Tire size?

[Differentdanyou]

What is the biggest size tires I can fit under my truck without a lift? I have a 1984 GMC high Sierra c20


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[waterpirate]

Hi and welcome. We have multiple threads covering this. Short answer is prolly 31x10.50x15
Eric

 

[Shorty81]

Hi and welcome. We have multiple threads covering this. Short answer is prolly 31x10.50x15
Eric

X2

 

[45tt]

32x11.50x15. I had a K10 that needed tires but I couldn’t afford a lift, so that’s the biggest I could go at stock height without rubbing.

edit - I just reread your post. If you have a two wheel drive, the 32’s will probably rub in the front. 31’s will probably be the better option. If it’s a 4x4 then 32’s will fit.

 

[PrairieDrifter]

Hi and welcome. We have multiple threads covering this. Short answer is prolly 31x10.50x15
Eric

Or an equivalent 265/75r15

 

[Differentdanyou]

32x11.50x15. I had a K10 that needed tires but I couldn’t afford a lift, so that’s the biggest I could go at stock height without rubbing.

edit - I just reread your post. If you have a two wheel drive, the 32’s will probably rub in the front. 31’s will probably be the better option. If it’s a 4x4 then 32’s will fit.

So you think that the IFS on your he 2wd has slightly less clearance than the 4x4 would?


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[BKING33]

I have 265/75R16 on my 3/4 ton 2wd Burb.

 

[Differentdanyou]

I have 265/75R16 on my 3/4 ton 2wd Burb.

No lift? And are they big enough for you or do you feel like you need bigger?


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[BKING33]

No lift. Just have 2 extra leafs in rear spring pack for towing.

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[45tt]

So you think that the IFS on your he 2wd has slightly less clearance than the 4x4 would?


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I was just thinking that 2wd’s usually have a rake in the front that you need to compensate for, and a taller wider tire may not fit like it would on 4wd models.

 

[Differentdanyou]

I was just thinking that 2wd’s usually have a rake in the front that you need to compensate for, and a taller wider tire may not fit like it would on 4wd models.

What is a rake?


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[Differentdanyou]

No lift. Just have 2 extra leafs in rear spring pack for towing.

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Good to know, thank you


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[45tt]

What is a rake?


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usually on factory 2wd’s the front end is slightly lower than the rear of the truck, this is called a rake. Some 2wd’s have a more noticeable rake than others.

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[Differentdanyou]

usually on factory 2wd’s the front end is slightly lower than the rear of the truck, this is called a rake. Some 2wd’s have a more noticeable rake than others.

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Ohhh, thank you for clearing that up


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[bucket]

At stock height, I've found you can get away with bigger tires on a 2wd vs a 4x4. The front track is narrower and the suspension geometry keeps the tires off the fenders.

I've run various "33's" on my '78 C20 and nothing has contacted the fenders. I've run 285/75/16's on stock type narrow rims, 12.00x16.5's on 9.75" wide rims, 33x12.5's on 9.75" wide rims and it has all cleared the fenders fine. I'm currently running the 285's up front and 35x12.5's on the rear and I'm considering running 35's up front just to see how well it may or may not work. I'd have to trim the fenders though.