The biggest tires you can get on a Chevy Silverado 1500?

I am working on buying new mud tires and i need to know what the biggest size tires i would be able to get on my stock 2001 Chevy Silverado 1500 Z71.Any information will be greatly appreciated!!!!!  

I believe you can fit a 33/10.5 on it stock.  
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Awesome! thank you very much!  

33 10.5 or 285 75 16 on stock offset rims, you can fit a 34 12.5 on the truck by triming the valance under the front bumper and running a rim with the same offset as a stock 80's 1/2 ton rim, I beleive that is a 2.5" back set but I may be mistaken,  a frend is running 34 12.5 15's on stock 1983 15x10 steel ralley wheels on his '02 with no lift and after triming the plastic he had no rubbing issues.  
if it ain't dirty, you ain't doing it rite, RNC club motto

You sure about the 285/75? They may be a little too wide for the stock backspacing with no rubbing. Could be wrong though.  
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Long Travel 4WD - The best of Both Worlds

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4WOR Web Editor:
You sure about the 285/75? They may be a little too wide for the stock backspacing with no rubbing. Could be wrong though.

I ran them on my 93 before I lifted it  
if it ain't dirty, you ain't doing it rite, RNC club motto

That was a different body style though...  
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Long Travel 4WD - The best of Both Worlds

Questions? Comments? Concerns? PM Me!

4WOR Web Editor:
That was a different body style though...

03 not 93, sorry, I was thinking about the project I'm working on  
if it ain't dirty, you ain't doing it rite, RNC club motto

Ah... 10-4... in that case rock em! Now we know a 285 will fit, anybody try a 305 stock?  
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Long Travel 4WD - The best of Both Worlds

Questions? Comments? Concerns? PM Me!

i have 285's on mine but mine are A/Ts so im not sure with M/Ts  

thank you all for your input!  

i have a 2000 gmc pickup with a 6in lift and i have 315 75 16 and i ran the stock rims for about a month and the upper control arm started to rub i know that a 4.5in backspacing is what corrected it and a 305 would cause problems if you ran it on stock you would have to do some major trimming  

my buddy's running 305 dick cepek m/c's on stock rims, no lift. I was surprised there was no rub. unless the offset put the rim away from the brake calipers, I don't think you can run a 15"rim on a 99' up. Some older (1995?) factory 16" rims won't clear the calipers. (found out the hard way, was using one as spare.)  

ok then i have 91 chevy 1500 wats the biggest tire size i can runn i want some swampers but dont kno wat size or a meaty mud tire??  

33 12.5 with no lift and no mods  
if it ain't dirty, you ain't doing it rite, RNC club motto