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My friend and I compared the RIAL X10-i (What you have, and what's also on my car for the winter tires), with the stock aerodynamic 19-inch wheels that come as part of the mega/dekka world (or the OEM winter tire package), for geometry, size, etc. We found that they were basically identical. I checked my speedometer against one of those speed-check signs and it's the same before and after the 20inch to 19inch wheel swap. You're good to go!