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Old 01-26-2018, 08:20 AM   #1
Winnebago Owner
Join Date: Nov 2017
Location: Louisville Ky
Posts: 52
Tire Question for 2002 Journey DL

I have Michelin 235/80R 22.5 tires that have date codes of 2011 and showing signs of cracking on the sidewalls. I priced new Michelins but price was $450.00 per tire not using the FMCA discount. I also price Continental 255/70R 22.5's at $350.00. Is there an issue using the Conti size vs the Michelin size. I only have these two truck tire dealers to work with here.
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Old 01-26-2018, 12:03 PM   #2
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Join Date: Jun 2008
Posts: 59
The Continental's are ~0.8" smaller in diameter. The smaller diameter will introduce a small speedo error, in this case about 2% (1.2mph @ 60mph). Make sure the Continental's have the same or higher load rating as the Michelin's. Also need to consider the Continental's are about 3/4" wider.

Tire diameter calculation: (235/80R 22.5)
What the numbers mean: 1st number is tire width in millimeters, 2nd number is aspect ratio of tire height to width (percentage), 3rd number is wheel diameter.
Sidewall width divided by 25.4 (convert millimeters to inches)
Tire height = Sidewall width multiplied by aspect ratio (80 = 80% or 0.8, 70 = 70% or 0.7)
Tire diameter = tire height times 2 plus wheel diameter (TH * 2 + 22.5).
Tire circumference = diameter * pi (3.142)
Revolutions per mile:
Convert tire circumference to feet by dividing by 12
Divide 5280' (number of feet in a mile) by tire circumference

Good luck with your decision,
Albert Irusta
2011 Itasca Meridian 34Y
2006 Jeep Liberty
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Old 01-26-2018, 01:42 PM   #3
Winnebago Owner
Join Date: Nov 2017
Location: Louisville Ky
Posts: 52
Thank you for the reply. Tuff decision. I don't mind paying more if the Michelin's are worth the price, but from what I'm reading, the sidewalls dry rot fast.
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