Largest Tire Size Without Modifications - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sure_green · 07-25-2004, 09:28 AM

Hello Guys:

What is the largest tire size (millimeters or inches) in height and width can I use with and 18" wheel on my 1972 fleetside chevy if I lowered it 2.5 inches in the front and 3 inches in the rear. I like the look of a 285/50 R18 ( 11.2' wide and 29.2" tall) for the rear and a 255/55 R18 (10" wide and 29" tall) for the front.

I sure don't want my tires to scrub

Thanks Guys

nartkers · 08-03-2004, 12:53 PM

this would be very good to know - I want to do the same thing on my '70

67chevemall · 08-03-2004, 03:16 PM

I like the 25.5X 10 " on all 4 corners!
I also like to go 185kph!

ryan68 · 08-03-2004, 04:05 PM

The size you are thinking of will work, the 285/50s and 255/55s. I was gonna run those on mine lowered 3/5. I'm going to 20's now that are right at 30" tall and 11" wide. The tires on it now are 30" tall and 11" wide, no rubbing, no problems.

67chevemall · 08-04-2004, 08:42 AM

Dam 30" tall w/no rubbing?

nartkers · 08-04-2004, 02:36 PM

what's the backspacing and lowering to get 30" tire?

ryan68 · 08-04-2004, 06:04 PM

They are 15x7's with 3.5" backspacing. I actually was pushing it around on 33's on 15x10's with 3.5" backspacing with a 3/5 drop. The tires I wanta run are 275/45 or 295/40 20's on 20x9 or 20x9.5's with 4-4.5" backspacing and I don't see a problem. Nothing looks cooler than FILLED wheel wells on a lowered truck. As for the drop, I've got about 1.5" till I hit bumpstops on the front and 2" on the back.

07-25-2004, 09:28 AM	#1
sure_green Registered User Join Date: Feb 2003 Location: mississippi Posts: 42	Largest Tire Size Without Modifications Hello Guys: What is the largest tire size (millimeters or inches) in height and width can I use with and 18" wheel on my 1972 fleetside chevy if I lowered it 2.5 inches in the front and 3 inches in the rear. I like the look of a 285/50 R18 ( 11.2' wide and 29.2" tall) for the rear and a 255/55 R18 (10" wide and 29" tall) for the front. I sure don't want my tires to scrub Thanks Guys

08-03-2004, 03:16 PM	#3
67chevemall Registered User Join Date: Apr 2003 Location: NB Posts: 3,367	I like the 25.5X 10 " on all 4 corners! I also like to go 185kph! __________________ 1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD

08-03-2004, 04:05 PM	#4
ryan68 Certified Chevy Man Join Date: Jan 2000 Location: Tucson, Arizona, United States Posts: 2,053	The size you are thinking of will work, the 285/50s and 255/55s. I was gonna run those on mine lowered 3/5. I'm going to 20's now that are right at 30" tall and 11" wide. The tires on it now are 30" tall and 11" wide, no rubbing, no problems. __________________ 68 Chevy CST (327,TH400) 3/5 drop lots of fun stuff 71 Suburban 4x4 (350,TH350) 7" lift 37's, D44/14 bolt and other sorts of goodies, lockers front and rear, flexes 40", 895 RTI score Check out my web site!!! http://www.geocities.com/cst68chevy/

08-04-2004, 06:04 PM	#7
ryan68 Certified Chevy Man Join Date: Jan 2000 Location: Tucson, Arizona, United States Posts: 2,053	They are 15x7's with 3.5" backspacing. I actually was pushing it around on 33's on 15x10's with 3.5" backspacing with a 3/5 drop. The tires I wanta run are 275/45 or 295/40 20's on 20x9 or 20x9.5's with 4-4.5" backspacing and I don't see a problem. Nothing looks cooler than FILLED wheel wells on a lowered truck. As for the drop, I've got about 1.5" till I hit bumpstops on the front and 2" on the back. __________________ 68 Chevy CST (327,TH400) 3/5 drop lots of fun stuff 71 Suburban 4x4 (350,TH350) 7" lift 37's, D44/14 bolt and other sorts of goodies, lockers front and rear, flexes 40", 895 RTI score Check out my web site!!! http://www.geocities.com/cst68chevy/

08-03-2004, 12:53 PM	#2
nartkers Registered User Join Date: Jan 2004 Location: Mid-Michigan Posts: 178	this would be very good to know - I want to do the same thing on my '70

08-04-2004, 08:42 AM	#5
67chevemall Registered User Join Date: Apr 2003 Location: NB Posts: 3,367	Dam 30" tall w/no rubbing?

08-04-2004, 02:36 PM	#6
nartkers Registered User Join Date: Jan 2004 Location: Mid-Michigan Posts: 178	what's the backspacing and lowering to get 30" tire?



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