wheel and tire package?

[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.

[jgreene0717]

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.

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.

[1970FathomBlueMalibu]

Thanks for the reply, J!

My truck has the factory-equipped 3.23 limited slip rear, so yea, it's pretty high geared and the taller of a tire I go WILL start to drag on performance.

I shouldn't have any issues with the speedo and tire pressure thing, since my brother can take of that in his GM shop. The reflashed speedo will, I believe, cost me about $50, but the tire pressure flash won't. At least I have easy access to remedies on those situations, however.

I'm still up in the air on the size, simply because once I get thru the rough terrain......it's all highway, really. So, some reduced RPM's out there isn't necessarily a bad thing. We only have one stoplight in this area and I might hit it once a week. My point is.....very few stops and starts. I'm just navigating some rocky, muddy terrain and then highway stuff.

My brother IS a little bit concerned that 285's would cause my tires to rub on sharp turns, but he isn't positive about it.

Sigh. I remember these growing pains on my '70 Chevelle when I was younger. I should have known I couldn't leave this truck alone. It's just in my nature to tinker.

Thanks!