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It is hard to say, as it is all very subjective, but for me, the improvement seems mainly in the following areas:
1. Turn-in seems more precise
2. Mid-corner the car seems just a bit more 'set' - more stable, composed and predictable on limit.
With the same suspension settings, I got much better heat distribution on the tyres. More consistent heat across the tread means more grip and even wear. One the narrower rims, the outer edges would wear significantly faster than the rest of the tyre. I've been running the wider rims only for a few events so far, but wear seems to be more even.
Overall, I just feel more confident with the car. I would definitely do it again.
A friend of mine made the same change late last year. He felt a huge improvement and thought that it felt like a different car. Very confidence inspiring, and just much nicer to drive through corners. He was running the same sizes, but using the Hankook twin-groove tyre.
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