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Old 10-07-2014, 06:11 PM   #1
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Switching Tire size.

Has anyone switched from the standard 275/70/22.5 tires to 255/70/22.5 tires. I have been told that the 255's are a better tire and cost less. I know they are a little narrower but not by that much. Just fishing for info. Jim
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Old 10-07-2014, 06:15 PM   #2
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I don't know about that but will suggest you look at the number of revolutions per mile when buying tires. Kind of messes with your speedometer and odometer if those differ a bit.
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Old 10-07-2014, 06:35 PM   #3
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Hi rvjimmy,
For me, this is not a good idea. Going to the 255 tires reduces the load capability by:
1. Single 1430 lbs per tire
2. Dual 1325 lbs per tire
Go to http://www.michelinrvtires.com/miche...ion-tables.jsp
and check it out.
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Old 10-07-2014, 07:46 PM   #4
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I went the reverse direction than u want to . I have not blown a tire since I did this 8 yrs ago.
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Old 10-07-2014, 07:50 PM   #5
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No. It will reduce your load capacity.
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Old 10-07-2014, 08:49 PM   #6
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I'm going from 255.70.22.5 to 295.75.22.5. This will permit me to lowering Psi from 115 to 95-100 which will result in a softer ride reducing the harshness when hitting pot holes, bridge connections and overall roads that are in bad repair

Hurk
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Old 10-07-2014, 08:55 PM   #7
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Changing tire size will alter many things on your coach. If you go down it will increase the rpm to maintain speed, your speedometer will be incorrect and your loading capability will be reduced.

If you go up in size you will reduce the rpm to maintain speed, your speedometer will be incorrect and your loading capacity will be increased. Along with the lower rpm you will increase the amount of torque required to propel your rig. Most likely will not hurt anything buy the extra strain may have long term negative effects on your drive train.
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Old 10-07-2014, 09:17 PM   #8
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Load capacity does change, speedometer can be corrected by accessing the ECM. (At 65mph indicated you will be doing 63mph without correcting) Chart here will show the actual differences.
http://www.tacomaworld.com/forum/tir....5-255-70r22.5

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Old 10-07-2014, 09:42 PM   #9
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Quote:
Originally Posted by Hurk View Post
I'm going from 255.70.22.5 to 295.75.22.5. This will permit me to lowering Psi from 115 to 95-100 which will result in a softer ride reducing the harshness when hitting pot holes, bridge connections and overall roads that are in bad repair

Hurk
I assume you have confirmed that your wheels are correct for the larger size and that you will have the clearance needed on the front. Also that the rear dual tires will have adequate separation. That is quite a big jump in tire size. I went from 255/80. 22.5 up up 275/80. 22.5 on a previous coach and they just barely fit. No way could I have gone to 295's
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Old 10-07-2014, 09:51 PM   #10
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I went to 305/70's on the front and kept the 275/70's on the rear. To do that I had to go up to 8.25" wide rims, that LOWERED the rear tire capacity but not enough to change anything.
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Old 10-08-2014, 06:27 AM   #11
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It will change the load cap. so as long as your new tires will not be overloaded then no issues. You will need to weigh your coach on a truck scale and look at the front and rear lbs to really determine you will not be overloading the tires.

It will not change or cause issues with the speedo because you are not changing the size on your side profile or rim size.
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Old 10-11-2014, 07:44 AM   #12
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I ordered 6 new Firestone's today, 275/70/22.5. Should get them next week, told them to get the dates for this month, don't want any old tires. He said he had 12 of them but would order 6 for me with the dates I wanted. 350.00 dollars apiece from my tire dealer at work. Jim
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