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Wow, thanks a lot for your efforts, that is really helpful. I'll keep looking for a matching cog and see if I can use the EAI cog on a different bike.
@Gaston I'll consider that but I'm not a miche fand tbh, thanks for the tip though :)
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.. ;)