drousseau33, If the bike has vertical rear drop outs, you've exceeded your maximum tire size. If it has horizontal drop outs you maybe able to slide the hub rearward enough.

Bicycle wheels and tires are rarely perfectly round as there's often a 1 or 2 mm deviation. For vertical drop outs you can try finding where the most clearance is and rotating the tire on the rim to where the least clearance is...iffy at best.

Brad