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Old 05-24-2010, 08:07 AM   #57
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If you weigh your axles and look up the chart you will find you only need about 50 PSI in the duals and the tag axles on a 345. The 280 only about 45 PSI. The softer tire pressures at the rear really improves the ride and takes a lot of vibration out of the coach. Tire life will be better due to even tread wear.

The front tires need 70-85 in most coaches.

Andrew T
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Old 05-24-2010, 05:31 PM   #58
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Greenville , Ohio
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I thought I would provide an update on tire temperatures after I installed the Michelin XZE 225/70R19.5 Tires on the front and drives and 8R19.5 on the Tags.
Ambient temperature 85 degrees farenheit
Full tank of Gas, Full tank of water
Drove 30 miles.
All tires except for Tags 85 psi
Tags 75 psi

Temperature farenheit
Tire inside middle outside
left front 109 123 122
right front 105 117 105
Drive left outer 121 133 132
Drive left inner 127 129 132
Drive right outer 116 129 127
Drive right inner 124 131 130
Tags left 102 122 115
Tags right 101 114 120

I am awaiting for your comments/concerns especially since the Tags are larger tires than the drives.
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Old 05-25-2010, 11:24 AM   #59
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We put Michelin all around...I have noted that the tag axle tires leave scorch marks when doing a sharp turn in a parking lot...GVO makes about 1 mpg difference for us...not much, but I'll take it where it happens...I do like the sanity of a well-made tire, and I believe Michelin is up to that value...just one man's humble opinion...and 5-6 mpg is not a flattering statistic, but it DOES get me down the road...m
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Old 05-25-2010, 01:53 PM   #60
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Quote:
Originally Posted by Andrew T View Post
If you weigh your axles and look up the chart you will find you only need about 50 PSI in the duals and the tag axles on a 345. The 280 only about 45 PSI. The softer tire pressures at the rear really improves the ride and takes a lot of vibration out of the coach. Tire life will be better due to even tread wear.

The front tires need 70-85 in most coaches.

Andrew T
I agree about the ride. When I ran mine that low, I lost about .5 MPG. So, as a compromise I run 70. The ride is still much softer after replacing Toyo and Bridgestone tires with Michelins.
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Old 05-30-2010, 08:24 PM   #61
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As a new member with a 325 Cumins/Allison/ GV unit, I'm trying to figure out what to do regarding carrying a spare. My rig didn't come with one, although it appears that there might have been some provision to carry one under the floor, just forward of the fuel tank. I've got 8r19.5 Michelin XVA's all around, except the tags (which are Coopers, same size).
Forgive me if I'm being dense, but are those of you with spares carrying mounted tires, or just the rubber? And if the tires are mounted, what wheel do you have the tire mounted on? It appears that the front wheel is quite different from the rears.

Many Thanks,
Charly.
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Old 05-31-2010, 04:27 AM   #62
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Hello streamquest, My 345 has a spare

a steel wheel complete and ready with rubber, I assume ? for the drive, tag axle
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Old 06-01-2010, 12:33 AM   #63
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Thanks John.

Is it safe to assume then that a flat on the front will still leave you stranded since the rear wheels would not fit up front?

Charly.
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Old 06-01-2010, 07:46 AM   #64
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As a Noob here I also looked at the front and rear wheels and thought they were very different.
In fact on my 345 they steels, and are all the same... the offset of the wheel rim is mounted inside on the front, and the inner drive axle, and the outer drive axle and the tag they are mounted offset out... if that makes sense!
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Old 06-01-2010, 09:08 AM   #65
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On our 345 I annually replace the front tires with new and then rotate the front tires to the tag. All the wheels are the same bolt pattern and I can move tires where ever I want. The only steel wheels I have are the inside duals on the drivers.
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Old 06-02-2010, 06:50 AM   #66
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Thanks John.

Is it safe to assume then that a flat on the front will still leave you stranded since the rear wheels would not fit up front?

Charly.
No, You Just reverse the wheel, Inside out

where you in Florida this past winter streamquest ?

we visited with some nice airstreamer's from Mass.

down Saint Augustine way
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Old 06-02-2010, 01:02 PM   #67
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Quote:
Originally Posted by gunner View Post
I thought I would provide an update on tire temperatures after I installed the Michelin XZE 225/70R19.5 Tires on the front and drives and 8R19.5 on the Tags.
Ambient temperature 85 degrees farenheit
Full tank of Gas, Full tank of water
Drove 30 miles.
All tires except for Tags 85 psi
Tags 75 psi

Temperature farenheit
Tire inside middle outside
left front 109 123 122
right front 105 117 105
Drive left outer 121 133 132
Drive left inner 127 129 132
Drive right outer 116 129 127
Drive right inner 124 131 130
Tags left 102 122 115
Tags right 101 114 120

I am awaiting for your comments/concerns especially since the Tags are larger tires than the drives.
With consistant center of tire warmer I would reduce air pressure, to get the numbers more consistent.
What was the basis for the 85# if not a weight based number, I would reduce front to 80 recheck numbers and maybe even 75 and check.
I have found I get a difference on the sunny side of the vehicle if the right was sunny the front would be right but rear doesn't match.
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Old 06-02-2010, 04:30 PM   #68
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Thanks again John,

I was definitely not in Florida.
I just purchased my rig this past winter, and have spent most of the time since then tearing it apart. I'd like to think that I'm on the "comeback trail" at this point, but I still have a LOT of work to do.

As far as the tires go, I have Alcoa aluminum wheels on all six. Do you know if a spare mounted on a steel wheel would replace any/all of them in a pinch? I'm guessing "yes", but I'd like to be sure before I buy one.

Charly
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Old 06-03-2010, 02:48 AM   #69
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Thanks again John,

I was definitely not in Florida.
I just purchased my rig this past winter, and have spent most of the time since then tearing it apart. I'd like to think that I'm on the "comeback trail" at this point, but I still have a LOT of work to do.

As far as the tires go, I have Alcoa aluminum wheels on all six. Do you know if a spare mounted on a steel wheel would replace any/all of them in a pinch? I'm guessing "yes", but I'd like to be sure before I buy one.

Charly
Yes Charly, that would work I believe

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