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Old 09-25-2017, 05:17 PM   #1
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Tire size question

Just landed a 2004 HRpdd Admiral 30' in excellent condition.

As I was reading over the HR spec sheet I noticed that the Ford chassis is listed with 245/70r19.5 tires and the Workhorse is listed with 225/70r19.5 tires.

Just curious with the difference. HP and torque very close and the GMC's torque is actually at a shade lower rpms. I would have thought tires would be the same. Rim widths are identical as far as I can tell.

Any ideas. Not really important except that my curiosity is piqued.

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USMC retired
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Old 09-25-2017, 05:26 PM   #2
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Welcome to iRV2 .

The telling factor for tire sizing could be the axle weight rating vs the tire load rating and how close to the tires load rating the different chassis manufactures decided to run.
Engine power probably didn't factor in .
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Old 09-25-2017, 06:07 PM   #3
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... and welcome to the HR Admiral family!

I can't speak to the Workhorse specs, but occasionally Ford lists the "required" tire size in the Body Builders Layout Book for that model year. A link to the appropriate section for the 2004 Book is here. See sheet 1: "Wheels and Tires."

If you want wiring diagrams for a 2005 Monaco Monarch (sister to the Admiral), send me a private message that includes your e-mail address and I'll forward them to you. Instructions on how to send a private message are here.

You should add a signature to your profile, too. Instructions here.
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Old 09-25-2017, 06:48 PM   #4
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245's are 20 mm's wider than 225's.
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Old 09-25-2017, 10:21 PM   #5
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I think on the Workhorse chassis the P225/70-19.5 were used on the P-32 chassis models, and the P245/70-19.5's were used on the W series chassis that had 19.5 inch wheels. That at least is the way it was with the Safari Trek's like mine. I think the wheels on the W series were .5 inch wider than the P series, and they had a different lug nut pattern / size.
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Old 09-26-2017, 09:16 AM   #6
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Hi ! Welcome to IRV2! We're sure glad you joined the gang!

Congrats on the new rig! Keep her between the ditches!

Sorry I can't answer your question.

Good luck, happy trails, and God bless!


Thank you for your service to our country!
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Old 09-26-2017, 09:34 AM   #7
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Is the Workhorse chassis rated for less weight? That would be the only reason I could see.
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Old 09-28-2017, 11:10 AM   #8
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Tire size question resolved

Thanks for the info. Pulled the VIN (which I should have known to start with) to find that the chassis is a P30. I may have looked at the SE and didn't realize it.

New question. As long as I don't exceed the weight limit and the wheel width will accommodate it, are there any advantages to up sizing to a 245 tire?
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