The MF-TZ510 freewheel sprocket from Shimano with weight-optimized construction for the Tourney TZ 3 x 7-speed group.
The new TOURNEY components cover the 3x7-speed and 3x6-speed segments and feature new REVOSHIFT shift levers, new freewheel sprockets with greater corrosion resistance and new rear derailleurs with a sportier look, SIS index shift function and solid shifting performance that cover a wide gear range from 12-28/32 to 14-28/34 teeth.