I've only tried the 245's.
I'm not sure how much of a difference the gearing actually makes. If you plug all the numbers in a gearing calculator, the 245 car is at 2500 rpms at the same speed where the 255 cars are at 2470 rpms. And I could very well see the wider tire keeping you bit higher in the power band.
With that said, the 255 is at least a lb heavier and I think that is a bit of a deal. And the 245 probably feels better.
Quote:
Originally Posted by Breezio
Little bit of anecdotal information. A friend of mine has a '14 BRZ, we are both STX prepped (mine is a '17)
He has a better tune, dyno'd both cars same day same dyno, his makes 19HP more.
His car weighs 95 lbs. less then mine.
He runs 245's, I run 255's.
We did a 1st and 2nd gear pull. cars were practically dead even.
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What you would really need for a meaningful comparison is a pair of cars with the same final drive (so both 13-16 cars) doing a 2nd gear roll from a gps speed like 25mph.