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Old 04-12-2011, 04:28 AM   #1
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Tire Size - Different Front to Rear?

Hi all... I ma hoping someone has some good factual information here beyond the obvious.

I recently picked up my new to me coach and the dealer told me they put new tires on the front. When I got it home and tried to put my tire covers on I could not get the front ones to cover the whole tire. I checked the tire size and found the fronts are 80 series while the rears are 70s.

Monaco calls for 70s all around.

When I called the dealer they asked if the anti-lock warning had come on which it had not. So they said its not an issue then and are balking at changing out the tires to the right size.

Anyone have any thoughts about this. Obviously they are the wrong size and Monaco spec'd the size they did for a reason, but other than that, what's my argument to the dealer to get them changed.

Thanks!
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Old 04-12-2011, 06:14 AM   #2
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Many motorhomes come with different size tires on the front vs the rear.
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Old 04-12-2011, 06:40 AM   #3
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The first thing I would check is the load capacity of the tires to be sure they can carry the maximum weight that the front axle is rated for. The maximum load rating for the tires can be found molded into the sidewall. The weight rating of the axle can usually be found on a plaque or sticker near the driver's seat.

The next thing I would check is to be sure there is enough clearance in the wheel well for the tires. 80-series tires have a taller section (distance from wheel rim to tread) than 70-series tires. That means they are a larger diameter than 70-series tires for a given width. You have already discovered this since you say the tire covers do not fit. Turn the steering wheel all the way in both directions and check underneath to make sure there is still plenty of clearance. Make allowance for the fact the suspension will travel up and down when moving. Size substitutions can be made, but the differences in tire width and height as well as load capacity should be taken into account.
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Old 04-12-2011, 07:30 AM   #4
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You can do the math to get your answer. A 70 tire height is 70% of the width (ie a 295/70 tire is 206.5 mm high from the rim) where as an 80 tire is 80% of the width (ie a 295/80 is 236 mm high). The difference in height would be a problem. To get the same tire height the 70 tire would have to be a 290/70. That being said, some narrower tires (80) were used on the front to aid in steering (less road contact). The problem here is getting the right tire width (265/275/285/295) to match the height after you do the math.


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Old 04-12-2011, 07:46 AM   #5
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I increased the tire size on the front of my Signature from a 295/80r22.5 to a 315/80r22.5 because it changed the Load Range from a an H to a L. Check and see if there is a increased Load Range on the front tires.
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Old 04-12-2011, 05:56 PM   #6
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I would check the DOT dates to see if they are really new tires.
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Old 04-14-2011, 11:18 AM   #7
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tire sizes

I was surprised to hear you mention a 70 series motorhome tire. Most are 75 or 80 aspect ratio. Michelin tires are usually 80 series such as 255/80 R 22.5 Most other brands are 75 series such as 265/75 R 22.5. Since Michelin is the only one I am aware of with the 80 series you have to be careful when replacing with 75 series so the revs per mile are nearly identical particularly if on the rear as duals since the difference would affect the differential. What brand are the new tires and the old ones on the rear? do all the sizes match? I am sure other will jump in here with more info. The issue on date codes is also important for a vehicle that sits with out many miles used. The code is DOT WWYY meaning what week and year was the tire made; the newer the better. DACOTAH
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Old 04-14-2011, 05:13 PM   #8
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Quote:
Originally Posted by paz View Post
The first thing I would check is the load capacity of the tires to be sure they can carry the maximum weight that the front axle is rated for. The maximum load rating for the tires can be found molded into the sidewall. The weight rating of the axle can usually be found on a plaque or sticker near the driver's seat.
I'd check the rating of the rims too, make sure they can handle the extra weight.
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Old 04-15-2011, 02:36 AM   #9
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The factory sticker on the wall beside the drivers seat says 70 series all around. The rears are 70s but the new fronts are 80s. I should also mention that my last coach, another Holiday Rambler, also called for 70s. By the way, the new tires are Goodyears.
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Old 04-15-2011, 09:19 PM   #10
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I hope that you realize that changing the load range doesn't change the max amount of your MH.It still goes on the max axle capacity,not the tires load range.
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