Quote:
Originally Posted by 1970FathomBlueMalibu
Does anyone know if 285/70/17's will fit a 2008 Silverado?
It's a 2WD CrewCab and sits at stock ride height on the current factory 245/70/17's.
I have so much extra space in the wheelwells that it's ridiculous. I want to fill them up with a moderately aggressive offroad-type tire that still functions on the highway.
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285/70/17 Specs
Overall Diam. 32.8"
Rim width 7.5" to 9.5" wheel
Section width 11.5"
265/70/17 Specs
Overall Diam. 31.7"
Rim width 7" to 9" wheel
Section width 10.7"
245/70/17 Specs
Overall Diam 30.6"
Rim width 7"
Section width 9.8"
Your factory wheel width is either 7.5" or 7" so you could get by with any of these tires in my opinion. As you can see each up size is good for around 1" in overall dia. I would probably go with the 265/70/17. The 285 will hurt overall performance as far as acceleration goes due to the extra rotating mass of such a large tire and speedometer would be pretty far off. The speedo difference would not be as drastic with the 265. You could however get the dealer to reflash the computer for that size tire or buy a handheld programmer such as superchips or diablosport. Another thing to consider is the air pressure setting the new tires will need. If they need much more than the original tires you will have to go to dealer and have them reflash computer for new settings or your tire pressure light will stay lit on your dash due to incorrect tire pressure.