Need help with tire sizes - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68c-10streetrod · 06-05-2011, 11:30 AM

I've got a 1968 C10 6 lug 2wd fleetside. Looking to lower the rear of the truck, but since the tires and wheels have been changed, I dunno what level of lowering springs to buy. It looks like the front has been lowered already. I know the stock ride height is 32" in front, and 34" in the back. I need to know what size tires this truck came out with, so I can add or deduct the current tire size. I found a spec sheet on the truck, and found these numbers for tires sizes. Front 7.75x15 and rear 17.5x17. I've looked at several tire size websites, but cannot get a comparison between the size of the originals, vs the size of the current. HELP?!?!?!?!

Pat_Opsahl · 06-05-2011, 06:56 PM

I would also like to know this. I have a completely stock 1967 C10, LWB Fleet, that has 15 inch steel wheels on the front and 16.5 inch on the rear.
I have seen a number of good deals on used 6 lug wheels from 2001 - 2006 suburbans. Will they fit?
Thanks, Patrick in Livermore, CA

68c-10streetrod · 06-05-2011, 08:31 PM

As long as your truck has the six lug wheel pattern. I'm running 8" wide 255 60 r 15's on mine.

68c-10streetrod · 06-05-2011, 09:29 PM

Even some of the Toyota truck six lug patterns will fit as well.

68Stepbed · 06-06-2011, 08:40 AM

The late model wheels will fit, but the backspacing is incorrect and the wheels just don't look right on our classics.

Try giving Coker Tire a call. They specialize in the original bias-ply and nostalgic tires.

06-05-2011, 11:30 AM	#1
68c-10streetrod Registered User Join Date: Jun 2011 Location: Somerset, Ky Posts: 3	Need help with tire sizes I've got a 1968 C10 6 lug 2wd fleetside. Looking to lower the rear of the truck, but since the tires and wheels have been changed, I dunno what level of lowering springs to buy. It looks like the front has been lowered already. I know the stock ride height is 32" in front, and 34" in the back. I need to know what size tires this truck came out with, so I can add or deduct the current tire size. I found a spec sheet on the truck, and found these numbers for tires sizes. Front 7.75x15 and rear 17.5x17. I've looked at several tire size websites, but cannot get a comparison between the size of the originals, vs the size of the current. HELP?!?!?!?!

06-05-2011, 06:56 PM	#2
Pat_Opsahl Registered User Join Date: May 2011 Location: Livermore CA Posts: 5	Re: Need help with tire sizes I would also like to know this. I have a completely stock 1967 C10, LWB Fleet, that has 15 inch steel wheels on the front and 16.5 inch on the rear. I have seen a number of good deals on used 6 lug wheels from 2001 - 2006 suburbans. Will they fit? Thanks, Patrick in Livermore, CA

06-05-2011, 08:31 PM	#3
68c-10streetrod Registered User Join Date: Jun 2011 Location: Somerset, Ky Posts: 3	Re: Need help with tire sizes As long as your truck has the six lug wheel pattern. I'm running 8" wide 255 60 r 15's on mine.

06-05-2011, 09:29 PM	#4
68c-10streetrod Registered User Join Date: Jun 2011 Location: Somerset, Ky Posts: 3	Re: Need help with tire sizes Even some of the Toyota truck six lug patterns will fit as well.

06-06-2011, 08:40 AM	#5
68Stepbed Registered User Join Date: Mar 2005 Location: 10-Uh-See Posts: 5,609	Re: Need help with tire sizes The late model wheels will fit, but the backspacing is incorrect and the wheels just don't look right on our classics. Try giving Coker Tire a call. They specialize in the original bias-ply and nostalgic tires. __________________ Matt 68 C10 stepside, LS1/700R4, TCI Engineering suspension system



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