Hyperglide (HG) series 7-speed compatible chain, recommended for Altus and older Alivio / STX drivetrains.
Shimano HG40 Chain 7 Speed Features:
HG technology has chamfered inner plates to optimise shifting performance on HG sprockets
Comes with quick and easy to use connecting link
Durability is assured through the heat treatment of rollers, pins, and plates
Mushrooming of the pins gives unsurpassed side-plate retention, enabling the chain to far exceed the BS/ISO standard for breaking force
7.3 mm chain width, optimised for 7- and 8-speed HG drivetrains