Acceptable Non-OE Tire Sizes for AWD?
#1
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Join Date: Jun 2013
Location: Omaha, Nebraska
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Acceptable Non-OE Tire Sizes for AWD?
I'm thinking of buying wider 9" front wheels and stepping up the tire width, but I know the AWD requires similar circumference on front & rear.
But what I don't know... What is the acceptable difference in circumference to avoid differential damage?
The stock 225/40-18 and 295/30-18 are within 0.5%.
245/35-18 and 295/30-18 are within 0.9%. Is this okay? Anyone run this set-up with AWD?
Thanks for the help.
But what I don't know... What is the acceptable difference in circumference to avoid differential damage?
The stock 225/40-18 and 295/30-18 are within 0.5%.
245/35-18 and 295/30-18 are within 0.9%. Is this okay? Anyone run this set-up with AWD?
Thanks for the help.
#3
I'm thinking of buying wider 9" front wheels and stepping up the tire width, but I know the AWD requires similar circumference on front & rear.
But what I don't know... What is the acceptable difference in circumference to avoid differential damage?
The stock 225/40-18 and 295/30-18 are within 0.5%.
245/35-18 and 295/30-18 are within 0.9%. Is this okay? Anyone run this set-up with AWD?
Thanks for the help.
But what I don't know... What is the acceptable difference in circumference to avoid differential damage?
The stock 225/40-18 and 295/30-18 are within 0.5%.
245/35-18 and 295/30-18 are within 0.9%. Is this okay? Anyone run this set-up with AWD?
Thanks for the help.
Spec Sidewall Radius Diameter Circum Revs/Mile Difference
225/40-18 3.5in 12.5in 25.1in 78.8in 804 0.0%
235/40-18 3.7in 12.7in 25.4in 79.8in 794 1.3%
295/30-18 3.5in 12.5in 25.0in 78.4in 808 0.0%
315/30-18 3.7in 12.7in 25.4in 79.9in 793 1.9%
the 315 has a diameter of 25.5". The 295-30 is 25.1" the 235- has 25.4", and the 225-40 is 25.1"
this is the only set of specs i still have/use. there was a very comprehensive thread/spreadsheet for all compatible pcar tire size/offsets incl rev per mile differences, but i'm unable to find it. sorry. you might find it with a search
#4
Nordschleife Master
Only problem with going with 235/40/18, 315/30/18 combo is that there are no R compound tires. I stay with stock becuase I can run MS PS cups which provide way more grip then putting on wider tires.
#7
Nitto NT01s come in this size. I've been running this size on 9/12" wheels for several years. Probably the best bang for the buck R compound out there. Good to the cords..
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#8
#9
Nordschleife Master
#10
#11
Nordschleife Master
Thanks, I am going to start doing the same. The tires sound like they can stand more heat cycles and they are wider then the cups.
#12
Burning Brakes
#13
Unlike the Cups, heat cycles are not an issue on the Nittos. They're good to the cords. I'm switching NT01 sizes to 245/40/18 and 305/35/18, obviously not an AWD set up. Just ordered 2 sets. $912 per set out the door...
#14
Nordschleife Master
What offset are you running on the 12" rears? Tried them on the stock 11" and they don't work. Also did you roll the fenders?
#15
I run the NT01s on 18x12 ET41 without any issues. I have also run them on 18x12 ET44 without any problems. Rear fenders are rolled. My friend now has my old ET44 wheels with 315/30/18 PS2s and has zero issues even though his fenders are not rolled.