The first time I went bike shopping in real bike shops, I was sold a 13" frame women's design. I'm 5'2. Short legs, long torso. Noone should ever sell me a WSD. I very spottily used the bike because it just didn't feel right hwenever I got it, and then I sold it on craigslist and bought a used bike to replace it. And I've never bought a bike in a bike shop since.


So if what you're riding is a mountain bike, 15" is probably about right for you to have standover clearance. My mountain bike now is about a 14".


If you're talking about road bike sizing, a 15" is small. My smallest road frame is a 44 cm which has too short of a top tube for me, and I usually ride about a 48 cm. I can ride a 50 cm.


But you can put longer and higher angle stems on bikes, you can switch out the handlebars to a different type that provide more reach, etc. You could put a setback seatpost on it - you put a brooks saddle on - I think those have short rails and may be contributing to sizing issues. My 44 cm frame which is too small for me has a 130 mm high angle stem on it, a setback seatpost and the saddle all the way back on the rails, soma sparrow handlebars and it's fine. It has a steeper seattube angle than I like, but I can ride it without problem.