I have tried many different width tires on different width wheels. IMO, a slight stretch is better than too wide of a tire. I am running 245's on 9" wheels. I tried 245/40/17 MPSS on 17x7.5" +38 wheels. The tires were pinched.
If you stay with the Rivals, 245/40/17 is the next size up. I would not suggest it. I would stick with a 225/45/17 for your 17x7.5 +48 wheels.
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