the secondary sprocket takes up a little room so you will loose a few pedal gears , but you wont need the big ones , just make sure your rear bundle threads on , then get a new gear bundle with fewer gears to make up for the room you will need , you might have to stretch the bike frame just aliitle and ad another spacer nut on the axle , you will need a scooter freewheel with the four bolt pattern about ten bucks , and a bearing cup for a bottom bracket , the threads are all the same , you will see , play with it , it works , i like the 8mm chain but you can use other sizes but you will find that drive sprockets and large chain rings come in tons of sizes in the 8mm . if you go half inch bike chain your choices will be limited