i have been running my 415ms for over a year now and have only changed the belts once! parts that break...well if you tap a board at speed, you will probably bust a c-hub, steering knuckle, or front a arm. i have gone through many since i run on a tight indoor asphalt high grip track. i run a 5.5 gear ratio with a 23turn stock motor. (thats all they race over here in japan)
have fun with your new kit!