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235 should fit fine but 245 will make the side wall bulge a little bit!! my friend has 235's in his 7.5 inch rim and they look a little on the bigger side!!
the best for 7.5 is 225. you can put 235, 245, or 255 (i have done it before),if you want but what's the point? it won't handle the way it suppose to be.
What is the largest tire size you can put on a 18x7.5 rim?
