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tires sizes on 05 sierra


fetty
01-03-2008, 10:47 PM
I have an '05 Sierra Z71, it comes with stock 265/70r17 Bridgestone Dueler tires. These are worn out and I'm wondering if i can go to a 285 or 33" tire, some guys say it'll be fine while others figure I'll need about a 2" lift up front (leveling kit) Does anyone know what the right answer would be? Also, I'm not sure what kind of tires i want. I want something that looks aggressive but with really good road manners, and of course good traction all around (snow, ice etc...) And of course price is an issue. I have a few that I'm looking at:
Firestone Destination m/t
Kumho Road Venture m/t
Toyo Open Country m/t
Hankook Dynapro m/t

I'm leaning towards the hankooks but i hear they're not very good on ice because of the lack of siping. Any opinions or other suggestions would be appreciated! Thanks!

Z15
01-04-2008, 08:28 AM
read this....

A truck that has different tires and wheels will have Engine power/performance concerns, Transmission shift concerns, Speedometer registered speed concerns, and Cruise Control concerns.

Before any diagnosis is performed for these types of concerns, inspect the tires/wheels for the proper tire and wheel combinations.

If a truck is found to have other than the above listed tire sizes, no further diagnosis should be undertaken until the original size tires and wheels are reinstalled on the truck.

The Engine Control Unit (ECM) and Transmission Control Module (TCM) use (RPM) and (VSS) inputs as operational parameters for engine torque, transmission shifting, cruise control operation and speedometer indicated vehicle speed.

Calibrations for different tire/wheel combinations are not available.

Therefore changing of tire and/or wheel size should not be undertaken by dealerships or truck owners.

Warranty Information
Reinstalling the proper wheels and tires on the vehicle, prior to performing any type of diagnosis of the truck, would be considered truck owner responsibility and not a warranty repair.

As for the tires you mentioned, I would nut buy any of them. I heard some bad things about the Kumho when it comes to ballancing.

sechracer
01-06-2008, 10:00 PM
As for tire size, you can easily fit a 285 in there as long as you adjust the sidewall size. A 285/65R17 is about .1 inch bigger in cirumference. As for going taller, it will mess up the speedometer, A 285/70R17 would make it so you were going 62mph when your speedo says 60.

As for the post above me, that may be followed by a few dealerships, but not many. Tire size can be adjusted. Hypertec has it as part of the programming in the power programmers. Not to mention, a computer can be programmed to change shift points and adjust/ remove rev limiters amongst other things.

As for your tire selctions, I know that Kuhmo makes an excellent tire, and would personally stay away from the firestones.

mad1517
01-07-2008, 02:19 PM
Check out this calculator for tire size differences.I have 285's on my 92 I know its different body style,but I think they will work.

http://www.miata.net/garage/tirecalc.html

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