Mavic 840 NOS/NIB Classic Rear Mech

✓ Original part - produced in the 1990s
✓ New old stock! Still in it's original packaging!
✓ Made in France
✓ Worldwide shipping

Mavic 840 rear mech, in production during the 1990s (yet still new & unused after all this time!). Made from aluminium and weighing in at 233 grams - pretty lightweight for a rear mech of this time. A fine choice for keeping your classic bike authentic, but also great for any other compatible bike too.



Body Condition - New Old Stock - In Original Packaging*
Jockey Wheel Condition - New Old Stock*
Production Era - 1990s
Country - French
Material - Aluminium
Weight - 233 grams
Stock Code- D-RM17C

*New old stock items may have marks from storage over the years, and as we often have multiples they can vary from piece to piece, but they are always genuine new & unused items.


Shifting System - Mavic, Dura-Ace SIS, Dura-Ace STI, Friction
Speed* - 8 Speed
Max Sprocket Size - 26 Teeth
Max Chain Wrap - 26
Chain Width - 3/32"

*See help section.


We've been safely sending orders around the world since 2010. There's a handy shipping calculator on the shopping cart page so you can see the cost of postage as soon as you've added it to your basket. Your order will be carefully packed and sent with tracking & insurance, we despatch most orders within 2-3 working days but larger items can often take a little longer to process.

We accept returns, please notify us within 14 days and ensure the item arrives back with us no later than 30 days after the order was received.

We don't charge VAT, however, if buying from outside of the EU please remember that there may be import duties to pay upon receipt.



Shifting system - friction means your gear levers don't click when you change gear, when they do click it's referred to as indexed shifting. If you have indexed gear levers they must use the same system as the rear derailleur, if you're using friction levers you can mix and match.

*Speed - the number of cogs at the back the derailleur was designed to be used with. This is important with indexed shifting, but with friction shifters you can in theory run any rear mech with any number of cogs, but you are more likely to have issues running high numbers of cogs with mechs from earlier eras.

Max cog size - the amount of teeth on the largest cog of your freewheel/cassette can be no greater than this to work with this derailleur.

Chain wrap - subtract the size of your smallest rear cog from your biggest, then do the same with your chainrings, add the 2 numbers together and you have your chain wrap.

Chain width - generally speaking, derailleurs designed for more than 3 speed use will fit a standard 3/32'' chain, the exception being some Cyclo & Simplex models from around the mid 1900s.