[AT] truck tires; now pressures

Steve Offiler soffiler at gmail.com
Thu May 15 16:45:44 PDT 2014 

Not necessarily over-inflated.  (If you are, that's way safer than under-inflated).   

Using my truck ('97 F-250HD, 8600lb GVWR) the tires are 235/85-16 10 ply load range E.  The tires are 80psi max and that sticker tells me to run 80 psi.  If I follow the sticker, I am good to run at max GVWR.  I am pretty sure this is standard practice I the industry.  

SO

Sent from my iPhone

> On May 15, 2014, at 5:29 PM, Mike <meulenms at gmx.com> wrote:
> 
> I didn't realize that Steve, so basically I'm over-inflating my tires 
> when I haul? We haul horses in our goose-neck and I watch our tire 
> pressure very carefully, especially with 3 on board in the summertime. 
> It's amazing to me how many people don't, and are perplexed as to why 
> they blew a tire going 85 mph down the highway on a 90 degree day on 
> tires that were under inflated and 10 years old. :)
> 
> Mike M
> 
>> On 5/15/2014 2:02 PM, Stephen Offiler wrote:
>> Respectfully disagree there, Mike.  Tire pressure ratings are provided by
>> the manufacturers for pickup trucks as well as passenger vehicles.  In the
>> case of pickup trucks, the pressures relate to the truck hauling at max
>> GVWR.  Pretty much the opposite of what you just said if I read you
>> correctly.
>> 
>> SO
>> 
>> 
>>> On Thu, May 15, 2014 at 1:12 PM, Mike <meulenms at gmx.com> wrote:
>>> 
>>> 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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