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Tire Radius:
7.50X20 = 17.0 8X22.5 = 17.1
8.25X20 = 17.6 9X22.5 = 17.9
9.00X20 = 18.6 10X22.5 = 18.6
10.00X20 = 19.2 11X22.5 = 19.2
11.00X20 = 19.7 12X22.5 = 19.7
12.00X20 = 20.4
Tire Revolutins per mile:
7.50X20 = 568 8X22.5 = 563
8.25X20 = 549 9X22.5 = 543
9.00X20 = 520 10X22.5 = 529
10.00X20 = 504 11X22.5 = 501
11.00X20 = 487 12X22.5 = 487
12.00X20 = 470
Of course, these are generalizations/averages. Different manufacturers will make things differently so to make sure of your calculations you will need to measure your own tires.
As you can see on the chart, going from a 11.00X20 to a 12X22.5 is not a calculable difference.
I would agree the gentleman didn't experience a change by going to tubeless tires. If the gentleman had gone to a 12X24.5 he would have seen the same difference had he gone from a 9.00X20 to a 11X22.5 or a 10.00X20.
Changing the number of rotations a tire makes in a mile by 15 or 20 RPM's can make a significant difference.
Good luck and happy trails.
Mark O.
So, moving a bit off topic, does moving from a tube type tire to a tubeless improve the ride?
John the Busboy |
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