I provided the usual backpressure to the pedals this morning at a stop light only to begin freewheeling on my fixed hub. The cog stayed in place thanks to the lockring, but it freewheels now. I am afraid to get home and look at my nice Campy hub. How likely is it that the threads are ruined? Lesson learned-- the no-name cheapo cogs are not a good deal.

you're freewheeling? can you still pedal?

if the cog just spins no matter what you do it's almost certainly stripped.

if the cog stayed on there, but spins in both directions freely, the threads on the hub are most likely destroyed.

Yes, freewheeling back and forward. Walking to work.

sorry to hear that, good luck, I will cross my fingers for you

ugh, almost certainly stripped, and not repairable afaik.
you can probably jb weld the cog on, and ride it like that forever, you just won't be able to change the cog.

every month i hear another story about cheap cogs ruining nice hubs. can we make it a sticky or something?

Posting while walking, while pushing your bike?

Posting while walking, while pushing your bike?

Yes, multi-tasking with just a front brake.

Well I removed the cog and yes the hub threads are gone. Now I need a new rear wheel. Any guidance, it doesn't need to be fancy...I'm on a buget. It was a campy record high flange hub laced to an MA-3 rim.

I would go for IRO. I think a rear hub is around $40 and use your MA-3

Is this more than just a crap cog with Campy hub?
https://www.sheldonbrown.com/harris/record-track.html

I took Cynikal's advice and ordered an IRO rear hub and lock ring. With shipping and handling it comes to $62. The good thing is I beleive I can use the spokes from my old wheel and lace the same rim to this new hub. I couldn't find a better deal anywhere, even though this is going to take some time to build before I can get this bike going again. Need a back up set of wheels. Need more $$.

You won't be sorry with the IRO. I love mine. I just swapped cogs after a year of use, and my threads are still minty. Smooth rolling too. And Tony rules.

hey betty bump, your story is just like mine, except i was using s.h.i.t.t.y components. i bought my first fixie from a friend who rode for three years on a sovos hub (yeah, yeah, i know, whatever), and like three weeks into riding it, the arse-quality cog stripped the threads. so i scrounged up some money, bought a (somewhat) better hub (suzue basic. yeah, yeah, i know*), and built up a new wheel from the old rim. was my first wheelbuild, too, and i used sheldon brown's step by step instructions, and it was a whole arseload of fun.

*some people don't have the money to be super finicky about their components...

I don't have a lot of scratch laying around either, but I am kicking myself for using the cheap cog because I have a nice Suntour cog hanging on a nail. I am an idiot, which hurts more than spending money even.