Tire fitment question

[Joe Garner]

Ya,

The only time we had it weighed the front was 12,800#

/Joe

On Fri, Mar 15, 2013 at 9:46 AM, Don Bradner <"bluethunder@arcatapet.com"> wrote:

 

Am I correct in assuming your front axle GAWR is less than 14,000 lbs, being a non-widebody?

On 3/15/2013 at 9:23 AM Joe Garner wrote:



>Just checked mine.

>

>

>Firestone aluminum, 8.25 x 22.5, Max load 7000# @ 120psi.

>

>'87 PT40

>

>/Joe

>

>

>

>

>On Fri, Mar 15, 2013 at 5:49 AM, Michael Bulriss <"mbulriss%40yahoo.com">

>wrote:

>

>> **

>>

>>

>> To add to this discussion, my aluminum wheels are stamped 7250 lbs at 120

>> psi. The 12R22.5 tires are labeled 7390 lbs at 120 psi for single wheel

>> use.

>>

>> More importantly the tire charts specify that the duals have a minimum

>> 13.2" spacing with the 12R and minimum of 13.8" with 315s. Measuring the

>> current rear spacing on the 8.25 wheels with 12R tires shows them barely

>at

>> the 13.2 minimum spacing, so I am concerned how people are mounting 315s.

>>

>> FWIW, one Michelin chart shows the 315 tire max load at 8000 lbs on 8.25

>> wheels versus the 9090 with 9.0 rims. Seemed like a dramatic change.

>>

>> Decisions, decisions. Having a head time deciding next step since I am

>> just updating the steers currently and moving those tires to the tag. I

>had

>> thought the slightly wider 315 would make a difference on the steers,

>> because even when i changed from 7.5 to 8.25 wheels on the 83PT and

>stayed

>> with 11R tires, it made a big improvement in driving feel by widening the

>> tire cross section out. FWIW.

>>

>> Mike Bulriss

>> 1991 WB40 "Texas Minivan"

>> San Antonio, TX

>>

>>

>> Sent from my iPhone

>>

>> On Mar 15, 2013, at 12:43 AM, "Don Bradner" <"bluethunder%40arcatapet.com">

>> wrote:

>>

>>

>>

>> Is that your Wide Body with that 7000 lb rating?

>>

>> Clearly, Alcoa has made a lot of different rims at 8.25 inches over the

>> years. I wish I had a WB sitting in front of me so I could look, but I do

>> know that mine were not below the '90's 14,600 front axle rating, which a

>> 7,000 lb would have been. In the current Alcoa book they list several

>> different 8.25 22.5-inch wheels, with ratings as high as 8050 lbs, but

>none

>> lower than 7300.

>>

>> At 110PSI, the 12R is rated for 6870 lbs in a single tire configuration,

>> which would be underinflated for any of the 90s wide bodies. They all

>> needed a full 120PSI to carry the full weight. I'm surprised an 88WB

>> wouldn't weigh that much.

>>

>> The ride difference between a 12R at 120 and a 315 at 100 IS noticeable.

>>

>> The rubbing when suspension-dumped with steering turned had nothing to do

>> with pressure. It is a phenomenon on most, if not all, of the wide-bodies

>> at any pressure.

>>

>> On 3/15/2013 at 5:23 AM tulipvendor50 wrote:

>>

>> >Don stated:

>> >"Alcoa documents list 8.25-inch rims variously as 7400 lbs"

>> >

>> >Bill:

>> >There is a coach right next to me with 8.25 inch rims and it clearly

>> >states "7000lbs"

>> >

>> >Don stated:

>> >"As far as the fenders I had the older rubber ones, and the tires would

>> >hit when dumped-while-turned even with 12R - the extra half-inch of

>tread

>> >on the 315 made no difference. I did NOT put 315s on the drivers because

>> >of the potential rubbing issues. Those that have done so (Shane comes to

>> >mind) run their drivers at higher pressure than needed for the load,

>which

>> >negates the ride improvement. "

>> >

>> >Bill:

>> >I run my tires at 110lbs pressure and have had no problem with the

>> >rubbing. I doubt very much if one could really feel the difference in

>> >ride with the higher or lower pressure.

>> >

>> >

>> >

>> >

>> >------------------------------------

>> >

>> >Yahoo! Groups Links

>> >

>> >

>> >

>>

>>

>>