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Old 07-03-2012, 11:12 AM   #1
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new tires

I am changing tires on a 1992 P32 chevy motorhome. It has 8R19.5 tires. Is there enough spacing for a changeover to a 245R7019.5 ?
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Old 07-03-2012, 02:25 PM   #2
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If you can't get the section width specs on your existing tires to compare to the 245/70's, you will just have to measure and see what the difference is.

Goodyear lists their G647 245/70's as have a width of 9.5". Goodyear G647 8R19.5's have a width of 8.3", so the difference is large and I doubt if you have enough extra room for that. You will probably have to crawl underneath and measure the space between the tires you have now to get an idea, but I suspect it is on the order of 1.0-1.5". I would not want to see less than 1" on my own rig.

Other brands or tire models will be a slightly different, so get the actual width for the tires you are considering, then compare.
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Old 07-03-2012, 05:18 PM   #3
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What brand of new tires are you going with? And may I ask why you chose the brand? I'm looking for new tires and there is much debate as to cost/ride/longevity, etc.
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Old 07-03-2012, 06:05 PM   #4
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I just put 6 Sumitomo ST718 245R19.5 LR F on my MH. Haven't had a trip with them yet. However I do have the specs. Minimum dual spacing for 8R19.5 is 9.2", minimum dual spacing for 245R19.5 is 11". I don't think the 245's will work for you. Sumitomo ST918 is a drive only tire and they have 225's and 245's in 19.5" tires, both have minimum dual spacing of 10.0". The 225's come in Load Range F and G and have a section width of 8.8", the 245's have a section width of 9.5 and are LR G. The 225's might work for you. But why not just stick with the 8R19.5? The ST718 8R19.5 are LR F only.
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Old 07-03-2012, 07:22 PM   #5
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Quote:
Originally Posted by ChasA
I just put 6 Sumitomo ST718 245R19.5 LR F on my MH. Haven't had a trip with them yet. However I do have the specs. Minimum dual spacing for 8R19.5 is 9.2", minimum dual spacing for 245R19.5 is 11". I don't think the 245's will work for you. Sumitomo ST918 is a drive only tire and they have 225's and 245's in 19.5" tires, both have minimum dual spacing of 10.0". The 225's come in Load Range F and G and have a section width of 8.8", the 245's have a section width of 9.5 and are LR G. The 225's might work for you. But why not just stick with the 8R19.5? The ST718 8R19.5 are LR F only.
On the Sumitomo site they show a 14 ply G load rating ( ST718 225/70R19.5 14pr) all position tire as well as the 12 ply F load rating (ST718 225/70R19.5 12pr) if you don't want to stick with the 8R19.5. But I can't see the real difference between the two.
http://www.nextag.com/Sumitomo--2700...9.5/brand-html
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Old 07-03-2012, 08:47 PM   #6
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The difference is 8/10 of an inch in dual spacing. I don't know if that would be a problem or not.
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Old 07-03-2012, 09:48 PM   #7
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His rims arn't wide enough for 245's they have to be 6.5" and 8r rims or only 6"
He can go with 225/70/19.5
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Old 07-04-2012, 04:58 PM   #8
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Quote:
Originally Posted by ChasA View Post
I just put 6 Sumitomo ST718 245R19.5 LR F on my MH. Haven't had a trip with them yet. However I do have the specs. Minimum dual spacing for 8R19.5 is 9.2", minimum dual spacing for 245R19.5 is 11". I don't think the 245's will work for you. Sumitomo ST918 is a drive only tire and they have 225's and 245's in 19.5" tires, both have minimum dual spacing of 10.0". The 225's come in Load Range F and G and have a section width of 8.8", the 245's have a section width of 9.5 and are LR G. The 225's might work for you. But why not just stick with the 8R19.5? The ST718 8R19.5 are LR F only.
I retired as ser. mgr. for a large motorhome co. in 2008. In four years I am sure things have changed a lot. I need tires for a customers unit and it has been several years since I went to tire school. At seventy two I have forgot a lot, so I wanted to check on the latest info. I don't want to go with a 8R19.5 because they are truck tires and not designed spec. for a motorhome. Motorhome tires are designed to sit and be exposed to weather and the elements. MH tires never wear out they always go out of date. Truck tires wear out quickly and time is not a major factor.
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Old 07-04-2012, 08:09 PM   #9
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I don't know of any rv specific tires other than Goodyear G670RV and Michelin XRV. I'd go with truck tires and keep them covered while sitting (I prefer black covers because they stand up to to sunlight better). I'd also keep a good liberal coat of Aerospace 303 to protect them when covering isn't practical.
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Old 07-06-2012, 03:33 PM   #10
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Anyone heard of or have experience with Cooper Mastercraft RM 170's?
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