the width from the back is only a miniscule difference, promise, you wont even be able to tell. a lot of poeple say theyre going wider just to look cool, but then are surprised when you cant even tell a difference. and it WILL affect how it dives into corners. will take some getting used to, but then again if youre not cornering a ton and just cruise riding you wont feel a gigantic difference there either. i always tell people im not paying all that extra $$$ for a 190 or 200 but if its cheaper, its probably a breakeven kind of thing
i also think 180 is completely sufficient
so basically, IMO it will effect cornering ability and take getting used to
and you wont even notice the difference just by eyeballing it
so why bother at all?