Joined: Jan 2010
Posts: 9,815
Likes: 1,790
From: Northern California
Bikes: Cheltenham-Pedersen racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
A strange coincidence today, after I and others posted about your using the MT62 derailer, I actually fitted a customer's bike with a larger 8s cassette and one of those old, heavy, silver SIS Deore long-cage rear derailers.
Guess what, the thing indexed the whole cassette, seeming quite well, using the bike's original 8s 105 DT levers.
EDIT: I just checked again, and the derailer is a Deore DX model RD-M650, which looks just like a later version of the MT62. So quite possibly this one was actually designed to be 8s compatible, since the DX gruppo was offered well into at least the early 90's.
Also remembering that the 8s versions of 105, 600 and Dura-Ace derailers looked quite like their predecessors, which were not 8s compatible.
Last edited by dddd; 10-16-15 at 10:33 PM.