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This is still a full size spare. Even though you may have an 18 or a 20 inch wheel the overall circumference of the tire is still the same. A 17 inch Silverado wheel has a 265/70 r17 tire and the 18 inch wheel has a 265/65 r 18 tire. There is no difference in the height of the vehicle off of the ground. It is perfectly safe to drive on the spare for however long you want to, and at whatever speed. Every car company out there does this because there is no point in putting a fancy alloy wheel under the bed of your truck so that it can just rot away.Report it
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