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Old 11-09-2013, 09:54 AM   #1
2 Rivet Member
1991 30' Airstream 30
Lake Luzerne , New York
Join Date: Dec 2012
Posts: 49
Tires - 8R19.5 to 225x70x19.5 thoughts?

As the older tires are getting harder to find for our Classic motor homes (mine is a 300LE) I am wondering if anyone has switched to the 225x70x19.5 or the 245x70x19.5 tires and if there seems to be any difference in driving, safety, etc.
Thanks in advance for any thoughts or suggestions.

"Polishing away in FL"

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Old 11-11-2013, 04:58 AM   #2
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1989 34.5' Airstream 345
Saint Petersburg , Florida
Join Date: Apr 2010
Posts: 1,619
Images: 28
I recently bought tires and was told under NO CIRCUMSTANCES would the 225x70 would fit on the dually axle. Tires would be much too close at sidewall area.

Good Luck, Derek

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Old 11-11-2013, 06:16 AM   #3
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I'm in the , US
Join Date: Sep 2012
Posts: 534
OK, here's the scoop:

An 8R19.5 is 8.0" wide on a 6" rim (with an allowable rim width range of 5.25 to 6.75", a diameter of 33.8" and a minimum dual spacing of 9.1", and a load carrying capacity of 3525# at 110 psi (single, Load Range F)

A 225/70R19.5 is 8.9" wide on a 6.75" rim (8.6" on a 6" rim), with an allowable rim width range of 6" to 6.75" and a diameter of 31.9", a minimum dual spacing of 10.0" ( 9.7" for a 6" rim) and a load carrying capacity of 3640# at 95 psi (single, Load Range F)

A 245/70R19.5 is 9.8" wide on a 7.50" rim with an allowable rim width range of 6.75" to 7.50", and a diameter of 33.3", and a minimum dual spacing of 11" with a load carrying capacity of 3860# at 95 psi (single, Load Range F)


I think the 225/70R19.5 is a much better choice. It is much more likely to fit.

- BUT -

- If the rim is 5.25", then the 225/70R19.5 is a No Go.

- The 225/70R19.5 needs 0.3" more clearance between the frame and tire. This can be difficult to check as the worst condition is when the steering wheel is fully turned AND the suspension is fully collapsed. I'd advise getting someone who is knowledgeable about truck suspensions to look at this.

- And the minimum dual spacing could be a problem and needs to be checked.
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Old 11-11-2013, 07:56 AM   #4
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1984 34.5' Airstream 345
Greenville , Ohio
Join Date: Mar 2006
Posts: 311
I am running Michelin 225/70R19.5 on mine except for the Tags ( not enough clearance). Have had no problems. Tires are wider than the old Goodyears and handling seems to be slightly better.
1984 Motorhome 345
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