Stripped hub - feck!

Get a sharp bradawl or similar, and chase the threads with that at an oblique angle. Other than getting a large diameter tap, there isn't much more you can do. Don't under-estimate the virtue of smacking the fick out of it on a hard surface with a decent hammer to shirt the crap out too.

You need one of these, a thread file (with the internal thread bits at the end), and a vice to hold the cog.
Could help, but I'm the wrong part of town.

I've stripped the threads on two hubs over the last week. What am I doing wrong?

Both times, I noticed the sprocket slip during a polo game. And both times I tightened the sprocket then the lockring, and the lockring just started spinning.

Was the damage already done when the sprocket initially slipped? Am I tightening the lockrings too much? (I kind of assumed there was no such thing as over-tightening a lock ring). Or is it just that the hubs were both cheap?

Cheap hubs. I've stripped the lockring threading on a hub before (not fun when you're brakeless) but it was only because it was so cheap. You can over tighten a lockring, just do it up hand tight, don't put your weight on the tool to do it up.

just do it up hand tight, don't put your weight on the tool to do it up.

Worst advice ever! Always use a lockring tool and always use a bit of elbow grease!

If you're riding on hubs that strip when you put the appropriate amount of torque into them... you're doing it wrong.

Well how else are you going to put it on if you don't use a lockring tool? I didn't say don't put them on tight, just don't over tighten them by putting your body weight on the tool and keep pushing.

put cog, tight it
put lockring, tight it
retight cog
retight lockring
use a decent tool
apply force, a fairly amount (in my case always lots, all my weight and I'm heavy)

cheap hubs are not the problem, thousand of people in this forum use System X, On-one, Ambrosio, BLB.... without any problems what so ever
if the threads of the cog are fuck, it can be the problem,
if not, the way the cog + lockring are put on is teh problem (IMHO)

apply force, a fairly amount (in my case always lots, all my weight and I'm heavy)

Exactly. Me too.

my logic is, the amount of force you are putting on the cog/lockring has to be greater or at leat equal, to the forces applying in the cog while you are skidding. in my case if I weight 100kg, that cog need 100kg to dont slip,
this is my rule of thumb, probably MCCD tester, has the proper rule, or the academic anwser...
I have never strip and hub

Well I've used my method on System X hub's for ages with no problems, it was only on the Quando hub I used I managed to strip the threading on and since then I've been more careful. If the lockring isn't quite done up tight enough, it's not going to come off, the sprocket will just unscrew a bit before the wheel locks, then when you pedal it will screw on again.

Hey guys been riding my fixed for about 6 months and skidding A LOT. The thread stripped on one side of the hub so I flipped it over but after about another month I noticed last week that the other side is starting to go so at the moment I'm not skidding at all. I've made sure the cog and lock ring are tight.

From what I've been reading I'm getting the impression this isn't totally uncommon if you skid, but how do I stop it? Is it an inferior hub? Not sure what hub I have but the bike is a Rocky Mountain Boroughs '09 and I suspect the hub isn't the best. I'm guessing a steel hub with steel cog would be best. Has anyone tried splined hubs?

I'll stopped rambling now, if anyone's got any advice I'll be very interested to hear.

Cheers!

Go and buy a bolt on sprocket and a hub to match. Velosolo do them ready to use.

"From what I've been reading I'm getting the impression this isn't totally uncommon if you skid, but how do I stop it."

Stop Skidding - use your brake - problem solved

Skidderz gonna skid...

"From what I've been reading I'm getting the impression this isn't totally uncommon if you skid, but how do I stop it."

Stop Skidding - use your brake - problem solved

Now where's the fun in that?

Cheap hubs? Ill-fitting lock-ring? Poor installation? Bolt-on cogs aren't necessary.

I have a feeling it's cheap generic hubs, I'm having a better hub fitted monday

what hub was it so others know to avoid them in the future

To the forum god of hippy and VB,
Apologies if this is repeated somewhere else but I don't know the answer so don't if it's been answered.

Tonight I stripped my goldtec pro hub going down highgate. It's about the 3rd hub I've totalled. I cannot figure out what I'm doing wrong and really and truly need the help and wisdom of the forum.

This time out particularly I paid close attention to what I was doing. If I didn't I would lose the expensive goldtec hubs as I had stripped the other side. I've lost 2 other hubs including a blb (formula) hub on a purpose built wheel...

I would like any advice.
Are there lockrings or cogs or hubs that won't match?
Are there threads that aren't right for eachother?
Is there any special technique in 'locking' them?

I'm at a serious loss here.

Cheers for help in advance

What am I doing wrong?!?

I'm not sure anyone's goin to take you up on your offer of a stripped hug, but good luck with the mechanicals.

Ha!

Please don't change the name of this thread.

Oh...

Now I get it...

Feck

Please people chip-in...

Are there lockrings or cogs or hubs that won't match?

Yes. There are a couple of common lockring threads. JIS and ISO (Shimano & Campag + some strangeness from Mavic).

Are there threads that aren't right for eachother?

See above. All the cog threads are the same.

Is there any special technique in 'locking' them?

Tighten the cog down, followed by the lockring. Both need to be tightened down hard. Once you've ridden on it, re-tighten the lockring after you've put some forward force through the pedals.

Don't go skidding all over the shop before you've got it tight.