Sprocket failure

I tried a search on this but found nothing, so apologies if it's a repost.

Yesterday my sprocket failed badly, popping off the thread of the hub and leaving me clipped into a bike which I had no proper way of stopping going down a hill!

Basically I should've picked up on it sooner but tried to ignore it because I had a busy day. The sprocket moved a few times when I was accelerating away from lights and it obviously came loose and now I've paid the price.

The threads on the different components all looks reasonably good, the thread on the Surly sprocket is practically perfect, it's only a month or so old anyway. The lockring (Surly) and lockring thread on the hub (on one) are slightly damaged but not much. If was any other component I'd just chuck it back on.

The sprocket was attached to the bike by my LBS and I bought the sprocket and lockring from them firsthand.

Is this in anyway their fault, could the combination of components be a problem?
Should I just locktite it and put it back on?

Thanks in advance, Tim

no it is your fault for riding brakeless and ignoring critical maintenance issues with your only brake. you idiot.

lockrings and cogs come loose anyway, you have to tighten them every so often. you have ignored this problem, and it got to the point where it was so loose it flew off.

i suggest you take it back to your LBS, get them to assess the damage, and buy yourself a brake.

vélo libre !

Get in !

Doof, doof, crack !

perhaps you should make an animation using the follow images

no it is your fault for riding brakeless and ignoring critical maintenance issues with your only brake. you idiot.

lockrings and cogs come loose anyway, you have to tighten them every so often. you have ignored this problem, and it got to the point where it was so loose it flew off.

i suggest you take it back to your LBS, get them to assess the damage, and buy yourself a brake.

I concur.

I was just surprised how few miles it took before this happened!

I'm getting a break as soon as I get paid, I can't even afford handlebar tape atm.

does your bike have an arrospok? sell that and buy a new set of wheels, a front brake, some bar tape and have change left over for a curry and beer.

does your bike have an arrospok? sell that and buy a new set of wheels, a front brake, some bar tape and have change left over for a curry and beer.

On One hubs laced to Open Pros.

Another thing which worries me is that the wheels were cheap (£80 the pair) but the thread on one side of the hub is completely trashed, does this signal a problem with the hub or just bad usage?

I'd heard that on one are pretty good for their price

http://www.flickr.com/photos/33449131@N02/4475295923/

maybe try a bit of loctite and a different lockring.
threads from different manufacturers vary a bit so you may end up with a tight fitting lockring (you could end up with the opposite though)
my EAI cog and goldtec hub was a very tight combo it took 3 people and a scaffold pole as a lever to fit/remove the cogs.

Sound like it wasn't tightened enough (cog slipped a bit).

Threads on any hub can get trashed if you're riding with a sprocket that's not on properly, a loose sprocket puts forces on the lockring that it's not designed for. I'd check the lockring threads very carefully as it's possible a few may have been stripped, and they're more important than the sprocket threads.

Also, IMO you shouldn't ride brakeless if you're not in possession of the tools or knowledge to fit a sprocket properly yourself.

A brake would have helped here

ho hum.

So, on closer inspection the lockring thread on the hub is screwed. It's ripped off over half of the thread and left the surface completely flat.
I still think there's more to it than just keeping it adjusted, a lockring/sprocket combo shouldn't do that surely, particularly if it was installed 'professionaly'?

Now I have to make the hard decision of wether to buy another one one hub which will use the same spoke length and I can just re-lace the wheel or go with something a bit more heavy duty, I don't want that happening again!

Threads on any hub can get trashed if you're riding with a sprocket that's not on properly, a loose sprocket puts forces on the lockring that it's not designed for. I'd check the lockring threads very carefully as it's possible a few may have been stripped, and they're more important than the sprocket threads.

Also, IMO you shouldn't ride brakeless if you're not in possession of the tools or knowledge to fit a sprocket properly yourself.

I just haven't got the money to buy a sprocket tool, I've fitted and removed sprockets with a chain whip and an old bb tool but I was buying the stuff firsthand and it seemed easier and more reliable.

This is a brake.

And this is a break.

.

Give up and get the bus and save money, buy a new on one hub, BRAKE and lockring tool, rebuild wheel, rotafix the cog, lockring tool the lockring, fit wheel and brake to bike then ride.

forget the locktite or anything except very clean thread on cog and hub (clean then white spirit) -

at these torques the 'glue' just acts as a lubricant.

tighten it rortrax style

Advice greatly appreciated.

Does anyone know if On One still sell the rear of this http://www.on-one.co.uk/i/q/HUOOTRSF/on-one-small-flange-track-hub type of hub?

Using threadlock on the sprocket would be a bad move. That is not what threadlock is for.

Kudos Ideal. Despite the mild flaming as a result of the classic "how do you stop without a brake" stupidity, you're displaying an incredible humble pie eating talent... usually people have a bitch fit

Pie's too good for him... It's Humble Crumble* time...

• © Balki
  

hey I like crumble.

crumble>pie.

With all due the tinest bit of respect, you're not doing it properly.

hey I like pie.

pie>crumble.

Fixed... ;P

With all due the tinest bit of respect, you're not doing it properly.

that for me or mr.slain? :)

Do you have problems getting crumble to fit your wide sit bones ed? ;)

Fixed... ;P

how did you do THAT? Your coding skillz are mad tech :P