all this talk of lowering seats and raised boots for short women who wish to ride a 250 reminds me of how the same issue exists for short guys in the motorcycle world:
when out shopping for gear for my wife both of us sat on a bunch of bikes to get a better idea of what feels right, what feels too big, etc. below are my thoughts just from swinging a leg over the following bikes (no actual riding took place ). i'm 173 cm/5' 8" for reference.
Triumph Street Triple: felt light and very manageable. 368 lbs, 31.5" seat height. (the Street Triple R isn't much different but there wasn't one in the showroom: 367 lbs, 31.6" seat height.)
Triumph Speed Triple: looked awesome with that short tail and single sided swingarm. also felt manageable but i could perceive its extra "bigness". heh. 416 lbs, 32.1" seat height.
Moto Guzzi Griso 1200 8V. long, not very tall, wide. felt a bit strange, actually. 489 lbs, 31.5" seat height.
BMW R 1200 GS non-A. felt tall, massive, but proportional. probably a bit much! 504 lbs, 33.5" seat height. i was up on my toes but could move the bike about reasonably easily, and could flat foot with one foot only if i shifted my hips.
BMW F 800 GS. also felt tall but perhaps within the realm of possibility. less wide than the R1200GS, surely. 455 lbs, 34.5" seat height.
BMW R 1200 RT. massive. felt like a low seat after hopping off the crazy-tall GS bikes. definitely bigger than i wish to go: i wouldn't want to catch that much weight at every stoplight, and at this point i'm more inclined to hop in a car for truly long distance touring. 571 lbs, 33.0" seat height.
BMW K 1300 GT. felt much like the R 1200 RT. bigger than i wish to go. pretty for sure, but oh so big. 635 lbs, 33.1" seat height.
BMW K 1200 LT. didn't even swing a leg over as it was on its centerstand in a corner. gold wing-esque huge. wow. not my bag at this point in the game. 853 lbs. 31.5" seat height.
yours truly:
i don't remember if this was the F 800 GS or the R 1200 GS. same difference.