22.5 vs 19.5 tires
Help me out here. Our three previous coaches have had the 19.5. We are thinking of trading out of our current 2016 Winne Sunstar. We loved our 08' Sightseer 35J and that had 19.5 tires. We are l...
Forum Discussion
dubdub07 wrote:
Tire size is dictated by the tires size, not the rim size. A 275 is the same height regardless of rim size. A 19.5 will usually have a 245 tire and a 22.5 uses a 275. That is your difference in height. I can't see much of a difference other than your gearing is affected negatively with more diameter.
Will
Tire size specifications do not directly measuring outside diameter, nor sidewall height, though both are defined by it. A 275/80 R22.5 tire has a tread width of 275mm, an aspect ratio of 80% (the ratio of the width to the sidewall height), and an inside diameter of 22.5 inches. The overall diameter would be 22.5 inches plus twice 80% of 275mm, which works out to 39.8 inches once all the unit conversions are done. A 245/75 R19.5 would have an overall diameter of 34 inches, for comparison sake, about a 15% difference.
Tire sizes are rather strange in that they combine a metric measurement, a unitless ratio, and an imperial measure.
