Originally Posted by dsbrantjr

"give my new bike a little more speed" As Bill K mentions, the gearing may or may not be higher on your old bike, it is the product of both the front chain ring size and the rear cogs.

Higher gearing does not equate to "more speed" unless you have the power to accomplish this. Having a bike which is geared unnecessarily high can be hard on your knees. Unless you are "spinning out" in the highest gears of your new bike you likely won't be able to go any faster with bigger gears.

Learning to spin faster will cause less wear and tear on your legs and be better for your cardiovascular fitness.