Quadcammer

Good Evening Gentlemen:

Do you think the following tire sizes would be acceptable for the AWD setup?

245/40/18 25.8" overall diameter, 805 revs per mile
295/30/18 24.9" overall diameter, 834 revs per mile

This is about a 4% difference in diameter.


Thanks in advance

the_buch

From what I recall, that's about as big a spread as the coupler will tolerate over the long run. You will definitely be moving some power up front. I run 235/40s on the front which is a much closer match but still a few more revs per mile on the rears with PS2s. Let us know how it works out if you go that way.

jungleboy

There's many a discussion on this... but I've seen a max recommendation of ~5% differential between front and rear tire sizes. Having said that, I'd still try to keep the differential as minimal as possible, ultimately we ARE talking about wear when things don't match up. I am assuming you've checked the tirerack tables for sizing and revs. Try looking at different brands, they all seem to be slightly different in sizing and therefore might be able to match up a better set with a different brand. I did some research on all this in the past, I am including the comparison... see if it helps. Let us know what you end up with. Good Luck! The table in order of column - tire size, treadwear rating, tread depth, recommended wheel sizing, diameter, rev per mile and best price I've found.

Tire Comparison


Pirelli PZero Rosso

225/40ZR18 Treadwear: 220 10/32" 8-10" 25.1" 829 $216
285/30ZR18 Treadwear: 220 10/32" 9.5-11" 25.2" 836 $356


Michelin Pilot Sport Cups

225/40ZR18 Treadwear: 80 6/32" 7.5-9" 25.1" 834 $306
235/40ZR18 Treadwear: 80 6/32" 8-9.5" 25.4" 819 $289
285/30ZR18 Treadwear: 80 6/32" 10-11" 25.1" 834 $338
295/30ZR18 Treadwear: 80 6/32" 10-11" 25.2" 833 $373


Toyo Proxes R888

235/40ZR18 Treadwear: 100 6/32" 8.0-9.5 25.5 $284
245/40ZR18 Treadwear: 100 6/32" 8.0-9.5 25.7 808 $298
255/35ZR18 Treadwear: 100 6/32" 8.5-10.0 25.1 828 $259
275/35ZR18 Treadwear: 100 6/32" 9.0-11.0 25.7 809 $358
285/30ZR18 Treadwear: 100 6/32" 9.5-10.5 24.8 $361
295/30ZR18 Treadwear: 100 6/32" 10.011.0 25.1 828 $364
305/35ZR18 Treadwear: 100 6/32" 10.012.0 26.3
315/30ZR18 Treadwear: 100 6/32" 10.011.5 25.5

Hankook Ventus R-S3

245/40ZR18 Treadwear: 140 9/32" 8.0-9.5 25.7 808 $199 26lbs
285/35ZR18 Treadwear: 140 9/32" 9.5-11 25.9 803 $277 28lbs


Yokohama Advan Neova AD07

225/40R18 Treadwear: 180 10/32" 7.5-9" 25" 829 $237
235/40R18 Treadwear: 180 10/32" 8-9.5" 25.3" 820 $259
285/30R18 Treadwear: 180 10/32" 9.5-10.5" 24.8" 836 $358
295/30R18 Treadwear: 180 10/32" 10-11" 25.1" 828 $388



KumhoEcsta MX

235/40ZR18 Treadwear: 220 9/32" 8-9.5" 25.5" $149
245/40ZR18 Treadwear: 220 9/32" 8-9.5" 25.8" $167
275/35ZR18 Treadwear: 220 9/32" 9-10.5" 25.7" $208
295/35ZR18 Treadwear: 220 9/32" 10-11.5" 26.1" $242


Sumitomo HTR Z III

235/40ZR18 Treadwear: 300 10/32" 8-9.5" 25.3" 821 $114
245/40ZR18 Treadwear: 300 10/32" 8-9.5" 25.8" 805 $116
255/35ZR18 Treadwear: 300 10/32" 8.5-10" 25" 832 $159
275/35ZR18 Treadwear: 300 10/32" 9-11" 25.5" 816 $179
285/30ZR18 Treadwear: 300 10/32" 9.5-10.5" 24.7" 840 $189
285/35ZR18 Treadwear: 300 10/32" 9.5-11" 26" 803 $189
295/30ZR18 Treadwear: 300 10/32" 10-11" 24.9" 834 $185


Toyo Proxes RA1

245/40ZR18 Treadwear: 100 8/32" 8.0-9.5 25.6 812 $270
275/35ZR18 Treadwear: 100 8/32" 9.0-11.0 25.6 812 $325
305/35ZR18 Treadwear: 100 8/32" 9.0-11.0 26.3



Nitto NT01

235/40ZR18 Treadwear: 100 6/32" 8-9.5" 25.39" 818 $210
245/40ZR18 Treadwear: 100 6/32" 8-9.5" 25.55" 813 $235
275/35ZR18 Treadwear: 100 6/32" 9-11" 25.55" 813 $265


Falken Azenis RT-615

225/40R18 Treadwear: 200 8/32" 7.5-9" 25.1" 818
235/40R18 Treadwear: 200 8/32" 8-9.5" 25.5" 806 $135
245/40R18 Treadwear: 200 8/32" 8-9.5" 25.6" 803 $148
275/35R18 Treadwear: 200 8/32" 9-11" 25.6" 803 $205
315/30R18 Treadwear: 200 8/32" 10.511.5" 25.5" 813


Dunlop Direzza Sport Z1 Star Spec

235/40ZR18 Treadwear: 200 10/32" 8-9.5" 25.1" 817 $174
245/40ZR18 Treadwear: 200 10/32" 8-9.5" 25.7" 808 $182
265/35ZR18 Treadwear: 200 10/32" 9-10.5" 25.3" 820 $231
275/35ZR18 Treadwear: 200 10/32" 9-11" 25.6" 811 $243

Quadcammer

Good info thanks.

I already have a set of 295/30s in the rear (sumi htrz3), so I was looking only at the sumi sizing.

jungleboy

Ah I see... Well, maybe you can go with the 255/35s

Has anyone tried a tire "that" wide before? Stock height? Lowered?

Quadcammer

People have definitely run that large a tire, but I believe there is a chance of rubbing.