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Old 03-04-2014, 09:18 PM   #1
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Another tire question

I have a 97 dutch star dsdp3758. It has 275-80-22.5 Michelin's on it now. The date code is 05. Still in really good shape, no dry rot. But I am replacing because of age. I see a lot of people going with the 295-75. They measure almost the same as what I have. I am looking at the firestone and toyo's. One dealer told me the 265-75 toyo's are what I want as far the size. But I looked them up and the diameter is 2" less than my tires. Just want to know some thoughts on this. By the way I just bought this coach about a month ago. I mainly use it to pull my race car locally. But will be making a few long trips. And I want to keep the family safe on the road. I also got a pretty good price on some Hercules tires. Any help is greatly appreciated. Thanks
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Old 03-04-2014, 09:52 PM   #2
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Oj, this is just my humble opinion, but I changed the rear tires on my Discovery, with the size that was on it, 245-75-22.5's. I didn't want to change the ratio, because it was doing very well, fuel mileage wise, and pulling power. Have you checked the size on the front? My tires are a different size on the front. I don't imagine it was built that way, but TOYO's don't make a 255-75-22.5, so I am going to put 265's on.
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Old 03-05-2014, 12:26 AM   #3
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I am pleased with the Firestone FS560 tires I purchased 5 months ago. This calculator may help you with decisions about sizes.

Tire Size Calculator - Compare Tire Sizes
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Old 03-05-2014, 01:35 AM   #4
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I would think that a smaller tire would be of benefit at low end speed and towing but not so good for highway driving. According to the chart provided by gruelens, it would take a speedo reading of 65 to get to an actual speed of 60 mph. That seems significant to me over longer highway drives. Might also save you a speeding ticket too depending on how you drive.
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Old 03-05-2014, 06:31 AM   #5
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The tire is 1/10 of an inch bigger. Not any major difference except more common.
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Old 03-05-2014, 06:39 AM   #6
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Quote:
Originally Posted by Ojpearce05 View Post
I have a 97 dutch star dsdp3758. It has 275-80-22.5 Michelin's on it now. The date code is 05. Still in really good shape, no dry rot. But I am replacing because of age. I see a lot of people going with the 295-75. They measure almost the same as what I have. I am looking at the firestone and toyo's. One dealer told me the 265-75 toyo's are what I want as far the size. But I looked them up and the diameter is 2" less than my tires. Just want to know some thoughts on this. By the way I just bought this coach about a month ago. I mainly use it to pull my race car locally. But will be making a few long trips. And I want to keep the family safe on the road. I also got a pretty good price on some Hercules tires. Any help is greatly appreciated. Thanks
Are the 295-80s the tire size posted on the chassis placard OR merely the size currently on the coach... not necessarily the same thing. I would not change the tire diameter, but I might go to a 295-75, which should be about the same diameter, as long as you had sufficient clearance. You must have adequate space(at least 1" not sure) between the dualies, as they will compress while driving and the sidewalls could wear each other. And all this is dependent upon the width of your rims, and what tires can be accommodated on that width rim. Keep researching.
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Old 03-05-2014, 06:59 AM   #7
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2001 DSDP and just re-shoed with 295-75-22.5 Bridgestone R280. Very common tire, matched the original 275-80 in diameter, fit on the duels and very smooth ride. I was lucky and found (6) new takeoffs from a local Pomps Tire - excellent price. --Tom
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Old 03-05-2014, 07:56 AM   #8
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Quote:
Originally Posted by GreaTOne65 View Post
Oj, this is just my humble opinion, but I changed the rear tires on my Discovery, with the size that was on it, 245-75-22.5's. I didn't want to change the ratio, because it was doing very well, fuel mileage wise, and pulling power. Have you checked the size on the front? My tires are a different size on the front. I don't imagine it was built that way, but TOYO's don't make a 255-75-22.5, so I am going to put 265's on.
The OEM tires for your MH. Was 235/80/22.5
265's will be around 2" larger then the 235/80 or 245/75
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Old 03-05-2014, 12:03 PM   #9
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Not sure what come on it, haven't found the sticker yet with that on it. It has. 265-80's on it now
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Old 03-05-2014, 03:44 PM   #10
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I am sorry, it has 275-80's on it now. I found the sticker and it shows the motor home come with 245-75's. Would it be good choice to go back to original size or stay bigger?
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Old 03-05-2014, 05:35 PM   #11
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Original size is best. Gearing, speedometer, etc. all calibrated to original size. for you that would be 245-75 or 235-80 for Michelins.
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Old 03-05-2014, 07:45 PM   #12
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This is an a great time to load your coach for travel and get individual wheel weights before buying new tires. If you have one tire position running right at the max weight limit (or over the weight limit), you have the option of going up in load range to get a little more safety factor.

For example, my coach is heavier on the driver side front, and the original owner had several blowouts on that position. When I weighed the coach, I found that the original tires were running right at the max weight allowed for that tire. I now have different tire size and load range, and no blowouts so far.

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Old 03-05-2014, 08:07 PM   #13
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I am going racing this weekend, and there is a truck stop on the way. I think I am gonna pull in and put it on the scales. Now that I see it came with 245-75's, am looking at the 255-75 firestone fs560's. I think the toyo's had that size too.
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Old 03-05-2014, 09:04 PM   #14
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Being a racer you know all about footprint and traction/weight per sq inch of footprint, only in this instance you are concerned with braking traction instead of power traction. This is why I never try to out-engineer the design engineers for my vehicle, and stay with OEM tire size.
BTW, the recommended distance between duals sidewalls is 1.5".
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