Shimano MF-HG37 7-Speed Tourney Freewheel
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For those still using a drivetrain equipped with a 7-speed freewheel on the rear wheel, the Shimano HG37 Tourney Freewheel makes an ideal replacement. Its steel construction ensures strength and durability and the spacing between the cogs are designed for use with Shimano 7-speed indexed shift levers. And note, this is a freewheel design with the cogs and ratcheting mechanism contained in a single unit that threads onto the hub, not the current cassette design in which the ratcheting mechanism is part of the rear hub and cassette cogs simply slide onto the freehub body and are secured by a lockring.