Tire Size - The 1947 - Present Chevrolet & GMC Truck Message Board Network

skokie · 01-12-2004, 01:24 AM

I did a search on the site and got a few different answers. What is the correct tire size for a 68 1/2 ton with a v8?

Thanks

whitesswj · 01-12-2004, 01:29 AM

I've got P235/75R15 GoodYear Wrangler A/T's on my 68 c10 1/2 ton w/ a I6

Go with what you like!
I'm fine with mine. They're not too small but not to big!

shuttermutt · 01-12-2004, 01:41 AM

I believe the factory called for an 8.25-15 tire back then. Obviously, these days finding an equivalent tire might be a bit tricky. You could get close, but why on earth would you want to?

Me? I'm moving up in the world from a 205/70/15 to a 255/70/16. In other words, I'm gaining almost 3 inches of diameter. Funny, it doesn't sound like much, but when you get 'em on there, it's a huge difference.

Personally, I'm of the mindset that a truck should have a good sized wheel (16 is my favorite) and enough sidewall to make it look and perform like a truck should.

skokie · 01-12-2004, 01:46 AM

Quote:

I believe the factory called for an 8.25-15 tire back then

What does 8.25-15 = out to in 225 75 15 etc?

Thanks

shuttermutt · 01-12-2004, 01:50 AM

I think it's something like a 205/85/15. It's a pretty weird size no matter how you slice it.

skokie · 01-12-2004, 01:52 AM

Wow that is kinda wierd. That would be (guessing) about 25 26 inches tall and kinda skinny. I think I will got for Either 225/70/15 or 275/60/15.
Thanks again.

shuttermutt · 01-12-2004, 02:03 AM

Yeah, they were real tall and skinny. Oh, and I was wrong earlier. I won't gain 3 inches, I'll actually gain just a hair under 4 inches in total diameter when I swap my wheels and tires out tomorrow or Tuesday. Goodbye speedometer accuracy and hello highway speeds!

skokie · 01-12-2004, 02:12 AM

How tall will the tires be when your done? I have 31s on mine but if you measure them they are actually 28.5.

shuttermutt · 01-12-2004, 02:21 AM

If you do the math, the tires I have are 26.3 inches tall and the new tires will be 30.06 inches tall. Now, if we assume that the tires will actually be shorter than the theoretical "perfect" diameter, then it's still safe to assume that I'll gain roughly 4 inches (+/- .50) when mounted.

swede413 · 01-12-2004, 02:33 AM

This link can be handy
http://www.smokemup.com/auto_math/tire_diameter.php

01-12-2004, 01:24 AM	#1
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,354	Tire Size I did a search on the site and got a few different answers. What is the correct tire size for a 68 1/2 ton with a v8? Thanks

01-12-2004, 01:29 AM	#2
whitesswj Embrace the Redneck Join Date: Jan 2004 Location: Cabot, AR Posts: 1,334	I've got P235/75R15 GoodYear Wrangler A/T's on my 68 c10 1/2 ton w/ a I6 Go with what you like! I'm fine with mine. They're not too small but not to big! __________________ '01 Camaro *Son, you just can't get there from here...*

01-12-2004, 01:41 AM	#3
shuttermutt Don't say "Oops!", Doctor Join Date: Nov 2003 Location: Houston, TX Posts: 677	I believe the factory called for an 8.25-15 tire back then. Obviously, these days finding an equivalent tire might be a bit tricky. You could get close, but why on earth would you want to? Me? I'm moving up in the world from a 205/70/15 to a 255/70/16. In other words, I'm gaining almost 3 inches of diameter. Funny, it doesn't sound like much, but when you get 'em on there, it's a huge difference. Personally, I'm of the mindset that a truck should have a good sized wheel (16 is my favorite) and enough sidewall to make it look and perform like a truck should. __________________ 'Mutt 1968 CST LWB: R.I.P. 1967 Chevelle: TPI 454 beast 1967 C10 SWB: Claimed when Bumpster didn't put it on his list

01-12-2004, 01:50 AM	#5
shuttermutt Don't say "Oops!", Doctor Join Date: Nov 2003 Location: Houston, TX Posts: 677	I think it's something like a 205/85/15. It's a pretty weird size no matter how you slice it. __________________ 'Mutt 1968 CST LWB: R.I.P. 1967 Chevelle: TPI 454 beast 1967 C10 SWB: Claimed when Bumpster didn't put it on his list

01-12-2004, 01:52 AM	#6
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,354	Wow that is kinda wierd. That would be (guessing) about 25 26 inches tall and kinda skinny. I think I will got for Either 225/70/15 or 275/60/15. Thanks again. __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234

01-12-2004, 02:03 AM	#7
shuttermutt Don't say "Oops!", Doctor Join Date: Nov 2003 Location: Houston, TX Posts: 677	Yeah, they were real tall and skinny. Oh, and I was wrong earlier. I won't gain 3 inches, I'll actually gain just a hair under 4 inches in total diameter when I swap my wheels and tires out tomorrow or Tuesday. Goodbye speedometer accuracy and hello highway speeds! __________________ 'Mutt 1968 CST LWB: R.I.P. 1967 Chevelle: TPI 454 beast 1967 C10 SWB: Claimed when Bumpster didn't put it on his list

01-12-2004, 02:12 AM	#8
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,354	How tall will the tires be when your done? I have 31s on mine but if you measure them they are actually 28.5. __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234

01-12-2004, 02:21 AM	#9
shuttermutt Don't say "Oops!", Doctor Join Date: Nov 2003 Location: Houston, TX Posts: 677	If you do the math, the tires I have are 26.3 inches tall and the new tires will be 30.06 inches tall. Now, if we assume that the tires will actually be shorter than the theoretical "perfect" diameter, then it's still safe to assume that I'll gain roughly 4 inches (+/- .50) when mounted. __________________ 'Mutt 1968 CST LWB: R.I.P. 1967 Chevelle: TPI 454 beast 1967 C10 SWB: Claimed when Bumpster didn't put it on his list

01-12-2004, 02:33 AM	#10
swede413 Registered User Join Date: Apr 2001 Location: Las Vegas NV Posts: 183	This link can be handy http://www.smokemup.com/auto_math/tire_diameter.php __________________ 70 blazer 350 3on tree 98 GMC 3/4 ton 4x4 5 speed manual

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