Not a professoinal but the 80 and 85 refer to the profile of the tire sidewall stated as a % of the tread width.The 235 is the tread width in mm. The sidewall of the tire is 80% of that number. The Goodyear tire is 5% taller than the Mission making for a slightly larger diameter. This whould not be a problem unless your axels are extremely close set. Bob
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