Correct Tire Size for 18 x 8.5
12-01-2005, 01:20 AM
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Correct Tire Size for 18 x 8.5
Ok, according to the Fitment Guide the correct tire is 245/40/18. The A-Spec package includes 235/40/18 tires. Which is correct? The main factors to me are:
1. Proper speedometer reading (No recalibration needed)
2. Ride Quality
3. Rim protection (Tire hits before rim on a curb)
1. Proper speedometer reading (No recalibration needed)
2. Ride Quality
3. Rim protection (Tire hits before rim on a curb)
12-01-2005, 09:38 AM
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Originally Posted by hurricane350
Ok, according to the Fitment Guide the correct tire is 245/40/18. The A-Spec package includes 235/40/18 tires. Which is correct? The main factors to me are:
1. Proper speedometer reading (No recalibration needed)
2. Ride Quality
3. Rim protection (Tire hits before rim on a curb)
1. Proper speedometer reading (No recalibration needed)
2. Ride Quality
3. Rim protection (Tire hits before rim on a curb)
rw
12-01-2005, 09:47 AM
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Well unless you are talking about the 04 A-Spec wheels, the 05 & 06 are 18x8. The "right" size is 235/40/18. It was the recommended size even for the 18x8.5.
People normally get the 245/40/18 for a little bit more rim protection. The difference is negligible. I think someone said that at 60mph the variance is only .6 mph.
If you want the protection and to fill up the wheelwell slightly get the 245s. Otherwise get the 235s (as I did). This decision doesn't have much of a consequence in terms of calibration.
People normally get the 245/40/18 for a little bit more rim protection. The difference is negligible. I think someone said that at 60mph the variance is only .6 mph.
If you want the protection and to fill up the wheelwell slightly get the 245s. Otherwise get the 235s (as I did). This decision doesn't have much of a consequence in terms of calibration.
12-01-2005, 09:59 AM
#4
Compare the two using this comparator guide. Just fill in the tire and wheel size to see the differences. It will also figure out the speedo error.
12-01-2005, 01:58 PM
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That link isn't working for me. I just don't get that the Fitment Guide that is stickied would have the incorrect tire size. Even if it is a very minute % off, why would that be stickied if its the wrong size? Oh well, live & learn
12-01-2005, 02:31 PM
#6
Originally Posted by hurricane350
That link isn't working for me. I just don't get that the Fitment Guide that is stickied would have the incorrect tire size. Even if it is a very minute % off, why would that be stickied if its the wrong size? Oh well, live & learn
12-01-2005, 02:55 PM
#7
OK, let's try this again, Rims-n-Tire Comparator. Sorry bout dat, dunno what happened to the link in post #4. I did double check this one and it seems to be working. Mods, clould you delete post #4, that link isn't working, thanks much.
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12-04-2005, 02:03 PM
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I have the '04 18x8.5 A-Spec wheels and replaced mine with 265-35-18's. Couldn't be happier. Looks great, and have alot of rim protection since those wheels are getting harder and harder to find.
The speedometer is not off by much. The comparator in this thread said 3% slower at 60 MPH. Works for me.
The speedometer is not off by much. The comparator in this thread said 3% slower at 60 MPH. Works for me.
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