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Old 10-22-2009, 02:33 PM   #1
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Tires

I have a 2005 Vectra with 255/80 R22.5 XRV tires. I am looking for new tires. Michelin 275/80 22.5 XZA3 or Goodyear G670 275/80 22.5. Tires Has any one replaced there 255 tires with 275, is there enough clearance. And what is the feeling on either the Michelin or Goodyear. Thanks for the help.
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Old 10-22-2009, 07:06 PM   #2
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I replaced mine with 275/70R22.5 LRH Goodyear G670 RV tires a while ago. There is only a small difference in circumference, but I did have the 'Vehicle Speed Cal (R/Mile)' parameter in the Cat ECM updated from the original 2585 to 2619 to match the new tires (548 rev/mi for the new tires times the rear end ratio of 4.87). This keeps the speedometer/odometer accurate.

The biggest advantage is that these are Load Range H tires (one step up from the original Gs) and they can be run at a lower tire pressure for a more comfortable ride while having much more reserve capacity. The Goodyear load charts require 90psi front and rear for the 36RD verus the 110psi needed for the original 255s)--I actually run 95psi the give myself a little margin.
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Old 10-23-2009, 10:31 AM   #3
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My 2005 Vectra came with 275/80R22.5 but it's a 40 footer, plenty of clearance once the bags are up.
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Old 10-23-2009, 10:44 AM   #4
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Here's asite that might help
www.michelinrvtires.com/assets/pdf/RV_Brochure.pdf
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Old 10-23-2009, 10:26 PM   #5
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Quote:
Originally Posted by cbeierl View Post
I replaced mine with 275/70R22.5 LRH Goodyear G670 RV tires a while ago. There is only a small difference in circumference, but I did have the 'Vehicle Speed Cal (R/Mile)' parameter in the Cat ECM updated from the original 2585 to 2619 to match the new tires (548 rev/mi for the new tires times the rear end ratio of 4.87). This keeps the speedometer/odometer accurate.

The biggest advantage is that these are Load Range H tires (one step up from the original Gs) and they can be run at a lower tire pressure for a more comfortable ride while having much more reserve capacity. The Goodyear load charts require 90psi front and rear for the 36RD verus the 110psi needed for the original 255s)--I actually run 95psi the give myself a little margin.
Could you tell any difference in the ride roughness between the 80 series and the 70 series? I have always heard that the 80 series, having a little wider side wall , will ride a little softer than a 70 series having a narrower side wall. But maybe being able to run less air pressure makes up the difference in ride.
I am currently running the 255/80s but upon the next replacement I am considering the 275/70s to be able to go from load range G to the H rating but since it rides rough enough as it is I sure don't want to add to that.

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Old 10-23-2009, 11:35 PM   #6
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Quote:
Originally Posted by wagonmaster2 View Post
Could you tell any difference in the ride roughness between the 80 series and the 70 series? I have always heard that the 80 series, having a little wider side wall , will ride a little softer than a 70 series having a narrower side wall. But maybe being able to run less air pressure makes up the difference in ride.
I am currently running the 255/80s but upon the next replacement I am considering the 275/70s to be able to go from load range G to the H rating but since it rides rough enough as it is I sure don't want to add to that.

Wagonmaster2
2004 Meridian 36G
The ride is definitely improved with the 275/70s over the 255/80s. I suspect it's mostly due to being able to run 95psi rather than 110psi all around, but in any event the ride over bumps/joints/etc. is no where near as harsh. In addition, I'm much happier being in the middle of the load range for the tires rather than at the extreme upper limit.
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Old 10-24-2009, 09:00 PM   #7
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Thanks Chris.

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