7-Speed Freewheels

7-speed freewheels appear on many entry-level mountainbikes. The freewheel includes the ratchet mechanism, and the complete unit screws onto the wheel. If your ratchet mechanism is attached to the hub, you'll need a cassette rather than a freewheel.

Shimano 7-Speed Freewheel 13-28

2618
!
7 speed screw on freewheel. Sprocket sizes: 13, 15, 17, 19, 21, 24, 28.

For removal from wheel use Shimano TL-FW30. Weight: 456g.

Shimano MF-TZ31 7-Speed Freewheel 14-34

2619
!
46 grams lighter than the MF-TZ37. Sprocket Sizes: 14, 16, 18, 20, 22, 24, 34.
 Weight: 484g.