Then ill stand corrected

I ran a wheel/tire combo that was identical front and rear in diameter, and after an hour or so of highway driving (~80mph) i got the diff overheating issue. Widened my rear wheels to 12" and went to 325s.. no problems since!

 

Another vouch for Michelin Pilot Super Sport 245/30R20 front and 325/25R20 rear

 

None of you guys have been warned about the load rating on these tires being wrong for the 997 cars? I was told just this morning Discount tire wouldn't sell me these tires because the load rating is 101 on these and my car requires a 102 load rating.

 

did some digging after our discussion.

101 has a load rating of 1819#
102 has a load rating of 1874#

Curb weight of a 997 is 3400#

http://www.tiresplus.com/shop-for-ti...d-index-chart/

Not sure why they are concerned.

 

Then go to a tire shop who knows what they are talking about !

In your doorpost there should be a sticker with tire info.
You can see there that the adviced rear snow tire size has a 99 load rating.
If 99 is allowed you'd think the tire shop would know 101 is too , no ??

In case you do not have the sticker anymore :

http://rennlist.com/forums/997-turbo...997-turbo.html

Btw, 101 = 825 kg per tire, 102 = 850 kg per tire.
Negligible difference for a car weighing around 1600 kg.

 

What if I wanted michelins, and I couldn't source 325/25/20 rears, what would My best option be with 9 front and 11 rears?

 

Thank you guys for the info!!! I was honestly floored by their stance on the issue.

 

A 235/30 and 305/25 Michelin will run a lot chunkier/bigger then a Nitto. Can you source the sizes you have now in michelins?

 

I can in PS2's.
Woild Michelin 305/25/20 and 235/30/20 work?

Thank you

 

Resurrecting somewhat an old thread here.

Want to ensure I have the correct offset as I may be experiencing some bump steer.
I'm running: 245/30/20 (20x9) and 325/25/20 (20x12)

Want to confirm that the OEM offset, on OEM 19's is...
Front: 55, Rear: 50
Correct?

Which means, for the 20" tire and wheel sizes above, I should be running offsets of:
Front: 50 and Rear: 46

 

Wheel offset wont effect bump steer.

 

Right now I'm lowered and running 7mm spacers up front, so at high speeds I feel like I have an issue with bump steer. Just want to confirm if I go with new wheels what the preferred offset should be while maintaining a flush wheel to body look.

 

not sure what you are asking. spacers or the correct wheels will make no difference (its the same thing.. basically).

Also neither of which are a cure for bump steer.

 

I do have an issue at highway speeds - the car starts to wonder. I was led to believe that this is an issue resultant from being lowered and use of spacers on the fronts.

I'm in the process of sourcing new wheels and wanted to ensure that if this, in fact, is the case, I'm not running into the same issue - if it's a bumpsteer problem.

 

lowered (and bump steer) maybe. nothing to do with spacers.

Also could be camber, etc (lots of negative camber from a lowered car will cause it to follow road grooves, etc, more)