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I've read of people having problems with anodized or plated cogs as the extra coating can make the threads tight enough to strip the hub, raw steel like Dura Ace or Phil cogs will not have this problem. It could be that your hubs have slightly worn threads on the first part and that this makes a difference, or someone used them with a freewheel? I'd try a DA cog anyway, good quality and you know it will work!
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Only problem with DA cogs is that they only go up to 16t? Or can they be found with more teeth?
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@mcamb I would have gotten a DA cog but the starfish won't take anything smaller than 50t and 50/16 is too high a gear for me, I prefer sub 3. gear ratios. Also, the EAI cog in question is the non-plated steel deluxe version which I thought was pretty similar to the DA cogs.
MCamb
Sig_Arlecchino
I received the EAI cog today and tried to thread it onto the mavic hubs. First half or 2/3rds thread on smooth but then there'a considerable resistance. I don't want to risk threading the hubs so i didn't force it on with the chainwhip. I tried it with a cheapo generic cog and it went on fairly smooth all the way. Anyone experienced something like that with EAI cogs? The other problem seems to be that the threaded section is a bit longer on the EAI cog than on other cogs so the lockring wouldn't be fully on. Any recommendations for other quality 19t 1/8 cogs, preferably with a slimmer threaded section? What about Halo cogs?
p.s. if anybody has sth in their parts bin that would tick the boxes, please let me know!
pps: hubs are mavic 520s and according to @Gaston and the internet, they're iso compatible.