drive combinations, whats best.

[overson]

Hi im looking to use an over all ratio of 4.9 but i am not sure on what combination of spur and pinion.
does any know whats best a large pinion and small spur or a smaller pinion and a larger spur.
the choices i have are.
84 spur and 29 pinion.
81 spur and 28 pinion.
78 spur and 27 pinion.
75 spur and 26 pinion.
thanks Neil.