Have you driven a Box with 18's? If not I suggest you do because the ride is VERY MUCH firmer than your 16's
I have just changed back to 6 & 7 x 16 from 7.5 & 9 x 18 because I now drive a lot on rougher sealed roads and found the 18's were trying to shake the car apart not to mention the degraded steering at higher speed.
The 16 dramatically improved everything and in fact unless you are driving " in extremis" I doubt you will detect much difference in roadhandling.
I will keep the 18's for when I sell the car.
Cheers,
Glenn
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