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my cog is stuck :(
edited for clarity
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PB blaster, any hardware store will have it, breaks rust/frozen/stuck metal parts faster and more effectively than anything I have ever seen
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Unscrew it using your own bike as the chainwhip (take off the lockring and pedal backwards). You can generate a lot more force this way. At least it seems like a good idea to me right now, but so did that last beer run tonight...
a grain of salt, please. |
There was also a thread a while back about taking your chain off the chainring and let it fall loose over bb wrap the slack chain around your cog so that when you rotate it it gets caught around your cog and stuck. If you do it right you can generate an insane amount of force to take that bad boy off. Just be careful and make sure you're turning the right way, vomitron snapped his cog into two pieces doing that.
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Try WD 40. Spray, set it and forget it... after an hour try. It probably will loosen the stiff cog.
Of course, I'm not a mechanic or handyman. |
I prefer Liquid Wrench over WD-40, works really well.
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Specifically we're referring to what we've taken to calling "the Italian technique". This URL: http://204.73.203.34/fisso/eng/schpignone.htm has info on putting it on, but you can use the same method for removal. I've done both recently.
But I still use a lock ring, thanks. |
If all else fails, buy/rent/borrow/steal a blowtorch. Heat up the cog, especially around the threads. That sucka WILL come off.
Try the Italian technique to take the cog off, you will be surprised at how well it works. I used that twechnique to tighten down a cog on a bike, and I was able to get the cog at least 1/2 turn tighter than I could by riding the bike or by a chain whip... Make sure that you are turning the right direction, though. And use a rag or something to protect your bb shell. |
Just remember to go in the OPPOSITE direction of the pics for the "Italian method" since you want to remove, not install. I'm assuming you are comfortable with the righty-tighty lefty-loosey concept, but you never know.
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Originally Posted by ryan_c
Just remember to go in the OPPOSITE direction of the pics for the "Italian method" since you want to remove, not install. I'm assuming you are comfortable with the righty-tighty lefty-loosey concept, but you never know.
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Originally Posted by junioroverlord
As I said, vomitron snapped is cog into pieces tightening when he was trying to loosen. I think I need to tattoo righty tighty lefty loosey on the back of his hand or something.
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I feel your pain... I'm in the same boat. I wanted to use the cog on a different wheel, but am contemplating just buying a new one. Time is money ;) Any hour of struggling is worth more than a new cog, right?
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Originally Posted by chrisgerne
in trying to unscrew the 15t, i've broken two chainwhips. the freakin' thing wont move. any ideas? |
Originally Posted by Phatman
return the cog and get a smaller chainring?
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Originally Posted by BostonFixed
If all else fails, buy/rent/borrow/steal a blowtorch. Heat up the cog, especially around the threads. That sucka WILL come off.
Have you personally (or know/seen) anyone who's done this? It seems that with the steel (cog) and alum. (threads on hub) the alum. hub would expand faster than the steel cog, making it even harder to take off. Of course I don't have any real experience with any of this beyond idle speculation. |
Originally Posted by Lucky-Charms
Have you personally (or know/seen) anyone who's done this? It seems that with the steel (cog) and alum. (threads on hub) the alum. hub would expand faster than the steel cog, making it even harder to take off. Of course I don't have any real experience with any of this beyond idle speculation.
I think that the alu will expand faster, but the expansion/cooling of the cog/threads may break the "seal"... |
Originally Posted by chrisgerne
i picked up an old duracycle moth about a year ago... i've gone and sold the frame, because it was way too big for me.... but kept all the goodies.... i picked up a MUCH smaller pinarello xcross frame, and threw the wheels and cranks on it.... not so much threw, as carefully and lovingly wrenched into place.
anyway. i've been riding it 52x15 for the entire time. my legs are pissed.. riding up the williamsburg bridge is a pain in the ass... but it definately has its benefits.... It keeps me at pace with or faster than traffic when i need it (specifically the sprint down delancey to the bridge).. but i went ahead and bought a 17t cog... needless back story... here is the problem at hand. in trying to unscrew the 15t, i've broken two chainwhips. the freakin' thing wont move. any ideas? you need to come down off the 52T and use 49T you will love it and you won't pay later for it! Ask you knees about it! Put it in a vise to take it off. S/F, CEYA! |
Originally Posted by BostonFixed
I have not personally tried this method on a cog, but It worked for me to get an old BB off a POS frame. When I used to work in a sketchy LBS, we also used this method to get parts off of old junker frames. Not specifically on cogs, but seatposts, bbs, etc.
I think that the alu will expand faster, but the expansion/cooling of the cog/threads may break the "seal"... |
Originally Posted by Ceya
Put it in a vise to take it off.
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Put the cog in a vise between two pieces of wood. Use the wheel as your lever to unscrew the cog. Nothing works better for putting them or taking them off.
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Originally Posted by chrisgerne
ps. its pretty much impossible to find a 48 or 49t chain ring with a 130bcd..
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Originally Posted by chrisgerne
the "italian method" worked wonderfully.... went from a 15 to a 17 in the back. not too much of a difference, but i'd been riding 42x15 for about 3 or 4 days and i hated spinning out on the sprint down the bridge..... talk about a wicked cadence.
52x17, thank you lord. S/F, CEYA! |
Originally Posted by chrisgerne
(Post 1008385)
the "italian method" worked wonderfully.... went from a 15 to a 17 in the back. not too much of a difference, but i'd been riding 42x15 for about 3 or 4 days and i hated spinning out on the sprint down the bridge..... talk about a wicked cadence.
52x17, thank you lord. hell yeah the italian method just worked for me too!!!!!!!!!!!! :love::twitchy::rolleyes::love: i almost broke my chain whip earlier and then i found this thread and the link :thumb: |
did you remember to grease your cog's threads before putting it on so this situation doesn't come up again?;) or at least making this situation a lot easier to deal with.
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the last time this happened, i rode itwith no lock ring and did some skids to get it off. i did make sure to get it all the way and i did have brakes on the bike
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