I like your idea of rear reach. Something I was pondering a while ago was % rear offset - horizontal distance from top of seat (at seatpost centre line) to BB (at a seat height typical for the rider size applicable to the frame size) as a % of chainstay length. This takes STA / ESTA out of the equation as it will give an idea of wheelieability as a % across sizes.
This does assume FC / RC is correct (which I see as a fundermental to bike geo).
Aug. 6, 2021, 12:09 a.m. - fartymarty
Dave, I like your idea of rear reach. Something I was pondering a while ago was % rear offset - horizontal distance from top of seat (at seatpost centre line) to BB (at a seat height typical for the rider size applicable to the frame size) as a % of chainstay length. This takes STA / ESTA out of the equation as it will give an idea of wheelieability as a % across sizes. This does assume FC / RC is correct (which I see as a fundermental to bike geo).