Going to start having my son doing some indoor riding. What do you guys do for equipment? He has a rim drive trainer we put his race bike on but doesnt like the feel or the resistance..ive seen his cadence and it gets choppy. Is it the trainer or him? Was thinking of getting him some kind of stationary bike but want to be able to configure it like his race bike, mainly crank length. Is this possible or even nessesary?