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3 thoughts:
1) You didn't tell us what you took off. It is quite possible you selected a tire that was worse for RR. On the other hand, the tire you selected probably has better treadwear and traction.
2) Be aware that even if you replaced with identical tires, your fuel consumption is going to go up. New tires have worse RR than worn tires.
3) The difference in tire size is not different enough to result in a change in RR.
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