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Old 09-15-2015, 07:27 AM   #1
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19.5 tire options

It is time for some new tires on my RV and I am looking for options. I own a 1994 Fleetwood with the P30 chassis with 8R 19.5 tires. I have done some research and found information that the 225 70 19.5 is an excellent replacement option. Has anyone here replaced their 8R 19.5 tires with the newer 225 70 19.5 tires? If you made this change how do you like them, did it change anything?
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Old 09-15-2015, 07:58 AM   #2
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My brother in law just put 8r on his 94 bounder. I just put 245/70 19.5 on my 05 bounder.
The 245 tires are much more square and put a lot more rubber to the ground, the 8r were much more rounded and so they had less rubber touching thee ground.
The 8r Big O Brand were about 1/2 the cost of my Sumitomo 245's.
Sorry, don't have actual driving experience comparing them on the same rig.
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Old 09-15-2015, 08:45 AM   #3
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I replaced the 8r's on my 96 Itasca Suncruiser with the 225r-19.5 about 4 years ago and I really like them. The only thing is my speedometer is about 4 mph fast because the 225's are just a little bit smaller. I couldn't go with the 245's as they were wider and I didn't want the rear dual tires to touch.
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Old 09-15-2015, 09:59 AM   #4
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I have changed two different motorhomes of mine from the 8R19.5 to the 225R19.5. The 225 is made for motorhomes. It has better UV protection and is designed for a better ride. The tread is also wider. Go with the 225 and you will never regret it.
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Old 09-15-2015, 05:48 PM   #5
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I did this 4 years ago. With my 3 speed transmission there was a noticeable increase in RPM and noise. I lost 5 MPH ( when I was doing 55 with the 8R's it was actually 60.) the 225's set the speedometer right on. So now when I'm doing 55 I'm doing 55. I have never felt the handling was any better but the ride seems to have improved. Would I make the change again.. probably not. Also the Hankooks that I bought were considerable heavier.
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Old 09-15-2015, 08:08 PM   #6
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These post have been very helpful!
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Old 09-18-2015, 04:44 PM   #7
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I have stayed with the 8R-19.5 because I prefer the larger diameter which is 34" vs the 32" dia. of the 225/70
At every 600 revolutions the 8R will be 315 ft further ahead of the 225/70 tires at the same 600 revs. 600 revs is a little over a mile for the 8R-19.5 tire. The '93 Bounder came with 8R-19.5 tires from the factory and I see no advantage going with a smaller dia. tire.
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Old 09-20-2015, 09:30 PM   #8
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I noted this "ehow" writeup in another post on this forum. It explains a lot, including the different rim sizes you may encounter.

Read it here The Effects of Changing From 8R19.5 to 225/70 19.5 Tires | eHow

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