Are 31 X 10.50 X 15 Tires Unsafe for Front of 2WD ??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Green Machine · 05-04-2006, 11:45 AM

I am trying a set of 31 X 10.50 on my 68 2WD. The wheels are 8.5 wide with 3 5/8 back space. Pretty large offset to outside, they were on a 4wd blazer.

Truck rides rougher and gets "twichy" on the front unless road is real smooth.
They do need balanced, but they are going to be driven by my 15 year old son soon to get his licence.

We like the looks and how the fill up the wheel well, but I don't want him to wreck a newly restored truck or get hurt because we put too big or the wrong tires on there.

Please offer any suggestions here - Thanks.

Lippyp · 05-04-2006, 12:57 PM

I have 31 x 10.5 x 15 BFG Long Trail radials on my 67 2wd with no problems, rides smooth and straight. Maybe you need to play around a little with the tyre pressures as well as have them balanced until you find a pressure that suits. I run muine at about 30psi.

thecatseye66 · 05-04-2006, 01:06 PM

Does the truck have a front sway bar?
I agree with Lippyp that you need to get the tires balanced and try different pressures, but a sway bar is the best, cheapest handling modification you can make.

Lippyp · 05-05-2006, 03:57 AM

I only fitted my sway bar recently, even without one it still rode fine, it was however like cornering in a small sailing boat before the sway bar was fitted. Now much less lean and more confident cornering.

67sub · 05-05-2006, 08:19 AM

A steering damper will probably help alot. Took a whole bunch of the jumpiness out of mine. Good Luck

05-04-2006, 11:45 AM	#1
Green Machine Senior Member Join Date: Jul 2004 Location: Estherville, Iowa Posts: 3,371	Are 31 X 10.50 X 15 Tires Unsafe for Front of 2WD ??? I am trying a set of 31 X 10.50 on my 68 2WD. The wheels are 8.5 wide with 3 5/8 back space. Pretty large offset to outside, they were on a 4wd blazer. Truck rides rougher and gets "twichy" on the front unless road is real smooth. They do need balanced, but they are going to be driven by my 15 year old son soon to get his licence. We like the looks and how the fill up the wheel well, but I don't want him to wreck a newly restored truck or get hurt because we put too big or the wrong tires on there. Please offer any suggestions here - Thanks. __________________ 1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0 Last edited by Green Machine; 05-04-2006 at 12:02 PM.

05-04-2006, 12:57 PM	#2
Lippyp English Chevy Owner Join Date: May 2002 Location: Shropshire, UK/ Lot, France Posts: 1,848	Re: Are 31 X 10.50 X 15 Tires Unsafe for Front of 2WD ??? I have 31 x 10.5 x 15 BFG Long Trail radials on my 67 2wd with no problems, rides smooth and straight. Maybe you need to play around a little with the tyre pressures as well as have them balanced until you find a pressure that suits. I run muine at about 30psi. __________________ Phil '67 C10 long fleet. 350/TH350, 4 bbl Carter, K&N, Dual exhaust, loads of stuff coming soon 2001 S10 Blazer Daily Driver, bone stock 4 door 4x4 with manual transmission

05-04-2006, 01:06 PM	#3
thecatseye66 '68 C-20 396 CST CC Join Date: Mar 2005 Location: Spokane, WA Posts: 454	Re: Are 31 X 10.50 X 15 Tires Unsafe for Front of 2WD ??? Does the truck have a front sway bar? I agree with Lippyp that you need to get the tires balanced and try different pressures, but a sway bar is the best, cheapest handling modification you can make. __________________ 68 C-20 396/TH400 CST Custom Camper NOW W/DISC BRAKES 01 Jetta Turbo Daily Driver 84 Yamaha Virago 700 - Alaska to Florida Via Maine & Mexico

05-05-2006, 03:57 AM	#4
Lippyp English Chevy Owner Join Date: May 2002 Location: Shropshire, UK/ Lot, France Posts: 1,848	Re: Are 31 X 10.50 X 15 Tires Unsafe for Front of 2WD ??? I only fitted my sway bar recently, even without one it still rode fine, it was however like cornering in a small sailing boat before the sway bar was fitted. Now much less lean and more confident cornering. __________________ Phil '67 C10 long fleet. 350/TH350, 4 bbl Carter, K&N, Dual exhaust, loads of stuff coming soon 2001 S10 Blazer Daily Driver, bone stock 4 door 4x4 with manual transmission

05-05-2006, 08:19 AM	#5
67sub Registered User Join Date: Aug 2003 Location: D/FW TX Posts: 430	Re: Are 31 X 10.50 X 15 Tires Unsafe for Front of 2WD ??? A steering damper will probably help alot. Took a whole bunch of the jumpiness out of mine. Good Luck __________________ 2004 Kawasaki KLR Always looking for a cheap driver

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