So I was doing skids in a wet parking lot today, and my cog was slipping on my hub. This is the second time this has happened. I get home and tighten the cog and lockring--hard. Rotafix for the cog, lockring tool for the ring. Before I did this, I removed them to have a look at the threads and make sure the cog was adequately greased. The hub threads looked normal, but there was a small ribbon of aluminum--maybe .5 mm wide and very thin--stuck to one of the threads of the cog. Is this something worth worrying about, or should I just not sweat it as long as the cog stops slipping? It's a Formula hub, EAI cog, DA lockring. Oh, and before I get crap for noob questions, yes, I did use the search feature.

Didn't you already post this here? Aluminum cog?

No. It's a steel EAI cog. The Al came from the hub. And I've never posted a thread before.

it SOUNDS like your hub is getting stripped, but it doesn't make any sense; formula/eai/da are all well-tested parts.

any chance of a really tight macro shot of the hub threads?

I beg to differ: https://www.bikeforums.net/singlespeed-fixed-gear/159211-slipping-cog-hub-damage.html

My bad. I got a database error message from BF and i thought it didn't post. And I'll try to get a photo.

those little slithers of metal are NO good

I'll repeat what I was thinking in your earlier post.

That stripped aluminum didn't magically appear from the ether - it sounds like you're stripping your hub. Either it wasn't torqued down enough in the first place or your current setup isn't compatible. Maybe your cog is too narrow and the lockring isn't able to adequately tighten against it.

I hope it's a flip flop.

$0.02

- eyefloater