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Old 11-18-2010, 08:55 PM   #1
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can you replace old 8R 19.5 tires with 245/70R/19.5 tires

I have a family member who just bought a 93 HR that needs tires can he replace them with the 245/70R/19.5 in place of the old 8R/19.5 tires? When mounted theres only like 3/4 to 1 inch between the rear tires. what can he do to make them work?


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Old 11-19-2010, 06:06 AM   #2
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Originally Posted by IntruderF350 View Post
I have a family member who just bought a 93 HR that needs tires can he replace them with the 245/70R/19.5 in place of the old 8R/19.5 tires? When mounted theres only like 3/4 to 1 inch between the rear tires. what can he do to make them work?

That doesn't sound good. I don't have any technically supported figures but based on my coach I would want to see approx. 3" between duals.

Going to the tire specification table for the size in question might show the minimum dual-spacing. You'd need to subtract the width of one tire from that number, and measure between equivalent points on the two tires to get a rough estimate.

For example measure from the outer-most rib of the outer tire to the outer-most rib of the inner tire. Subtracting that distance from the Minimum dual spacing gives an indication of the gap between the tires.

There are other ways to get better estimates, but this should help.

Also, you need to pay attention to Revolutions per Mile since large differences between old and new tires will show up on the speedometer and odometer.

Ken 1996 Safari Sahara- 3530, 35', CAT 300
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Old 11-19-2010, 06:21 AM   #3
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I found this info, hope it helps . . . keep us posted as to what you decide and how it works out.

I'll probably be considering this in the spring.

On The Wings of Goodyear | RV Tires - Related Info - Size Conversion
1991 32' Winnebago Itasca
bought used in 2009 - our first
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Old 11-19-2010, 01:09 PM   #4
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An 8R rim is not wide enough to put the 245's on. The 245's require 6.75" rims and the 8R's are 6". I replaced mine with bridgestone 187's. They ride wonderfully and are available everywhere. A set of six mounted, balanced, and tax was just under $1700.00 but well worth it.
1995 31' Itasca Surise
1987 suzuki samurai toad
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