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Old 05-01-2011, 09:49 PM   #1
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Tire Size - Can I Downsize?

My current tires are 315 80R 22.5, which - I am finding out - are not local stocked and are hard to get. Anyone know what the downside - if any - would be of going to 295 80R 22.5? That makes the contact patch just 1 inch smaller and that doesn't appear to me to cause any great concern.

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Old 05-02-2011, 07:09 AM   #2
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The load capacity is significantly less with the 295.

It may not be possible depending on the weight of your coach.

Over 1200# less as a single and over 1300# each less as duals.

That's 2400# less capacity on the front axle and 5200# less capacity on the rear.

Michelin Americas Truck Tires XZA2® Energy™ Page
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Old 05-02-2011, 07:11 AM   #3
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Thanks Dirk - I knew I could count on you!
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Old 05-02-2011, 07:19 AM   #4
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Try Tire Rack - Your performance experts for tires and wheels online- they ship to your local installer and their prices, even with shipping, are very competitive.
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Old 05-02-2011, 08:22 AM   #5
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Thanks Senior - they don't stock the 315 80R 22.5's.

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Old 05-02-2011, 09:54 PM   #6
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tires-easy.com - Details: Michelin XZA 2 Energy 315/80 R22.5 156/150L Double branding 154/150M
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Old 05-02-2011, 10:47 PM   #7
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295's aren't much easier or cheaper to come by than 315's either. I know - I run 295's.

You have to check ALL the specs before changing tire size - RPMs/mile (for speedo accuracy), dual spacing, load capacity vs your axle weights, etc. Once you have all the data, then you can decide.

I just replaced my back tires and went to 11R22.5's (LR H) because they are easier to find and cheaper to buy than the 295/80's. They have a bit less capacity per tire, but are still more than adequate for my rear axle, without even inflating them for max load. I didn't put them in the front, though, cause I need more load capacity there.
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