Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
you can do 305's.
I'm 3.25"/5" and had 305's, but went to 295's after a little too much rubbing that I couldn't get rid of. so with just a 2/3, 305's aren't a problem.
It also depends on your rims and their backspacing...
there my old U2 55 and the backspace is +30 (i think)