You could install a larger big ring up front to correct the gearing, but bear in mind that the front der. can only handle a certain size difference between the largest and smallest ring. Some cheaper cranksets have the rings rivetted to the crank spider; in that case you will have to replace the whole crankset if you want taller gears. If you're mostly chasing the kids around on this bike, you may be OK with the gearset as it is.
Last edited by rnorris; 07-31-09 at 07:41 PM.