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@hippy
Sorry Tommy I used 27 in my calcs all the time.. why? Coz I'm lazy and 27 is easier to remember than something else.. :P
It's not exact anyway and if you are just working out how much difference new gearing will make there's nothing wrong with using 27.
I'm gonna keep using 27.. 27.. 27... 27..... 27......... 27.
It's only a rough guide anyway, it's not like anyone here is going for a world record pursuit time or something where shit like this makes a difference.