Tires 2015 AutoX season

cruzthepug · 12-17-2014, 12:30 PM

Just place my order, fronts 18x9 - 42 and the rears 18x10 - 25. I ask again about brake clearance and was told that 42 was the absolute max offset to clear the sport brakes.

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stuy486 · 12-17-2014, 02:26 PM

Quote:

Originally Posted by glw

Jeff, I believe it was you.. so, I guess that would mean semi-concave 18x9+47 for the fronts and deep-concave 18x10+30 for the rears... or would something out to 18x9+40 and 18x10+23 be a better choice?

Tirerack seems to have the 285/35-18 in stock. I'm going to check with Corner3 when the time comes since they are local to me...

Well, Cruz just said that Forgestar told him +42 is the highest they can go to clear. You want the wheels out as far as possible, so +40 and +23 are the values you'd want to maximize performance since you're moving the wheels outboard a bit.

cruzthepug · 12-17-2014, 02:36 PM

With 47/30 being the stock offsets (touring with 19") and the rules allow up to 6.35mm difference, I ordered 42/25. 40/23 would actually be out of spec.

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stuy486 · 12-17-2014, 07:59 PM

Quote:

Originally Posted by glw

Hmm... I saw the change proposal to make it a full 7mm - bottom of page 7 (#13851). I'm not sure if it was ever officially adopted though.

http://scca.cdn.racersites.com/prod/...-june-solo.pdf

It's under the "Tech Bulletin" heading rather than the Change Proposal heading, so I think that means it's a done deal.

And at the top of the Fastrack it says that unless otherwise noted, changes are effective 1/1/2015.

cruzthepug · 12-18-2014, 05:48 AM

You guys using 285 R-S3's, what air pressures you running?

The ruling on the offset change does not effect my choice of +42 for the fronts, using a 285 I was concerned about getting too far out and rubbing. If I was going 275, then +40 for sure.

stuy486 · 12-22-2014, 05:43 PM

Quote:

Originally Posted by cruzthepug

You guys using 285 R-S3's, what air pressures you running?

41-43 front, 33-36 rear.

I think at nationals I was running 43-34

cruzthepug · 12-22-2014, 05:45 PM

Quote:

Originally Posted by stuy486

41-43 front, 33-36 rear.

I think at nationals I was running 43-34

That's about the same as I ran with the RE-11's this year

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12-17-2014, 12:30 PM	#16 (permalink)
cruzthepug Base Member Join Date: Feb 2014 Location: Huntsville, AL Posts: 245 Drives: 2014 370Z Touring Rep Power: 11	Just place my order, fronts 18x9 - 42 and the rears 18x10 - 25. I ask again about brake clearance and was told that 42 was the absolute max offset to clear the sport brakes. Sent from my iPhone using Tapatalk __________________ Ark Performance / Eibach / Forgestar (CF10's Daily, F14's Race)/ Project Kics / K&N / Z1 / TWM Performance / RJM Performance / Koni / Hawk Performance

12-17-2014, 02:36 PM	#18 (permalink)
cruzthepug Base Member Join Date: Feb 2014 Location: Huntsville, AL Posts: 245 Drives: 2014 370Z Touring Rep Power: 11	With 47/30 being the stock offsets (touring with 19") and the rules allow up to 6.35mm difference, I ordered 42/25. 40/23 would actually be out of spec. Sent from my iPhone using Tapatalk __________________ Ark Performance / Eibach / Forgestar (CF10's Daily, F14's Race)/ Project Kics / K&N / Z1 / TWM Performance / RJM Performance / Koni / Hawk Performance

12-18-2014, 05:48 AM	#20 (permalink)
cruzthepug Base Member Join Date: Feb 2014 Location: Huntsville, AL Posts: 245 Drives: 2014 370Z Touring Rep Power: 11	You guys using 285 R-S3's, what air pressures you running? The ruling on the offset change does not effect my choice of +42 for the fronts, using a 285 I was concerned about getting too far out and rubbing. If I was going 275, then +40 for sure. __________________ Ark Performance / Eibach / Forgestar (CF10's Daily, F14's Race)/ Project Kics / K&N / Z1 / TWM Performance / RJM Performance / Koni / Hawk Performance

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