The 235 and 255 are close, diameter 235 is 37.1 inch, 255 is 36.7 Speedometer error at 60 is 1.1 mph. Dual wheel spacing the 235/80 needs 10.3 inches the 255/70, 11.6inches (check your rim offset)
Tire calculator here: https://tiresize.com/calculator/
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U.S. Coast Guard retired- 1956-1985
Pensacola, Florida
2016 Siesta 24ST
1972 Moto Guzzi Eldorado
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