225/45 would be what most people would consider the "proper" size for a 7.5. A 235/40 would bulge a little too much for my liking. I'd run a 215/45 for just a bit of stretch, maybe a 205/45 if I was really into drifting. Staggered tires on same-width wheels (like 235 F and 205 R) is pretty silly though, not to mention you lose your ability to rotate them.
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