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Looking at the 2 tires in question - the 15" is an H rated tire and with an 88 Load Index. The 17" is either a V or W rated tire with an 87 Load Index.
So not only is the 17" ever so slightly smaller in load carrying capacity - which would adversely affect RR, , it is likely that the 17" has higher RR due to the things needed to make the speed rating - like cap plies.
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