The curcmference of a 4" wheel in MM is 319.2, diveded by 6mm gives 53.2 equal divisions, on a 5" wheel dived into the same number divisions they would be 7.5mm wide. Simples!
Which also confirms that dividing by 4 and multiplying by 5 to arive at the same answer is another method of calculating it.
HFT, for people with only 2 buttucks!
VooDoo TwoTwo The next chapter.
Last edited by Tench; 16th September 2013 at 05:46 PM.