Probably don't have to tell you but remember belt driving at 2.5:1 will increase your resolution but will reduce your max feed rates.

My machine uses 3Nm steppers and I am driving them at 36V 5A, absolute maximum feed I can get without losing steps is 7500mm/min but have reduced it to 5,000mm/min so that I am not pushing it to the limit all the time and this is driving the screws direct without any belt reduction.

So 5,000mm/min divided by 2.5 will only give you 2,000. Does depend on voltage's, driver type etc but I would say that 2,000mm/min may not be enough.