Originally Posted by cmdr
Looking for parts for Vitus build.
Mavic 7 speed freewheel English or Italian thread (don't even know if this exists)
Nope, they don't. There was the cassette hub (571) which had a proprietary spline system, but was Shimano spacing.
If you're looking to use 821 shifters with an 840 rear, any evenly spaced freewheel should work. With the little cable routing thingy in the up position, its cable pull is identical to modern Shimano derailleurs (any SIS derailleur, except the pre-97 Dura Ace's). The Shimano 7 speed freewheels (including Dura Ace) work great, if you can find them.
If you want the Mavic tech notes on the 821 + 840, let me know and I'll scan them.