Like I said in the first post this bike was a complete basket case. I mean it was together and people had ran it but it went through too many cobbling hands... Just get it going good enough to get the kids out of my hair... I believe it has a 12 tooth going to a 13 tooth driving a 9 to driving a 40 tooth LOL... I've got an 18 tooth and some chain ready to replace the 13 tooth hopefully Tuesday according to Amazon...