[AT] OT truck tires/driveshaft?

charlie hill charliehill at embarqmail.com
Thu May 15 11:04:50 PDT 2014


Mike you are exactly right.  I did misread that and Jeff you have my 
apology.
Mike thanks for pointing that out.

Charlie


-----Original Message----- 
From: Mike
Sent: Thursday, May 15, 2014 1:12 PM
To: Antique tractor email discussion group
Subject: Re: [AT] OT truck tires/driveshaft?

Charlie, i think you may have misread Jeff's post, he is saying NOT to
inflate tires to their maximum pressure by default. I also think that
the pressure ratings provided by the auto manufacturers, are mainly for
passenger vehicles, not trucks (pick-ups included) that are hauling
heavy loads or trailers. With my truck I put maximum pressure in the
rears when hauling our goose-neck, and it rides and handles fine. When
we're done hauling I take the air right back out again. If I don't I
bounce around like crazy and have poor rear traction.

Mike M

On 5/15/2014 6:49 AM, charlie hill wrote:
> Jeff I know you mean well by posting that and since I don't
> remember seeing you post here before I don't want to discourage
> you with a negative reply but I just can't agree with that.
>
> Generally speaking your tires should be inflated to the pressure that
> creates maximum
> contact with the pavement.   Put a set of load range  E  tires on a pickup
> truck and inflate
> them to their max and try to drive on wet pavement.  You'll be lucky to 
> keep
> the
> vehicle under control.   I nearly wrecked my truck once when I bought a 
> set
> of tires
> out of town at a chain tire store who did just that.  My vehicle 
> recommended
> 36 psi.
> The store set them at 50 psi.  I noticed they were very squirrely feeling 
> on
> the way
> home but didn't think much about it until I hit some rain and nearly
> wrecked.  Those tires
> weren't Load range E, they were just good quality load C tires with a high
> max pressure
> rating.
>
> I drove a tractor trailer for many years and we always adjust tire 
> pressure
> to load.  Most of the
> time we were running heavy loads and when we were dead heading somewhere 
> and
> it started
> to rain we had to be very careful.   Tire pressure is often adjusted down
> for running off road on
> soft surfaces as well.  In fact, some tractor trailers now come with a rig
> that allows them to adjust
> tire pressure from the cab of the truck.
>
> Running too much pressure (just because the tire says you can) will cause
> premature wear in the
> center of the tire as well as making the vehicle hard to handle.   If you
> really want to know how to
> precisely set your tire pressure get yourself an infrared thermometer, 
> drive
> the vehicle until the
> tires are warmed up good by going around some curves.  Then stop and have
> someone take
> temperature readings across the face of the tire.  If the temps are about
> the same on all of the
> treads you have them right.  That is how race teams set up their cars for
> racing assuring they
> have maximum tire contact.
>
> Others might have different opinions but I know what has worked for me for 
> a
> few million miles
> in all sorts of vehicles.
>
> Charlie
>
> -----Original Message-----
> From: Jeff & Ginny Pomije
> Sent: Wednesday, May 14, 2014 10:16 PM
> To: at at lists.antique-tractor.com
> Subject: Re: [AT] OT truck tires/driveshaft?
>
> Can't speak to the vibration, but tires show the max PSI that they can
> handle.  That is not the same as what is recommended by the vehicle
> maker.  Usually on the driver's door frame of vehicles is a tag that
> gives the recommended tire pressure for that vehicle.
>
> Jeff Pomije
>
> On 5/14/2014 8:39 PM, jtchall at nc.rr.com wrote:
>> Dropped the air pressure in the front tires to 65 and the vibration
>> dropped
>> to tolerable levels, at times not even noticeable. I had close to 80 in
>> the
>> tires, I'm thinking the tires call for 85 or 90 psi. The guy that sold me
>> those tires says 65 should be fine. I don't understand the discrepancy
>> between what he is telling me and what is listed on the tire.
>> Could vibration with higher pressure be a sign of bad shocks (I guess it
>> has
>> them on the front, haven't looked). Anyway, got a small load of scrap 
>> iron
>> I
>> need to haul. Not enough weight to load the truck but I should be able to
>> get an idea if the vibration is going to be tolerable.
>>
>> John
>>
>>
>>
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