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08-08-2025, 12:09 AM
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#1 |
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Registered User
Join Date: May 2014
Location: Mission BC
Posts: 473
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68 c10 tire size question.
My 68 is in pieces in my shop for floor repairs, rockers etc. I am hoping to mate it to the frame in the next few weeks. I need to order tires because the ones that it came with have dry rot. I will be using 15 x 8 rally wheels, and it will have a 4-6 drop most likely. What size looks good? Picture if possible. Thanks
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1962 C10 Longbox LS 5.3 4L60E----Sold$$ 1972 K10 Custom Deluxe LS 6.0 1950 GMC 3100 S10 & LS swapped---sold 1955 f100 LS swapped----sold 1968 C10 shorty project 1971 C10 longy project |
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08-08-2025, 12:58 AM
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#2 |
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Registered User
Join Date: Oct 2013
Location: San Diego, Ca
Posts: 30
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Re: 68 c10 tire size question.
I have 275/60R15 rear and 235/70R15 front. Rear wheels are 10 inches, and fronts are 8. I had the 275 tires on the 8 inch wide rims up front, but I had some slight rubbing so I replaced them with narrower 235. It took me a while to find the right combo because I did a front disc conversion several years ago, which pushed the wheel face out a bit.
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08-08-2025, 01:05 AM
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#3 |
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Registered User
Join Date: Oct 2013
Location: San Diego, Ca
Posts: 30
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Re: 68 c10 tire size question.
Here's a pic in better lighting. 2.5" dropped spindles front, 4" drop springs rear.
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08-08-2025, 08:30 AM
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#4 |
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Senior Member
 
Join Date: Dec 1999
Location: TX
Posts: 1,787
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Re: 68 c10 tire size question.
275/60R15 all around or do the 235/70R15 on the front. Tire shop gave me a hard time about mounting the 235/70 on 8 inch wheels because they needed to stretch a little to seat the bead...
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08-09-2025, 11:25 AM
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#5 |
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Registered User
Join Date: Mar 2018
Location: Colchester IL
Posts: 512
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Re: 68 c10 tire size question.
Ivory 68 good looking truck. Guys around here would love to have such a rusty truck.
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08-10-2025, 11:21 AM
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#6 | |
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Registered User
Join Date: Oct 2013
Location: San Diego, Ca
Posts: 30
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Re: 68 c10 tire size question.
Quote:
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08-10-2025, 02:07 PM
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#7 |
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Registered User
Join Date: Feb 2016
Location: Portland Oregon
Posts: 12,412
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Re: 68 c10 tire size question.
Lots of information here. I run 275/60's on the rear and 255/60's on the front
http://67-72chevytrucks.com/vboard/s...d.php?t=703601
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.  RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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08-11-2025, 12:45 PM
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#8 | |
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Registered User
Join Date: Sep 2011
Location: Ark City, Kansas
Posts: 3,551
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Re: 68 c10 tire size question.
Quote:
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08-11-2025, 06:58 PM
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#9 |
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425hp409
Join Date: Oct 2008
Location: Prosper Texas
Posts: 883
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Re: 68 c10 tire size question.
My 68 SWB is running 84 C10 8" wheels with P255/R-70 tires
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Charles 68 SWB, Dad bought new, now 396 & factory ac 64 Impala SS, 409 425HP, 4 speed AC 64 Bel Air Wagon, 400 Small Block 57 Bel Air all original 283 w/Factory Air 77 GMC Sprint, 454/425HP 67 Oldsmobile 442, all original |
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08-12-2025, 08:27 AM
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#10 |
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Registered User
Join Date: Jul 2019
Location: Yellville, AR
Posts: 2,584
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Re: 68 c10 tire size question.
Your drop is a bit lower than mine (2.5/4) and I am running 255/70-15 on 8" rally wheels. Now that I have power steering, will probably go 275/60-15 next time.
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1967 C10 1997 Ford Ranger 2020 Toyota 4Runner 2024 Toyota Tundra |
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08-12-2025, 03:15 PM
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#11 |
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Registered User
Join Date: Jul 2007
Location: Toppenish, WA
Posts: 16,400
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Re: 68 c10 tire size question.
Late to the party but the info you want is in here https://www.gm.com/content/dam/compa...-Chevrolet.pdf
Your scroll wheel finger might get a bit tired but it tells what size tires were standard and optional on 68 trucks. Then unless you are spending the big money for bias tires you will have to put your decoder ring on to go from Bias numbers to radial sizes. For tire size comparison I use this calcuator a lot and plug in two sizes and it shows the differences between the two but only works with radials. This shows the differences between 275-60 15 and 255-50 15 The second one is the 235-70 15 vs 255-60 15 comparision
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Founding member of the too many projects, too little time and money club. My ongoing truck projects: 48 Chev 3100 that will run a 292 Six. 71 GMC 2500 that is getting a Cad 500 transplant. 77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around. Last edited by mr48chev; 08-12-2025 at 03:25 PM. |
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08-18-2025, 09:31 AM
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#12 |
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Registered User
Join Date: Feb 2021
Location: Kernersville, NC
Posts: 150
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Re: 68 c10 tire size question.
Tremec has a cool app, "Tremec Tool Box". Driveline angle finder - Speed calculator - RPM calculator and Tire size calculator. Something else to help with fitment questions
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