Originally Posted by El_Tortuga
Not a big difference, but if I'm doing my math right, 235/50/18s are about 27.25" OD, and 275/40/19s are about 27.7" OD. You've got a little taller tire = slightly taller gearing.
Now if I'm the other guy, I'm claiming better driving. 
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Correct. But even then the difference in tire height only makes a 100-200 RPM difference at the top of the gears, which is very small, but maybe just small enough to shift earlier for Jay. Not to mention heavier wheels on my end, so I think his car could just rev up slightly quicker than mine.