Cattledog,
Thank you for that input, it makes absolute sense. I am not entirely sure how to implement your suggestion so it appears I need to do some learning about floating variables and how to correctly implement them.
I came to .157 using the following... My pulley has a circumference of 3.1385" if my encoder is 20PPR then I need to divide 3.1385 by 20 which gives me .157 per pulse.