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Old 08-14-2012, 02:35 PM   #1
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tire trouble

I have a 36 foot pace arrow motorhome cummings diesel pusher
On a recent trip my to rear inside duels blue the side walls out
I was told that it was do to the age of the tires
I plan on changing all six tires ,
mine are 235 80 r 22.5 i would like to know if i can put 255 80 r 22.5 to increase load
Capacity
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Old 08-14-2012, 02:40 PM   #2
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Welcome to IRV 2 If they're wider ( and they probably are ) they would create a dangerous tire rub situation.
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Old 08-14-2012, 02:42 PM   #3
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You will need to find out the clearance needed between the tires. If not enough clearance they will "kiss" and blow out due to the heat generated.
The tire manufacturer will have published figures on the required clearance/offset. They larger tires will also change you gear ratio slightly as they will be larger diam. too.
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Old 08-14-2012, 02:48 PM   #4
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Welcome to the forum. Glad nobody was hurt during the two blowouts. Running old tires is risky business so good move getting new shoes for it!

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Old 08-14-2012, 02:55 PM   #5
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Looking up Michelin tires, It only changes the maximum load rating for duals by 300 lbs. The diameter will change, so your speedometer/odometer will be off. You might also have clearance problems between the duals, and be sure your rims are wide enough to handle the 255 80r 22.5 size. Just changing tire size doesn't automatically make your RV safe to handle heavier loads, you have to consider suspension, axles, etc.

By the way, 300 lbs. is only equal to about 36 gallons of water.
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Old 08-14-2012, 08:59 PM   #6
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Did they have enough air in them? Inside blowouts are quite often caused from under inflation. This can cause them to over heat and the heat will not dissipate as easily on the inside wheels.
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Old 08-14-2012, 09:36 PM   #7
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If you have a W22 chassis you may find your wheels are only wide enough for the 235. Mine are 6.75" I think. It must have saved them $4.00 per vehicle to put such a narrow wheel on.
If you are an FMCA member you can get a super deal on Michelin tires.
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Old 08-14-2012, 11:00 PM   #8
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Super Wrench what year is your Pace Arrow, I have never heard of a diesel pusher Pace Arrow.
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Old 08-15-2012, 05:45 AM   #9
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Quote:
Originally Posted by Pete & Linda
Super Wrench what year is your Pace Arrow, I have never heard of a diesel pusher Pace Arrow.
I posted this link the other day in the FW forum http://fleetwoodrv.com/partsandservi...ualsByYear.asp .

It shows PA Diesels in 93&94.
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Old 08-15-2012, 08:42 AM   #10
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Yeap, Fleetwood made Pace Arrows with a diesel for a couple years back around 1994. Southwinds too.
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Old 08-15-2012, 08:44 AM   #11
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Thanks Cliff
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Old 08-15-2012, 08:45 AM   #12
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I don't see that much of anything is gained by changing to the 255's. I think you will find that the 235/80's have more than sufficient weight capacity for your coach GVWR, so why go through the worry of dual spacing, front wheel well room, speedometer changes, etc.?

You cannot increase your coach weight rating simply by increasing tire size, if that is what you were thinking.
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