I dont think its a whole number. One side is 5092 the other is 4244 steps per inch. The one pinion has a pitch dia.of 1.25 the other is 1.5 , then it goes thru a 25:1 belt reduction. Then 1000 count encoder in quadrature to make 4000 count per rev. ,then a x5 step multiplier on the gecko servo drive. lol Making my brain hurt just thinkin about it, Im guessing maybe ill have a order for mcmaster carr for another rack in my near future.