s2000Junky

The 245 will have a more desirable profile, but if ultimate grip is what your after then 255 makes sense, as long as your factoring in consistent tire compounds. The rubber makeup plays just a much a part if not more then the width of a tire, certainly if comparing just 10mmm difference. Both tires are within the 9" wheel recommended width. The 255 is going to be pretty square and have a little less response, wile the 245 will have that slight desirable stretch. But that’s given the same tire brand/manufacture. Obviously if you throw on a single ply sidewall 245, compared to a dual ply sidewall 255 on the same width rim, its likely the wider 255 is going to deflect less and provide more firm response. So you got to look at it from all factors and weigh out the compromises.

andrewhake

Yeah this was what had me concerned about my setup on the OEM wheels. Seriously has me wondering if I am better off with the standard 215/245 on the track.

I went from the S-04 at 215/245 to RE-11 at 225/255 and definitely still noticed increase response overall. I may switch back to 215/245 for my next set. Might be more efficient as I am sticking to stock alignment until I hit certain lap times at Laguna and Thunderhill.

s2000Junky

Excellent example! and great cam angle. You might want to move that zip tie from your exhaust mount though if you want your pipes to stay in one place, that thing was really moving around You can really see the difference in tire movement on the 255. Clearly the narrower and lower profile of the 235 is going to provide more precision/feedback. Grip is the compromise and this gets back to providing the best rim width for the width tire wanting to be run.

s2000Junky

If you can pick a tire that has a stiff enough sidewall (Like most the Bridgestone family) You could likely get away with running a bit more rubber wile retaining the response on a otherwise narrower less stiff tire. Higher tire pressures can help as well.

andrewhake

Gotta love videos like these!

I found it really interesting that even F1 tires have a noticeable deflection that can even be seen at speed if you are really paying attention. Even with the incredibly stiff sidewalls they likely have, the deflection is still pretty clear to see with their giant sidewalls.

I can't wait to pick up a Hero3 so I can shoot some videos like these at higher frame rates!

s2000Junky

You cant lose by running near the same rim width as tire section width ie; 10" rim for a 255. 9.5" on a 245. 9" for a 235 etc... That is going to be optimum but not always logistically practical. Something to aim for though.

psychoazn

CR suspension is on the bumpstop at quite a few places...

boyguan

I think I'll go down to a 245 non stagger vs the 255

If someone wants to trade we can do that

GT Motoring

For reference, most of the TTC s2k guys Ive met running a 225 A6 are doing so on a 9" wheel.

oinojo

^the hoosier 225 meaures out closer to a 240-245 width street tire. Also kinda maks sense that Bridgestone did not oversize their 255 re11