Shimano Tourney MF-TZ510-7 7Sp Multiple Freewheel 28T Silver/BlackThe Shimano Tourney MF-TZ510-7 7Sp Multiple Freewheel is a great replacement when your previous multiple freewheel is worn out. There are two sets of tooth configurations to choose from. You can have either 14-16-18-20-22-24-28T, or 14-16-18-20-22-24-34T.192790617671