Quote:
Originally Posted by BackOnBlack
Thank you guys for trying this out and sharing your findings 
The part I would like to seek your opinions on, or factual findings, is whether 305s on 10.5" wheels would actually provide improved grip.
Maybe the objective is different and it is more about going square setup with the largest possible tire, and not necessarily increased grip.
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I think 305 became the target partly because of the availability - particularly in the SC3R which are an absolute bargain for their performance. The other dynamic at play is the amount of room on this platform on 19" square. We're on this awkward cusp between 30 and 35 series tire where 305/30 is .5"ø smaller than stock, 295/30 is .7"ø smaller, and 295/35 is .4"ø larger thus more likely to rub.
285/35 on 10.5" is a great choice - especially for stock camber - and probably offers the best stock-bias compromise for a square setup.
305/30 on 11" is a mod-bias compromise in that it requires a setup that is much more aggressive than stock and not ideal on the street.
So, it's a mix of tire size availability/price/performance relative to the geometry of our platform and the owner's propensity to go all in on an aggressive suspension setup. With that said, I have no idea how 305 at the min limit of 10.5" compares to 305 on 11" and agree wider is not always better - but we are limited in our options. Reminds me of this video which helps sort out some of these details.