79 c20 tire size help

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

Blue79

Junior Member
Joined
Jul 6, 2023
Posts
20
Reaction score
14
Location
alberta
First Name
Caden
Truck Year
1979
Truck Model
c20
Engine Size
350
I am buying a 1979 c20 some time soon and I know It needs tires and I found some almost new 185/75r16 tires for sale would those fit onto a stock 2wd truck it also comes with rims that re 8x6.5x28 I think those would fit but am not sure
 

75gmck25

Full Access Member
Joined
Oct 13, 2016
Posts
2,266
Reaction score
2,210
Location
Northern Virginia
First Name
Bruce
Truck Year
1975
Truck Model
K25 Camper Special TH350 NP203
Engine Size
5.7
245/75R16, load range E are very close to the original diameter and load rating for a 8400 lb and up GVW truck. It’s also common to use 235/85R16E, which are slightly taller.

185/75R16 would be very small for a 3/4 ton SRW truck.
 

oldretiredafguy

Full Access Member
Joined
Apr 20, 2020
Posts
1,419
Reaction score
3,235
Location
N. Texas
First Name
Mike
Truck Year
1988, 1988, 1991, 1983
Truck Model
GMC V-Jimmy, GMC Suburban 4WD, GMC Suburban 4WD, GMC-2500 CrewCab
Engine Size
350, 350, 350, 350
My earliest data book is a 1983 edition.

The plain Jane C20 came standard with LT215/85R16 tires ( there may have been bias-ply tires on the '73-''79 trucks, but I don't have any literature/builder info going back that far).
The beefed up, HD chassis RPO CP6 came standard with LT235/85R16, as well as the Crew Cab C20.

Here's are nifty little tire size tools everyone can use to see the difference/percentage of using different tires:

<https://tiresize.com/> [Copyright by TireSize.com]
 

bucket

Super Moderator
Staff member
Super Moderator
Joined
Aug 3, 2010
Posts
30,446
Reaction score
28,348
Location
Usually not in Ohio
First Name
Andy
Truck Year
'77, '78, '79, '84, '88
Truck Model
K5 thru K30
Engine Size
350-454
Yeah, 285/75-16 fits fine on a C20 on stock wheels and also later model stock wheels that are similar dimensions.

You must be registered for see images attach
 

Blue79

Junior Member
Joined
Jul 6, 2023
Posts
20
Reaction score
14
Location
alberta
First Name
Caden
Truck Year
1979
Truck Model
c20
Engine Size
350
Hi thank you all for the information it was helpful the deal did not go through unfortunately
 

Forum statistics

Threads
44,168
Posts
950,805
Members
36,286
Latest member
goodwrenchca
Top