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Ployester vs radial tires?
#1405340 Fri Apr 09 2021 01:50 PM
Joined: Feb 2020
Posts: 44
F
fred c Offline OP
46 Chevy 1/2 Ton 1929 Model A Phaeton
I have a 46 Chevy 1/2 ton that has been professional restored. It has an annoying tendency to wander while I'm driving. I know this can be caused by many problems but I have had 2 people tell me that replacing the current 6.70-15 4 ply polyester tires with modern radial tires would make a huge difference in handling. I was told radial tires with modern roads are much better than the old style tires. Has anyone replaced polyester tires with radials and experienced a big improvement in handling?

Re: Ployester vs radial tires?
fred c #1405342 Fri Apr 09 2021 02:02 PM
Joined: Apr 2005
Posts: 10,338
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
Back in the 70s when I sold tires our training told us that radials did not follow the imperfections in the road whereas poly and other bias ply tires followed everything causing a lot of unnecessary steering input.


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne 4dr 230 I-6 one owner (I’m #2) “Emily”
‘39 Dodge Businessmans Coupe “Clarence”



"I fought the law and the law won" now I are a retired one!
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Re: Ployester vs radial tires?
fred c #1405344 Fri Apr 09 2021 02:19 PM
Joined: Feb 2019
Posts: 2,284
P
AD Addict
My truck wandered so badly it was like “trying to herd cattle down the road” (a phrase I stole from HRL) and my truck came with radials. It wasn’t until I fixed a worn spring mount, rebuilt the springs, replaced the king pins, tie rod ends and adjusted the steering box that I got her tamed down. I’m not saying you’ll have to replace everything that I did, but any one of those items can cause your truck to wander.

Now bias ply tires as you probably know will pull you from side to side when crossing inline cracks, but they shouldn’t cause you to wander.

Jack up the front of your truck and move things around (wheels, tie rods, steering box, etc.), and see if anything has any play. Also wheel alignment plays into it. Read about adjusting your steering box. It’s a fairly easy procedure and can cause the wandering your talking about.

Here is a link on adjusting your steering box.
http://chevy.oldcarmanualproject.com/shop/1942_47/4247csm901.htm

Last edited by Phak1; Fri Apr 09 2021 02:20 PM.

Phil

1952 Chevrolet 3100
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Re: Ployester vs radial tires?
fred c #1405349 Fri Apr 09 2021 03:05 PM
Joined: Feb 2020
Posts: 44
F
fred c Offline OP
46 Chevy 1/2 Ton 1929 Model A Phaeton
thank you both for the input.

Re: Ployester vs radial tires?
fred c #1405354 Fri Apr 09 2021 03:24 PM
Joined: Apr 2007
Posts: 919
L
'Bolter
I converted my '37 half ton, '51 half ton and '50 2 ton COE from bias tires to radials. In all cases I drove the trucks before and after the conversion without other interventions (like adjusting steering or replacing suspension parts) and the improvement in handling was dramatic. I also bought new bias tires for my '42 half ton, which I have owned for over 20 years, and that also improved handling dramatically. Clearly, new thicker tread helps in handling in both types of tires but you won't be disappointed with the radials.
Kent


1937 Chevy 1/2 ton
1942 Chevy 1/2 ton
1947 Diamond T Model 509
1951 Chevy 1/2 ton
1950 Chevy COE Model 5700 ~ "Barney" ~ And more pix
Re: Ployester vs radial tires?
fred c #1405363 Fri Apr 09 2021 04:18 PM
Joined: Feb 2001
Posts: 7,066
W
'Bolter
I have radials on 1954 1/2 ton and put them almost from the beginning back in 1983, I would not have anything else. The bias tires would jump lanes. I had polyglas added on my 1969 Plymouth Sport Fury for the same reason. The polys were the forerunner of radials. I even paid extra when I bought the Plymouth new.


Ron, The Computer Greek
I love therefore I am.

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Re: Ployester vs radial tires?
fred c #1405377 Fri Apr 09 2021 06:01 PM
Joined: Jul 2019
Posts: 540
B
'Bolter
Tires are probably last on the list of what it is. I have seen pros not do alignments or leave stuff loose. 1/2” of toe out will make a truck drive like the worst junk you could imagine..... then a few turns to 1/8” toe in and it will cruise with 1 hand on the wheel and float down the road with almost no steering input. Are radials better? Yes....... but they might not fix your problem even though some one automatically told you thats your problem.

Re: Ployester vs radial tires?
fred c #1405384 Fri Apr 09 2021 06:37 PM
Joined: May 2001
Posts: 1,730
W
'Bolter
After I switched from bias to radials, I could bring a cup of coffee with me to work without the coffee sloshing out.


1948 3/4-Ton 5-Window Flatbed Chevrolet [sandeace.com]

28 Years of Daily Driving. With a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.
Re: Ployester vs radial tires?
fred c #1405385 Fri Apr 09 2021 06:41 PM
Joined: Feb 2020
Posts: 44
F
fred c Offline OP
46 Chevy 1/2 Ton 1929 Model A Phaeton
thanks everyone for the info. I think I'll start with checking out the steering components. Then try to find someone that can align the front end. If that works I'll save money on the tires. If it doesn't work, I'll spend the money for the radial tires.

Re: Ployester vs radial tires?
fred c #1405402 Fri Apr 09 2021 11:11 PM
Joined: Dec 2008
Posts: 1,065
5
'Bolter
Sounds like a good plan Fred.


Brian
1955.2 3100 Truck


The older I get the more dangerous I am!!!!!
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