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Re: Re: Re: speed diff from 18.4 38 to 18.4 42
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Posted by big fred on May 01, 2004 at 20:06:37 from (65.219.141.162):
In Reply to: Re: Re: speed diff from 18.4 38 to 18.4 42 posted by Bob on May 01, 2004 at 19:44:09:
Bob, it doesn't really matter if you use circumference or diameter, unless you want to know how many revolutions a tire makes in a given distance. The speed increase will be in direct proportion to the ratio of the new diameter and old diameter. I don't know right off what the diameter of a 38 and 42 tire are, but I'd suspect you will end up with the speed being about 10% greater than indicated.
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