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

gobelig · 03-19-2010, 07:27 AM

Was wondering what the maximum rear tire with you can fit with out tubbing the wheel wells. I have a 69 GMC with leaf springs and a 4" drop in the rear, I bolted on a 10" wide 15" rim with 4" backspace and measured the clearences. I'm thinking I can fit a 315/60/R15 drag slick. Does anyone else have this size on the rear of their truck?

Ackattack · 03-19-2010, 10:42 AM

I had a 295/50/15 on my 72 GMC with leafs and didn't have problems. I don't know the backspacing on the wheels (probably pretty close to 4"). The truck was lowered a little too.

KFreddy · 03-19-2010, 04:02 PM

With a 4" backspace, same as stock, you'll have approximately 6" on the front side of the wheel and 4" on the back side. The wheels might be sticking out a bit with that offset, donno.

It's not so much the frame/ inner wheels well that would be an issue but the outer fender of the wheel well where it might rub, a 315/60-15 is right on 30" in diameter the height should not be a problem at all. However the Section width is right around 13" and the tread is just about 12", that's a nice fat tire.

I would take a wheel off of the truck and simply measure the distance between the inner and outer wheel well and the frame and the outer wheel well/ fender. That way you will know exactly what your working with.

gobelig · 04-10-2010, 07:45 AM

From my measurements I decided to go ahead and get the 315/60/R15 MT Drag Radials, boy am I glad I did! They fit like a glove and look great. Plenty of clearence on the wheel well side and more than enough on the fender side. I will post some picts ASAP.

lowdownstar · 04-10-2010, 08:00 AM

Can't wait to see them!

Ray

ratrod67 · 04-10-2010, 10:48 AM

I have run the 315/60 on 2 of my trucks in the past and they look GOOD!

GCncsuHD · 04-16-2010, 06:09 PM

Quote:

Originally Posted by gobelig

From my measurements I decided to go ahead and get the 315/60/R15 MT Drag Radials, boy am I glad I did! They fit like a glove and look great. Plenty of clearence on the wheel well side and more than enough on the fender side. I will post some picts ASAP.

Did you ever get pictures?

ap2002 · 04-19-2010, 10:26 PM

please post some pics.... im looking into getting the same tire...

gobelig · 08-02-2011, 08:15 PM

Sorry it took so long, here are the picts!

Mack81 · 08-02-2011, 08:53 PM

looks great!

vroom · 08-03-2011, 07:08 AM

looks good, what size are you running on the front?

**special-K** · 08-03-2011, 07:30 AM

10" wheel,right? Looks awesome.

03-19-2010, 07:27 AM	#1
gobelig Registered User Join Date: Mar 2010 Location: Rhode Island Posts: 10	Maximum Rear Tire Size? Was wondering what the maximum rear tire with you can fit with out tubbing the wheel wells. I have a 69 GMC with leaf springs and a 4" drop in the rear, I bolted on a 10" wide 15" rim with 4" backspace and measured the clearences. I'm thinking I can fit a 315/60/R15 drag slick. Does anyone else have this size on the rear of their truck?

03-19-2010, 10:42 AM	#2
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,525	Re: Maximum Rear Tire Size? I had a 295/50/15 on my 72 GMC with leafs and didn't have problems. I don't know the backspacing on the wheels (probably pretty close to 4"). The truck was lowered a little too. __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index

03-19-2010, 04:02 PM	#3
KFreddy Active Member Join Date: Apr 2005 Location: Miami, Florida Posts: 286	Re: Maximum Rear Tire Size? With a 4" backspace, same as stock, you'll have approximately 6" on the front side of the wheel and 4" on the back side. The wheels might be sticking out a bit with that offset, donno. It's not so much the frame/ inner wheels well that would be an issue but the outer fender of the wheel well where it might rub, a 315/60-15 is right on 30" in diameter the height should not be a problem at all. However the Section width is right around 13" and the tread is just about 12", that's a nice fat tire. I would take a wheel off of the truck and simply measure the distance between the inner and outer wheel well and the frame and the outer wheel well/ fender. That way you will know exactly what your working with. __________________ "The Great State of Florida"

04-10-2010, 07:45 AM	#4
gobelig Registered User Join Date: Mar 2010 Location: Rhode Island Posts: 10	Re: Maximum Rear Tire Size? From my measurements I decided to go ahead and get the 315/60/R15 MT Drag Radials, boy am I glad I did! They fit like a glove and look great. Plenty of clearence on the wheel well side and more than enough on the fender side. I will post some picts ASAP.

04-10-2010, 08:00 AM	#5
lowdownstar big guy Join Date: Jun 2008 Location: mass Posts: 824	Re: Maximum Rear Tire Size? Can't wait to see them! Ray

04-10-2010, 10:48 AM	#6
ratrod67 Registered User Join Date: Sep 2002 Location: DFW Texas Posts: 2,270	Re: Maximum Rear Tire Size? I have run the 315/60 on 2 of my trucks in the past and they look GOOD!

04-19-2010, 10:26 PM	#8
ap2002 Registered User Join Date: Apr 2008 Location: Houston, TX Posts: 247	Re: Maximum Rear Tire Size? please post some pics.... im looking into getting the same tire... __________________ 1971 C-10 SWB - LS swap w/4L60e, 20x8.5front 20x12rear, 1968 C-10 SWB - 454 BB TH350 -Gone!

08-02-2011, 08:15 PM	#9
gobelig Registered User Join Date: Mar 2010 Location: Rhode Island Posts: 10	Re: Maximum Rear Tire Size? Sorry it took so long, here are the picts!

08-02-2011, 08:53 PM	#10
Mack81 Registered User Join Date: Aug 2010 Location: Tennessee Posts: 26	Re: Maximum Rear Tire Size? looks great! __________________ '68 C10 SWB "Purple Nurple"

08-03-2011, 07:08 AM	#11
vroom Registered User Join Date: Jul 2011 Location: Christchurch Posts: 16	Re: Maximum Rear Tire Size? looks good, what size are you running on the front?

08-03-2011, 07:30 AM	#12
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Re: Maximum Rear Tire Size? 10" wheel,right? Looks awesome. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~



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