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@Wally
About two weeks ago,I picked up a Mavic Ellipse Track Wheelset.I took the stock cog off my Bianchi Pista and stuck it on,all fine so far.So during the next week of riding I notice my cog slipping every time I skid,not too much,but enough to make me faceplant..Every day after riding I tightened up the Lockring(with a lockring tool) but to no avail.There's no question about tightness of the lockring,I got it as tight as I could.So today,I decided to take the lockring and cog off,clean everything including the threads and stick em back on.When I stuck the lockring on,I tightened it as hard as i could,until the lockring met the bigger threads of the hub(where the threads for the cog start)..I then noticed that there is a gap of about 2 threads thick between the cog and the lockring, even though the lockring was super tight.
Can anyone give me any suggestions?Is it something to do with the fact that im using a bianchi cog meant for a bianchi hub?Are these crappy stock cogs made just for the stock hubs?Thanks for any help!
ps:Sorry if this post seems a tad long-winded,I'm really frustrated!!