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#1 |
Registered User
Join Date: Aug 2013
Location: Homedale, Idaho
Posts: 160
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C 20 Tire Size
Hola,
I've got a 1969 C 20 Longhorn. The tires on it now are 245/75/16. I'm curious if anyone else runs a bigger size. I've got a 4:10 rear axle and would like to get a little better mileage if I can, but I want to make sure the fronts don't rub on turns. Thanks if anybody can add to this.
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Grandpa ![]() 1989 GMC K2500 1958 Alaskan Camper all original WORK : A necessary evil that finances what I really like to do. |
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#2 |
The Niner
![]() Join Date: Nov 2010
Location: Broad Brook, CT
Posts: 2,494
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Re: C 20 Tire Size
265/75/16 will definitely work.
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"A good racer is one whose head is in communication with his balls." - Richie Evans 1970 C/20 - 402/TH400/3.54s - 74K miles 2003 GMC Sierra 2500 - Wheatland Yellow Niner Progression Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=697183 Classic Trucks article: https://www.motortrend.com/features/...et-c20-driven/ |
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#3 |
Senior Member
![]() Join Date: Oct 2009
Location: Godley, TX
Posts: 17,963
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Re: C 20 Tire Size
Yep, what sicklajoie said. 265/75/16 Same thing I've run on my 72 - no interference, not even close. (the last pic is a member's and I'm almost certain that these are even taller - will try to see what size later on some pics I have on another computer - but I "think" they are 235/85/16s). Still wish I'd bought this old saddle custom camper...
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#4 |
The Niner
![]() Join Date: Nov 2010
Location: Broad Brook, CT
Posts: 2,494
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Re: C 20 Tire Size
I believe 235/85/16 and 265/75/16 are the same height, just that the 235s are a narrower treadwidth.
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"A good racer is one whose head is in communication with his balls." - Richie Evans 1970 C/20 - 402/TH400/3.54s - 74K miles 2003 GMC Sierra 2500 - Wheatland Yellow Niner Progression Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=697183 Classic Trucks article: https://www.motortrend.com/features/...et-c20-driven/ |
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#5 |
Senior Member
![]() Join Date: Oct 2009
Location: Godley, TX
Posts: 17,963
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Re: C 20 Tire Size
Excellent point, and, you Sir, are correct! I just cross-checked on the BFG site, they are within 0.2" of each other for diameter. So, just depends which aspect ratio you prefer, tall and skinny or a little wider and same diameter.
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#6 |
The Niner
![]() Join Date: Nov 2010
Location: Broad Brook, CT
Posts: 2,494
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Re: C 20 Tire Size
I went from 235s to 265s on mine. I like the slightly meatier look.
__________________
"A good racer is one whose head is in communication with his balls." - Richie Evans 1970 C/20 - 402/TH400/3.54s - 74K miles 2003 GMC Sierra 2500 - Wheatland Yellow Niner Progression Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=697183 Classic Trucks article: https://www.motortrend.com/features/...et-c20-driven/ |
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#7 |
Registered User
Join Date: Aug 2013
Location: Homedale, Idaho
Posts: 160
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Re: C 20 Tire Size
Thanks for the input! I run 235/85/16 on my Suburban, and like them just fine. My plan is to go as tall as I can to try to gear it up a bit, without interference with the steering or suspension.
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Grandpa ![]() 1989 GMC K2500 1958 Alaskan Camper all original WORK : A necessary evil that finances what I really like to do. |
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#8 |
The Niner
![]() Join Date: Nov 2010
Location: Broad Brook, CT
Posts: 2,494
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Re: C 20 Tire Size
What you really need to do is post some pics of your truck!
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"A good racer is one whose head is in communication with his balls." - Richie Evans 1970 C/20 - 402/TH400/3.54s - 74K miles 2003 GMC Sierra 2500 - Wheatland Yellow Niner Progression Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=697183 Classic Trucks article: https://www.motortrend.com/features/...et-c20-driven/ |
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#9 |
Registered User
Join Date: Aug 2013
Location: Homedale, Idaho
Posts: 160
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Re: C 20 Tire Size
If I figured out how to do this, I'll send more.
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Grandpa ![]() 1989 GMC K2500 1958 Alaskan Camper all original WORK : A necessary evil that finances what I really like to do. |
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#10 |
Registered User
Join Date: Aug 2013
Location: Homedale, Idaho
Posts: 160
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Re: C 20 Tire Size
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Grandpa ![]() 1989 GMC K2500 1958 Alaskan Camper all original WORK : A necessary evil that finances what I really like to do. |
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#11 |
The Niner
![]() Join Date: Nov 2010
Location: Broad Brook, CT
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Re: C 20 Tire Size
Nice!!!
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"A good racer is one whose head is in communication with his balls." - Richie Evans 1970 C/20 - 402/TH400/3.54s - 74K miles 2003 GMC Sierra 2500 - Wheatland Yellow Niner Progression Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=697183 Classic Trucks article: https://www.motortrend.com/features/...et-c20-driven/ |
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#12 |
Registered User
Join Date: Aug 2013
Location: Homedale, Idaho
Posts: 160
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Re: C 20 Tire Size
Everything is the way it was sold new.
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Grandpa ![]() 1989 GMC K2500 1958 Alaskan Camper all original WORK : A necessary evil that finances what I really like to do. |
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#13 |
Registered User
Join Date: Aug 2013
Location: Homedale, Idaho
Posts: 160
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Re: C 20 Tire Size
In the jockey box was the 1969 Warranty Pamphlet filled out by the original owner from a dealership 30 miles away that is still in business.
350 c.i., Sm460 4 speed, Eaton HO 52 rear with 4:10 axles.
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Grandpa ![]() 1989 GMC K2500 1958 Alaskan Camper all original WORK : A necessary evil that finances what I really like to do. |
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#14 |
Roto Reuter thats the name...
![]() Join Date: Feb 2010
Location: Darien, NY
Posts: 1,853
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Re: C 20 Tire Size
On my '69 C20 I'm running 285/70-17 tires with H2 Hummer wheels on all 4-corners..
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~ Dan ![]() My 70 K10 SWB build:http://67-72chevytrucks.com/vboard/s...d.php?t=782232 My 71 SWB build:http://67-72chevytrucks.com/vboard/s...d.php?t=651394 1970 SWB Fleet K10 4X4, 5.3L LM7, 4L60E, Dakota Digital RTX, Vintage Air, Ididit tilt 1971 SWB Fleet C10 - Original SWB Arizona truck, new custom restoration project "Kick out your motor and drive while you're still alive - kick it out!" - Heart 1977 |
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#15 |
Registered User
![]() Join Date: Dec 2013
Location: Norwood, Colorado
Posts: 83
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Re: C 20 Tire Size
The hummer wheels look nice.
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#16 | |
Registered User
Join Date: Sep 2013
Location: Farmersville, TX
Posts: 238
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Re: C 20 Tire Size
Quote:
Agreed. Those look awesome. Is that 2wd? What did you do to get yours level? That is the stance I am looking for.
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Grunt: 1971 C20 Custom Camper. Runs/Drives/Kinda stops. 350Ci, TH350. 4.10:1 D60. Eight Lug LWB is more better. Hell no its not fast! Donkey: 93 Nissan D21, the farm truck. My 1/2 ton SWB. The Indomitable Datsun. 1st BN 3rd MAR. '00-'04 ![]() |
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#17 |
The Niner
![]() Join Date: Nov 2010
Location: Broad Brook, CT
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Re: C 20 Tire Size
I think he put 73-87 springs in the front to level it out.
__________________
"A good racer is one whose head is in communication with his balls." - Richie Evans 1970 C/20 - 402/TH400/3.54s - 74K miles 2003 GMC Sierra 2500 - Wheatland Yellow Niner Progression Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=697183 Classic Trucks article: https://www.motortrend.com/features/...et-c20-driven/ |
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#18 |
Registered User
Join Date: Sep 2013
Location: Farmersville, TX
Posts: 238
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Re: C 20 Tire Size
I thought that might be the case. I really need to do that to my 71.
__________________
Grunt: 1971 C20 Custom Camper. Runs/Drives/Kinda stops. 350Ci, TH350. 4.10:1 D60. Eight Lug LWB is more better. Hell no its not fast! Donkey: 93 Nissan D21, the farm truck. My 1/2 ton SWB. The Indomitable Datsun. 1st BN 3rd MAR. '00-'04 ![]() |
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#19 | |
Roto Reuter thats the name...
![]() Join Date: Feb 2010
Location: Darien, NY
Posts: 1,853
|
Re: C 20 Tire Size
Quote:
The stock HD C20 springs are as follows: http://www.napaonline.com/Catalog/Ca...752_0162319756 Part No.: 2771752 No. of Coils: 7.92 Free Height: 12.94" Spring ID: 3.68" Spring Load Height: 10" Design Load: 2950 Spring Rate: 1016 Wire Diameter: 0.812" The springs I put on from C10, C20, C30 from 1973-83. They are as follows: http://www.napaonline.com/Catalog/Ca...074_0162301536 Part No.: 2772074 No. of Coils: 8 Free Height: 13.61" Spring ID: 3.676" Spring Load Height: 10" Design Load: 3841 Spring Rate: 1060 Wire Diameter: 0.83" You could also use C30 mid '80's 1-ton springs, but I thought they would be too stiff. Those are: http://www.napaonline.com/Catalog/Ca...085_0162304063 Part No.: 2773085 No. of Coils: 7.93 Free Height: 13.34" Spring ID: 3.65" Spring Load Height: 11" Design Load: 3289 Spring Rate: 1318 Wire Diameter: 0.906"
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~ Dan ![]() My 70 K10 SWB build:http://67-72chevytrucks.com/vboard/s...d.php?t=782232 My 71 SWB build:http://67-72chevytrucks.com/vboard/s...d.php?t=651394 1970 SWB Fleet K10 4X4, 5.3L LM7, 4L60E, Dakota Digital RTX, Vintage Air, Ididit tilt 1971 SWB Fleet C10 - Original SWB Arizona truck, new custom restoration project "Kick out your motor and drive while you're still alive - kick it out!" - Heart 1977 |
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#20 |
Registered User
Join Date: Sep 2013
Location: Farmersville, TX
Posts: 238
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Re: C 20 Tire Size
I was thinking along the same lines, but I wouldn't mind a little stiff. The stock spring replacements I list at work are...
Free: 12.94 Installed: 10 Load: 2950 Rate: 1016 Moog part # 6104 The springs I thought of are off of a 1988 R30, there are three versions, standard, with R42 suspension, and R42 HD suspension. I was going to use the R42 HD option. Free: 13.59 Installed: 11 Load: 3788 Rate: 1464 Moog part # 6560S The R42 springs are, Free: 13.19 Installed: 11 Load: 3289 Rate: 1501 Moog part # 6560 I am looking forward to both seeing how my truck looks leveled out, and driving it. My stock springs are REALLY worn out. The PO already put wedge spacers in them, and they still sag. /hijack
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Grunt: 1971 C20 Custom Camper. Runs/Drives/Kinda stops. 350Ci, TH350. 4.10:1 D60. Eight Lug LWB is more better. Hell no its not fast! Donkey: 93 Nissan D21, the farm truck. My 1/2 ton SWB. The Indomitable Datsun. 1st BN 3rd MAR. '00-'04 ![]() Last edited by BlacklandCamper; 03-16-2014 at 11:55 PM. |
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#21 |
Roto Reuter thats the name...
![]() Join Date: Feb 2010
Location: Darien, NY
Posts: 1,853
|
Re: C 20 Tire Size
Keep us posted. I can't wait to hear how it works out for you. Like to see pictures for sure!
__________________
~ Dan ![]() My 70 K10 SWB build:http://67-72chevytrucks.com/vboard/s...d.php?t=782232 My 71 SWB build:http://67-72chevytrucks.com/vboard/s...d.php?t=651394 1970 SWB Fleet K10 4X4, 5.3L LM7, 4L60E, Dakota Digital RTX, Vintage Air, Ididit tilt 1971 SWB Fleet C10 - Original SWB Arizona truck, new custom restoration project "Kick out your motor and drive while you're still alive - kick it out!" - Heart 1977 |
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#22 |
Registered User
Join Date: Nov 2000
Location: Huntsville Ontario Canada
Posts: 4,052
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Re: C 20 Tire Size
I had 285 75 16 on 16x8 rims and they rubbed the front bottom of the front fender. I have a 3" fabtech lift coil. I swapped them out to 265 75 16. with the bigger tires my ball joints and idler arm hated me. Under 35000 miles and they were toast.
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1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD |
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