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

Richard Dobson · 11-12-2007, 07:43 PM

I have a fleetside 71 C10 with 8" Chevy ralleys. What is the widest tire I can put on the rear. My truck is lowered 3" in the rear. It now has 235/70/R15's on it.

70c10 · 11-12-2007, 07:48 PM

Since your rim is only 8", I probably wouldn't go over a 295/50. That might even make the sidewalls bulge some. I run 275/60/15 on all four corners to fill out the wheel wells but I want wider in the rear also!. I'm looking for a set of 10" rears.

Tx Firefighter · 11-12-2007, 08:16 PM

I agree with 70c10 on this. There are basically two tires worth considering. The 295/50 and 275/60.

The 295 is a bit wider, at the expense of being 26.6 inches tall.

The 275 is a bit narrower, but is a full 28 inches tall, which is basically stock height.

I prefer the taller 275 tire to keep the speedometer accurate and the rear end ratio normal. A much shorter tire like the 295/50 will cause quite noticeable increase in engine RPM due to it's smaller circumference.

I have them on the back of my lowered 72 in my signature.

Richard Dobson · 11-15-2007, 12:30 PM

70C10 & Tx Firefighter thanks for the replies, I rechecked, mytruck's drop is 2-1/2" front and 3-1/2" rear. That's with a 6cly 3 spd which is being swapped out for a 396 w/400 turbo. So I guess the front will drop further. I like the sound of the 275/60/15, since the gear ratio will be more like stock (which is 373:1).
Do you think this setup will look and run well? Thanks again.

11-12-2007, 07:43 PM	#1
Richard Dobson Registered User Join Date: Apr 2003 Location: Easley, South Carolina Posts: 491	Tire Size Question I have a fleetside 71 C10 with 8" Chevy ralleys. What is the widest tire I can put on the rear. My truck is lowered 3" in the rear. It now has 235/70/R15's on it. __________________ Richard Dobson

11-12-2007, 07:48 PM	#2
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	Re: Tire Size Question Since your rim is only 8", I probably wouldn't go over a 295/50. That might even make the sidewalls bulge some. I run 275/60/15 on all four corners to fill out the wheel wells but I want wider in the rear also!. I'm looking for a set of 10" rears. __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

11-12-2007, 08:16 PM	#3
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: Tire Size Question I agree with 70c10 on this. There are basically two tires worth considering. The 295/50 and 275/60. The 295 is a bit wider, at the expense of being 26.6 inches tall. The 275 is a bit narrower, but is a full 28 inches tall, which is basically stock height. I prefer the taller 275 tire to keep the speedometer accurate and the rear end ratio normal. A much shorter tire like the 295/50 will cause quite noticeable increase in engine RPM due to it's smaller circumference. I have them on the back of my lowered 72 in my signature. __________________ I'm on the Instagram- @Gearhead_Kevin

11-15-2007, 12:30 PM	#4
Richard Dobson Registered User Join Date: Apr 2003 Location: Easley, South Carolina Posts: 491	Re: Tire Size Question 70C10 & Tx Firefighter thanks for the replies, I rechecked, mytruck's drop is 2-1/2" front and 3-1/2" rear. That's with a 6cly 3 spd which is being swapped out for a 396 w/400 turbo. So I guess the front will drop further. I like the sound of the 275/60/15, since the gear ratio will be more like stock (which is 373:1). Do you think this setup will look and run well? Thanks again. __________________ Richard Dobson



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