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@exedanni
Cheers, I have revised my requirements and I am going to go for 42/15, which gives 74.9". 15t EAI sprocket ordered :-)
One further question, according to the Rabbit singlespeed calculator, tire width seems to have an effect on gear inches, i.e. 700x28c is 74.9" and 700x25c is 73.9" for the ratio of 42/15. I can see how tire diameter would have an effect, but not the width?