Well, I was dead lucky and managed to get a short back to back test ride on an 18.5 and 19.5 today. Personally, I found the 19.5 a bit more confidence inspiring going down steps and off (smallish!) drops, and nice and stable/well balanced for carving turns – though I liked the 'flickability' of the 18.5, and it was a bit easier to get my hips over the back. I did feel a bit more sat 'in' the bike on the 19.5 – I guess due to longer wheelbase? Hmm..decisions decisions 😕 I guess I'm really going to have to think exactly what I want the bike for.
What I did find a bit odd feeling on both bikes was the stem, it felt really long. Noticed that someone has mentioned fitting a 70mm stem – sounds like a good idea.
Bloomin' brilliant bike BTW.