cannondale m300

Yo man 1st with 1" headsets there are actualy several types and you need to determin which one you need for your aplication there are major differences not all 1" sets are compatable with all 1" applications unlike 1 1/8 with them you basicly mix and match 2nd as far as replacing the drive train you are lookin at expense there you will need to determine the gearing you will need is there alot of hills where she'll be riding??? then you need low gears ie a 30/11 or 32 /11 as far as cranks stick with something that has replaceable steel rings as aluminum may be lighter but wears out quick!!!! so go with something like the M 410 alivio decent crank and the rings will last bloody forever ohh and stick with kmc chains!!! they are cheaper and better than all the others in the same class shimano makes great cranks but there chains are over priced and break easily have fun on the build and enjoy nthe ride remember..... engines are for wimps!! real men and women peddel!!!!!!!!!