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Visually, the tires would bubble out from the rim slightly less (0.2 inches) than on a 8.5" wheel. This is referred to as the section width (the widest part of the tire). See diagram: 
Despite the fact that the section width is 0.2" more narrow, the contact patch ... the part that actually matters and serves as the friction surface for torque transfer remains identical under load. The only time that it would be less is if the tire is overinflated or off the car (no load). So, I'm not sure what you mean by footprint, but the "performance" aspect of the wheel would be no different than if it were placed on the stock 8.5" rim.
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