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The easiest way to get the correct contact patch is to lower the air pressure, but it is not a good idea to go below 28 psi if you do a lot of highway driving. I work part time in the Bj's Wholesale Club tire center (if anyone here has ever heard of it, it's like Costco or Sam's Club if you've ever heard of those) Anyway, what I usually do when someone want's tires mounted on too small a rim is I just explain to them any drawbacks that result from it (ones stated by PASmokeeater) and tell them what air pressure to maintain. Tire shops/centers are not held responsible for incorrect tire size due to the papers they have you sign when buying/mounting the tires. If you read the fine print it usually says that the customer is reponsible for correct tire size, air pressure, etc. So I don't see why they should've refused to mount them. 12.5s on 8 inch rims would fit just fine at the right air pressure but I would definitely recommend 10 inch.
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