Shimano, Multiple Freewheel Sprocket, Mf-Tz510 14-28T, 7-Speed, 14-16-18-20-22-24-28T, W/Spoke Protector

This Shimano Tourney multiple freewheel gives budget and entry-level bikes reliable, low-maintenance shifting across a wide gear range. Built in a 14-28T, 7-speed configuration, it includes a low first gear for easier climbing and a spoke protector to guard against derailleur damage. It's a straightforward drop-in upgrade or replacement for compatible freewheel-equipped hubs.