Gear case

A gear case, also known as a chain case or chainguard, is an enclosure for the bicycle chain and sprocket assemblages commonly employed by utility bicycles. It serves to protect the cyclist from being soiled or trapped in the chain rings and tends to fully enclose the drive train. It may also contain an oil bath to keep the chain lubricated. Modern examples are usually moulded in plastic. Similar devices may be found in connection with chains used on larger vehicles and machinery.


  • Fully enclosed chain on a European city bike
  • Partially enclosed chain on a European city bike
  • Huffy Flaming Stack chain guard
  • BMX bike with a chain guard bolted to the frame
  • Crankset with an integrated chainguard bolted to the outside of the largest chainring
gollark: Even if it's technically possible to replace the parts - I don't really know the practicality of (un)soldering such things - it is much harder than with sane laptops which SATA ports.
gollark: So no ability to swap those.
gollark: The RAM and storage are soldered in in Apple laptops, no?
gollark: My old laptop had a 45W CPU and could keep hot chocolate pleasantly warm.
gollark: The M1 is quite neat, but it's also not very good that it's ridiculously integrated and impossible to upgrade/repair, as well as enforcing running only Apple software.

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