Biggest tire sizes for front and rear of a 2012 Wide glide without changing stock parts. I want a slightly fatter tire on my 21 in front wheel and a slightly fatter tire on my 17 in rear wheel...even one size fatter I'd be happy, any experience and feedback about fit or chafing issues is appreciated.

 

You can go to a 90/90-21 on the 2.15" front easily;. You may have to re-adjust the front fender slightly, but a 90/90 fits the front wheel. Note, if you do need to adjust the front fender for a 90/90 tire the mounting hardware isn't metric

If you're still running the OEM rear wheel it's a 17". Not too may tire options there; the stock wheel is 4.5" and a 180/60 is about as large and you'd want to spoon on a 4.5" wheel...

 

17 is correct you're right my bad, thanks for the response!