Quote:
Originally Posted by Hossel19
Something seems weird.
I ordered 265/35/18 AD08R to put on my TR C4 wheels and Keith's answer above prompted me to look at the specs in more details.
To my surprise, ad08r 265/35/18 tread width stands at 10.3" which is wider then 275/35 tread width on the RS4 and Re-71r based on tirerack information.
Can that be or is it an error on the website?
If this is true does that mean that 265/35/18 AD08R may rub where other tires with the same size won't?
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Thank you for bringing this up. Now we are getting technical.
The tread width can vary depending on how round the tire section.
Flat section with the square shoulders will measure wider than a rounded section with rounder shoulders.
The RE-71R is a rounder section profile than the Yokohama which is very square.
Tread width is not the concern when it comes to clearance issues on most cars.
Section width is what we need to keep an eye on.
The 265/35/18 Yoko AD08R will clear without a problem with a 10.6" section width. The RE-71R is actually .1" wider at section width.
Now, looking at all the specs, the Hankook R-S4 does run very wide at the section width. With the R-S4, depending on where that 11” section is measured become critical.
If the 11” occurs at the rim edge protector, it most likely will require a 3-5mm spacer for proper clearance.
If the 11” occurs way up at or near the shoulder, it might clear the strut and have the right clearance because the strut is angled away from the tire…. As in gaining clearance as you go up. It is possible the 11" section width will clear on the 265/35/18 R-S4, but it is going to be very close
When stepping up to a 275/35/18, you are gaining section width and overall diameter, which is why I recommend a 3-5mm spacer with any of the 275/35/18 tires.
Thanks again!