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Old 07-31-2020, 08:01 AM   #1
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Tire Question

I may be over thinking this (something I've never really been accused of....) but has anyone put drive tires on that axle and trailer tires on their tag? I searched the threads and didn't see this question. My thought is trailer tires are more resistant to scuffing and have a lower rolling resistance. Drive tires for less than perfect roads/wet traction. Currently have all position tires on all three axles. Did upgrade to 305/80/22.5 on the steer resulting in an improved ride.
Thanks.
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Old 07-31-2020, 10:50 AM   #2
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Haven't done it myself, but don't see any reason not to.

What brand 305's did you put on your steer axle? Any concern trying to find a replacement in a hurry if needed?
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Old 07-31-2020, 01:05 PM   #3
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Toyo 144's. Not too concerned about a quick replacement, most places have them or can get them in a day. Worse case the 295 75 is only one inch shorter so that end of the axle would be 1/2 inch lower. If i put that on the driver's side it might even out the crown on some roads.
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Old 08-01-2020, 05:25 AM   #4
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I do not see the 305/80/22.5 size listed by Toyo for their M144. Do you mean 315/80? or 305/70?
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Old 08-01-2020, 10:42 PM   #5
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Correct should have been 315
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Old 08-02-2020, 12:25 AM   #6
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In your size trailer tires probably have lower speedrating, and by that a higher maximum load.
So also for trucktires, as yours in fact are, trailertires are more a limitation then an upgrade.

If higher maxload/loadindex, then more deflection so more heatproduction so more rolling resistance.
But this then you can compensate by using the same pressure as if it was a drive-tire.

RV tires mostly have lower maxload by higher speedrating. Yust by the way they calculate it, in fact they are pretty similar as trucktires.

Andvyou are not allowed to put different sises on an axle, as you suggest. That is if rules are the same in America as in Europe, wher I live.
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Old 08-02-2020, 06:29 AM   #7
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Many manufacturers de-rate the 315/80r22.5 tires when used on 8.25" wheels. Some do not recommend them used on 8.25's at all. I recall that Michelin used to derate, now just does not recommend 315's on an 8.25. Not sure about Toyo, but it might be worth checking out if warranty could be an issue.
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Old 08-03-2020, 09:20 AM   #8
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In response to your question -- the 315 series tires should be mounted a 9" wide rim - 8.25" rim is too narrow for the 315/80R22.5.
Hope this answers your question and safe travels to you and your family
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Old 08-03-2020, 10:40 AM   #9
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Quote:
Originally Posted by RV_TireMan View Post
In response to your question -- the 315 series tires should be mounted a 9" wide rim - 8.25" rim is too narrow for the 315/80R22.5.
Hope this answers your question and safe travels to you and your family
The puzzling thing is that some tire makers do not quite have that requirement, or are "walking back" what they might have said earlier.
Here's the Continental spec on their HR2SA which allows 315/80R22.5 tires on 9.25 rims but downrates their capacity to 7610#@120psi. Note that the 295/80R22.5 tire is listed at a capacity of 7830#@120psi.


I know many, like Michelin, used to derate their 315's when used on an 8.25 wheel but now no longer recommend that combination "for vehicles produced after Jan ]1, 2018". Sounds like lawyer language to me. Here's their page for the X-Line Energy Z.
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