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Mavic rear derailleurs

On this page: 840 short cage | 801 (last version)

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What is now Mavic was started in the late 19th century as a maker of bicycle components. But it was in 1934 that Mavic hit its stride when they began making aluminum bicycle rims. The Tour de France initially forbade their use, Tour boss Henri Desgrange feeling that they were unsafe compared to wooden rims. Antonin Magne won his second Tour in 1934 using Mavic rims that were painted to look like ones of wood.

Mavic introduced their own component groupset in 1979. The rear derailleurs were beautifully well-made and had an interesting difference. All the derailleur pivot pins were held in place with removable circlips. The derailleurs could be completely disassembled, cleaned and rebuilt. Broken or worn parts, even of the parallelogram, could be replaced.


Mavic 840 rear derailleur. New, taken from new bicycle, $275.00

Often a customer wants a component change on a bike; wider range gears, etc. That happened here. It's a new derailleur that came as original equipment on a bike.

  • 840 rear derailleurs are aluminum, titanium and steel.
  • They are compatible with Mavic and Shimano SIS & STI systems
  • 840 short cage rear derailleurs will throw a 26-tooth cog.
  • Produced starting about 1992
  • Probably made in the Simplex factory, which Mavic pruchased in 1989.

Mavic 840 rear derailleur

As with all Mavic products, this rear derailleur is nicely finished.

Mavic 840

From the back.

Mavic rear derailleur

Another view. On the lower right the removable circlips can be seen


Mavic 801 (last version) rear derailleur. Used, $100.00

  • Missing top pivot bolt
  • Produced in the late 1980s.
  • Maximum cog size can be 32, but it works best if it isn't pushed beyond 26.
  • The pulley cage is mounted to the parallelogram on a slotted outer plate. This allows the mechanic to optimize the pulley distance from the freewheel. With the right dropout and with the cage pulley fully dropped, it will throw a 32. It won't be pretty, but it's great if you need mount some low gears right now and don't want to hunt up another derailleur and shifters. You can see the slot on the pulley cage in the bottom photo.

Mavic 801

Completely rebuildable

Mavic 801

From the back. The Mavic pulleys have been replaced with wheels made by Shimano.

Mavic 801

And another view