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Topic: Optional tire size (Read 549 times) previous topic - next topic

Optional tire size

Have 1998 U270 series.  Due optional tires sizes impact steering? Original size was 275/80R 22.5. What I have now is 295/75R 22.5.

Re: Optional tire size

Reply #1 –
No, a little wider but the same diameter. Note the aspect ratio from a 80 to 75 so that offsets the 275 to 295. The difference is one revolution per mile on paper but the the real world, manufacturers very slightly between each other and even between tires of their own brand.

Pierce
Pierce and Gaylie Stewart
'93 U300/36 WTBI
Detroit 6V-92TA Jake
1140 watts on the roof
SBFD (ret)

Re: Optional tire size

Reply #2 –
Some owners experience rubbing on the air bag lower support, usually without serious problems.
Regards,
Brett

'99 42' Foretravel Xtreme
'14 Brown Motorsports Stacker
'05 Chevy SSR
'02 BMW R1150R

Re: Optional tire size

Reply #3 –
Quote from: amos.harrison –
Some owners experience rubbing on the air bag lower support, usually without serious problems.
While I have had the metal end of the air bag occasionally touched and slightly polished, I don't ever recall any problems, minor or serious. Your "usually" would indicate otherwise and add and element of doubt to the mounting of 295/75R22.5 instead of 275/80R22.5.

Pierce
Pierce and Gaylie Stewart
'93 U300/36 WTBI
Detroit 6V-92TA Jake
1140 watts on the roof
SBFD (ret)

Re: Optional tire size

Reply #4 –
I looked at the dimensions on this tire comparator and on the with is only 0.8  wider and you have to divide that so in reality it is 0.4. If you are polishing the airbag bracket  you might look and see if you have steering stops you can adjust. I think you might find more variance between tires in a batch.
Tire Size Comparison
Bill
2008 Newmar Mountain Aire (4523)
Cummins ISM 450HP
Allison 4000 MH tran.
Towing a 2014 Honda CRV with a blue Ox tow bar
A man who carries a cat by the tail learns something he can learn in no other way.
-Mark Twain-
 

Re: Optional tire size

Reply #5 –
Quote from: WILDEBILL308 –
I looked at the dimensions on this tire comparator and on the with is only 0.8  wider and you have to divide that so in reality it is 0.4. If you are polishing the airbag bracket  you might look and see if you have steering stops you can adjust. I think you might find more variance between tires in a batch.
Tire Size Comparison
Bill
Bill,

The polishing only occurs at unusual attitudes and not in a normal turn. Ours seems to touch with the coach leaned over a little like in tight turns in campgrounds. Never a trace of noise or vibration. I was checking tire diameters/revolutions per mile and different models of the tire within the same manufacturer are different. H load ratings seem to be slightly larger plus air pressure will cause the tire to grow as the pressure is increased.

Pierce
Pierce and Gaylie Stewart
'93 U300/36 WTBI
Detroit 6V-92TA Jake
1140 watts on the roof
SBFD (ret)