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Old 06-30-2019, 06:26 AM   #1
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Tire size change

I have a 2001 national dolphin. The OEM tire size is 245/70/19.5. For some reason the previous owner put drive tires on the steer axle. They are now cupping really bad. The OEM size seems harder to find than
225/70/19.5. I have already researched the size differences. I am okay with the slight drop in tire height. I will only lose about 3/4" in width. I am only looking to change the steer tires now. Would it hurt to change the tire size on the fronts now and leave the rears the OEM size till I'm ready to replace.
the replacement tires will/ should meet load ratings.
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Old 06-30-2019, 06:43 AM   #2
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The cupping isn't due to tire design.
I would have the alignment and balance checked before I replaced the tires.

As far as a bit smaller tire, as long as they are designed to carry the weight of the front axle, they should be fine.
The important thing is not to overload them.
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Old 06-30-2019, 06:46 AM   #3
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For Goodyear G670 tires the load ratings are 3,640 lbs Vs. 4,540 lbs. I would NOT give up that load carrying capability.
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Old 06-30-2019, 06:47 AM   #4
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No I do not believe so. The coach tracks okay. The tires on there now were not designed for the steer axle. The outside "knobs" are cupping creating vibration and bad road noise.
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Old 06-30-2019, 06:52 AM   #5
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Ford Super Duty Owner
Join Date: May 2007
Location: El Cajon CA
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245/70/19.5 tires are available all over the US. and internet. IT is a standard size on the 2019 Ford RV chassis
2007 Sea Breeze LX 8321 Ford Chassis
2004 Ford Ranger Edge
El Cajon CA.
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Old 06-30-2019, 10:24 AM   #6
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As long as you put the same size tires on both ends of the same axle you will be alright.
PS; roll out distance is the important factor on tire size.
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