Originally Posted by
megalowmatt
But the Motobecane Lechamp is not a true 51 - in fact the effective top tube is what would be considered a medium size in other brands. That's what I wanted to point out with my earlier posts...her CC numbers have her on a bike with a 49-50 ett. The frame she is looking at (the Lechamp) is a 54 ett. It's always difficult ordering online and I wanted to try to point that out to help in the decision.
The Windsor you referenced has what looks like to be a horizontal top tube (there's no geometry chart - just a "sizing tips"), which would make the sizing true to size.
Anyway, I hope this hasn't made it too confusing
I understand what you're saying. And it makes sense, since the tube is sloped.
I had emailed Moto to get the top tube length (because I am an idiot and didn't noticed it on the chart when I looked at it) and the sales guy, Chris, asked for my measurements. So, I sent him the inputs from the compcyclist calculater (not the outputs, just the inputs). He suggested the 48. But who knows if he's just a salesperson or if he's a bike expert, also?