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Tires, Wheels, Brakes, Steering and Suspensions Discussion of preventative/corrective maintenance and other technical issues regarding your coach's Tires, Wheels, Brakes, Steering and Suspensions and related components.

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  #1  
Old 05-10-2019
InfiLights's Avatar
InfiLights InfiLights is offline
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Default 88 PT40 tires

Hello all,

What are the correct tires for a 88 PT40 ?
I am looking at Myna's bus and I see a 315 80r 22.5 in one of the pictures. Are they the correct tire for the 88 or should they be 12R 22.5 ?

If the rims are the original narrow ones for stock 12r22.5 tires you can get away with 315's on the steer and tag but the 315s are wider and will touch and rub on the drive axle......
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Old 05-10-2019
DW SD DW SD is offline
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I bought 12Rs for my old PT. 315/80s weren't available (in the US at least) when these great RVs were born. I believe 315s are usually more expensive too.

Also, there is likely a tire placard on one of your bays that specify tire size. Have you seen that?

Have you looked at the tire / weight charts provided by each tire brand? They can be found via internet search.

BTW - the 315 and 12R is only about an inch difference in circumference. They have extremely similar dimensions, which is why they are often used interchangeably. But the mfg will specify pressures, rim width, weight capacity, etc. Sometimes, they also make different ply tires, in a given size, which allow greater capacities too.

If you simply take my word for it, I'd probably seek a 12R, since it will likely be the original size and less expensive.

Doug
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Old 05-10-2019
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A lot of us are running 315's all around on the 8.5 rims, no issues.
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Old 05-10-2019
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Thanks. That is good news....so no rubbing and touching on the drive axle using 315s on standard rims on the drive axle as well ?
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Old 05-10-2019
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My 315's have 49K miles on them, no issues.
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Old 05-10-2019
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What ever has the most circumference.
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Old 05-11-2019
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I went to 315's on the front after getting the bus weighed.
If I remember, my front end was over 13k on it and I figured that doing some bouncing down the road but strain on the original size.
The 315's are rated for 15k, so got those.
No problems with them and they have been on for 3 years now.
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Old 05-11-2019
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Since its a M380 this may not help. But mine came with 12R’s all around on 8.5 rims & I’m using a TPMS. Tires would get HOT and pressures would go way up during AZ summers. Went front - 315’s & Rear - 295’s on same rims. Tire weight carrying capacities for either dependent on rim size, with 8.5’s being less than 9.0’s. With new tires, according to manufacturers chart am able to run lower pressures carrying the same weight. Summer tire temps and ride improved. Speedo not noticeably affected and duals in rear not chafing. 12R’s may be harder to find.
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Old 05-11-2019
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The 12R22.5 are available but they usually are older DOT date
codes because they are not moving from inventories. 315s are fresh tires most places I had them quoted .
The only concern I had was the touching and rubbing on the drive axle but if you guys say it is ok, I will order 315s.
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