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Old 09-13-2007, 11:33 PM   #1
CCCC
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Tire sizes for dually wheels

I have gradually acquired five 1 ton (ChevC30 and GM3500) trucks (all dually) and the tires sizes are varied to the point where I need some knowledge and advice. I need to buy a set of six, and would like to begin standardizing on the best size for these rigs. Two are chassis mount campers (heavy), one has a heavy welder mounted, one is a wrecker and one a flat bed (the lightest load factor).

One has size LT 7.50x16, another has LT215 85R 16, and another has 215 85R 16, and etc. Is there one size that is better for these trucks - if a person were going to try to get down to one size, what would be the best way to go?

Second question: On a on-ton GMC (1970) with single rear wheels and currently 16.5 in. wheels, what tires are the best for the 16,5 in. wheel, or would you reccomend going to 16 in. wheel?

All info and advice will be appreciated.

PDW
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67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison
Moved but still in the family
70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350
Recently sent to new homes
72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp
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Old 09-14-2007, 05:15 AM   #2
72freak
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Re: Tire sizes for dually wheels

225-75-16 E...I run these...good overall size......Dont buy Cooper Tires in any size
215-85-16 E...work fine
235-85-16 E....big...but work
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Last edited by 72freak; 09-14-2007 at 05:20 AM.
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Old 09-14-2007, 05:35 AM   #3
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Re: Tire sizes for dually wheels

I like the 235/85s.They are closest to the bias 7.50x16s that came on these trucks,which were bias-ply.
I`ve run as small as 215/85s.
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Old 09-14-2007, 06:30 AM   #4
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Re: Tire sizes for dually wheels

I would look at your LT215x85x16 and see how much room is between to rear tires. You don't want to go to a tire size that makes them rub together under load. They will overheat and blow the sidewalls. GM dualleys run LT215x85x16 tires today.
Stick with LT tires as they have heavier sidewalls and will handle loads better in the long run.
There really is no good cheap 16.5 tires without going to 35" mudders. Convert to 16" for good cheap tires.
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Old 09-14-2007, 07:26 AM   #5
67_C-30
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Re: Tire sizes for dually wheels

I'm running 215/85's on both of my C-30's. I am thinking about stepping up to 235/85's on my dually pickup just because they have a bigger look.
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Old 09-14-2007, 11:01 AM   #6
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Re: Tire sizes for dually wheels

Hey CCCC, do you think you could post a pic of your wreaker. I would love to see it. I want to do sort of a "rat rod wreaker" on my current C-20 Dually project and I need some bed ideas. I was just going to fab some stepside fenders onto a fleetside bed to have dually flares but that's kinda beyond my skill level.

67_C-30, is the pic in your avitar real or is it photoshopped? It's to small for me to see good. I looks like a fleetside bed with stepside fenders as dually flares? If it is real do you have a larger pic of it.
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Old 09-14-2007, 01:06 PM   #7
67_C-30
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Re: Tire sizes for dually wheels

Quote:
Originally Posted by Duel72 View Post
Hey CCCC, do you think you could post a pic of your wreaker. I would love to see it. I want to do sort of a "rat rod wreaker" on my current C-20 Dually project and I need some bed ideas. I was just going to fab some stepside fenders onto a fleetside bed to have dually flares but that's kinda beyond my skill level.

67_C-30, is the pic in your avitar real or is it photoshopped? It's to small for me to see good. I looks like a fleetside bed with stepside fenders as dually flares? If it is real do you have a larger pic of it.
The pic in my avatar is a photoshop, but I have got the stepside fenders on the fleetside bed now. It was a 133" WB, and I cut 6" out the frame so I could use a LWB bed. I just got the bed done, and I don't have any pics of it yet with the outside wheel on it. Here is what I have so far.

Also, here is my build thread. http://67-72chevytrucks.com/vboard/s...d.php?t=254096
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‘72 C-10 SWB , 350 4bbl, TH350
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'69 GMC C3500, dump truck, 351 V6, NP435
'84 M1009 CUCV Military Blazer

67 C-30 Turbodiesel build thread
http://67-72chevytrucks.com/vboard/s...d.php?t=254096

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Old 09-14-2007, 01:07 PM   #8
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Re: Tire sizes for dually wheels

Quote:
Originally Posted by Duel72 View Post
I was just going to fab some stepside fenders onto a fleetside bed to have dually flares but that's kinda beyond my skill level.
That's what I thought also, but it was much easier than I thought. I just added pics of how I marked my fenders to fit the fleetside bed.

Here is a lot more of these trucks done this way.
http://67-72chevytrucks.com/vboard/s...d.php?t=126946
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'67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435
‘72 C-10 SWB , 350 4bbl, TH350
'69 C-10 SWB , 250 L6, 3 OTT
'69 GMC C3500, dump truck, 351 V6, NP435
'84 M1009 CUCV Military Blazer

67 C-30 Turbodiesel build thread
http://67-72chevytrucks.com/vboard/s...d.php?t=254096

My trucks
http://s226.photobucket.com/albums/d...ediafilter=all

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Last edited by 67_C-30; 09-14-2007 at 01:24 PM.
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Old 09-14-2007, 02:01 PM   #9
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Re: Tire sizes for dually wheels

Excellent Job 67_C-30! I guess I give it a shot. It actually doesn't look that difficult.
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Old 09-14-2007, 05:10 PM   #10
CCCC
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Re: Tire sizes for dually wheels

Hey - thanks to 72freak, special-K, dwaite72lnghrn, 67C30 and duel72. I needed this insight - now need to get figuring, buying and swapping some wheels/tires around according to loads. As requested, I will post a pic of the 70 wrecker as soon as I figure out hpow to do it - first time.

CCCC
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67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison
Moved but still in the family
70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350
Recently sent to new homes
72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp
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Old 09-14-2007, 05:56 PM   #11
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Re: Tire sizes for dually wheels

Here are two pics of the 1970 C30 wrecker. Love this truck, and it DOES come in handy out here. "67 C-30" - has the standard longest C30 wheel base been extended even further on that hauler? Did you do that makeover? If so, I may wish to chat.

CCCC
Attachment 299729

Attachment 299730
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CCCC
67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison
Moved but still in the family
70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350
Recently sent to new homes
72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp

Last edited by CCCC; 05-11-2010 at 12:21 AM.
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Old 09-14-2007, 06:13 PM   #12
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Re: Tire sizes for dually wheels

WOW! Diffinitely not what I thought it was going to look like. That thing is awesome. Could you get a closer pic of the wreaker unit?
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