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Would be interested to hear what type of threading is on yours! Thanks in advance!
@gaston is there some way of findig out whether the hub is french threaded? Judging by the fact that a plated cheapo generic cog went on fine, I think the problem is with the EAI cog and the threads are actually ita or british.
Sig_Arlecchino-
Well, I tried with these two cogs and they went in nicely:
Then I tried with another eai cog I have (3/32) and it's the same problem, it wont engage after a few threads.. I don't have a recent hub to thread it onto.
I think you have a BSC threaded hub as mine and you're stuck with older cogs unless you force newer cogs onto it, turning it into ISO..
ps: another way of getting around the ratio issue would be trying smaller chainrings on your 631 or getting a 632 which has smaller spider arms.. ;)
agusteed
I've heard before that eai cogs have a "tight" fit and I've personally had some issues with one of their deluxe cogs before on some vintage campagnolo record hubs, which were iso as well.. so ended up selling it with an on one hub that fitted nicely.
You shouldn't need elbow grease, it's a bit like headset threads: you can put an iso headset on ita threaded forks and vice-versa but back and forth is strongly advised against.
Now I'm a bit curious, I'll check on my 520 hubs what kind of cog threads on..