The Mavic looks like other mechs from that era: Campag, Simplex , Huret, Zues and others. The body moves in and out only. I think it was the Japanese, either Suntour or Shimano who developed the modern derailleur where the body, now sitting more horizontal than vertical moves down and back as well as in and out.
This might do the trick:
I’m using one on a modern steel frame. The clamp is substantial enough not to need the anti-slip pip and it fits a modern steel tube set with larger down tube diameter. Reynolds 853 in my case.
No problem. 39T gives you a range of 29-95 inches.
Depends on the make and model of your mech. It will have a total tooth capacity which is front rings range plus rear cassette range. In your case, it’s 0 + 25 = 25 teeth.
The chain ring size depends on the gear ratios you want. In your case it’s 30-98 inches which is ok for most riding.
Or you can get a longer brake nut. Either way, it won’t look pretty as recessed rear brake bolts only just protrude beyond the hole in the brake bridge.
It looks identical to a chuck I bought from Topeak so maybe they have spare gaskets.
Thanks. I've sent you an email to the address you gave me in the PM so hopefully that will sort it,
Genuine parts from the 70's. All prices include postage.
Shimano Dura Ace derailleurs; front mech, rear mech, downtube shifters, downtube cable guide and derailleur hanger £30 SOLD
Weinmann side pull brake calipers £20 SOLD
Tange Allez headset £15
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