Very stuck cog...
 

I was trying to remove the cog on my Motobecane Messenger today to put on a newer cog, removed the lockring and put the whip on and couldn't budge it no matter how hard I tried. So I put the wheel back on to reverse rotafix it and the chain snapped on me. Haven't had the bike for more than 6 months and it only has 2-300mi on it so far. The lockring was loctited on and I can only assume that the cog is too. Is there any way I can get this off without going through more chains?

Thanks for any help,
John

What kind of loctite did you use? I'm pretty sure if you are using red loctite, you have to heat it up to loosen its grip.

I wasn't the one that applied the loctite. It was that way from the factory. The lockring was on there with red loctite. Thanks for the advice.

If it isn't red loctite, I use the same trick that I use with freewheels. I lean the wheel into a door frame and hold it with my hands. I then take the chainwhip and wrap it on good. Then I put my foot on it and then lightly jump to remove.

Wrap a chain around it and put in clamp. Probably can't use cog again

No problem...found this on the Loctite consumer products website:

**************
How can I remove Loctite Threadlockers?

Blue: Can be removed with hand tools
Red: Apply heat to remove
Green: Apply heat to remove

**************

kroil.

Putting Kroil on a red Loctited cog will result in a stuck cog with Kroil on it. If some moron really did red Loctite the cog, it's going to take heat, which will screw up the grease in the hub. So after you heat up the cog and remove it, you get to repack the hub as well. There's no reason to use any kind of Loctite on a cog.

Oh, and if your chain broke from any amount of force you could generate with your arms your chain needed to be replaced anyway.

So far... new cog, new chain, repack hub, smack some moron for using Loctite on a fixed gear.

HTH!

i remember when i tried to take the cog off of my motobecane messenger.

the lockring was no problem but i think i bloodied every single knuckle trying to get the effing cog off. it was the first time i ever attempted this, but i had to wrap rubber bands around the chain whip and handle to get enough coverage to get it to work right. after that, i had a rubber mallet and hit it quite a few times.

but ya, i havent heard anyone one else mention this specific problem, so i thought i was the only one. so to summarize, the chain kept slipping when i was using the chain whip as intended, so i bound the chain whip to the cog so it couldnt slip and gently hammered away

Judging by the amount of hack mechanics in this thread, I would say they weren't totally unjustified in putting red loctite on the parts. Although it is a little excessive. Either that or you start warrantying a bunch of stripped rear hubs because people don't maintain their ****.

Well, yeah, red loctite is fine if you're running a suicide hub but I don't really get why anyone would put loctite on a proper fixed gear hub with threads for both the cog and lockring. In this case, its like the loctite is the answer to a problem that doesn't exist.

Yeah i'm just imagining all the noob posts about strippped lockrings/cogs/hubs on this forum and IRL.

Take it to your LBS before you destroy it.

clamp the cog horizontally in a bench vice. only the teeth should touch the vice and you shouldn't need to really crank on the vice to hold it securely (or you'll be buying a new cog). then you can use the entire diameter of the wheel as a lever. works great.

There are actual tools for this that don't risk destroying your cog; i.e. the cog vise:

http://os2.dhs.org/~john/cog-vise1.jpg

Fit the cog vise onto the cog teeth:

http://os2.dhs.org/~john/cog-vise2.jpg

Clamp into bench vise:

http://os2.dhs.org/~john/cog-vise3.jpg

Using the wheel for leverage, unscrew the cog from the hub, leaving the cog undamaged in the vise:

http://os2.dhs.org/~john/cog-vise4.jpg

it really shouldnt be this difficult. locktite should not be used for this purpose, or anywhere on the bike.

otherwise your excution of using the previously mentioned techniques was wrong.

I'm guessing you didn't even bother reading any of the previous posts. Red loctite is only removeable using heat. That suggestion was given in post #6.

The solution to incompetence is not Loctite.