Originally Posted by
rbart4506
28 gives you a higher gear that makes it easier to spin going up hill.
That's a lower gear, not higher. 39x25 is a 1.56:1 gear ratio (rear wheel turns 1.56 times for every crank revolution). 39x28 is 1.39:1. 1.39 is lower than 1.56, hence it is a lower gear ratio.