Wits end removing the last screw on chainring
Hello,
I have 5 year old bike that I'm learning to service, I'm removing the chainring and have removed the 4/5 hex keys with the chainring wrench but the last nut simply won't unscrew however tight I hold the wrench it simply rotates over it :( Any idea how else I can remove it? Any help is appreciated https://cimg0.ibsrv.net/gimg/bikefor...6aacecbd59.jpg |
I would lay it flat drive side down, add penetrating oil, and let it soak a day or two. If the chain has that much rust then the chain ring bolt might have rust too.
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Originally Posted by grizzly59
(Post 21551993)
I would lay it flat drive side down, add penetrating oil, and let it soak a day or two. If the chain has that much rust then the chain ring bolt might have rust too.
Here is a gif https://gifyu.com/image/u1VY |
Clamp the wrench down to the chainring with vice grips and loosen with allen keys.
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Try the above. Also, I have had good luck with an electric impact wrench. My last stuck chainring bolt I had to drill out. Not too bad of a job. Replacements are not too expensive.
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However you get them out, I’d advise replacing them with truvativ chainring bolts, which use hex holes on both sides.
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1 Attachment(s)
The VAR-35200 is designed for this type of chore. Unfortunately, it's not cheap, but perhaps a local bike shop has one and can remove the bolt for you? Make sure the bolt threads are lubricated to reduce the chances of this happening again.
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Originally Posted by JohnDThompson
(Post 21554943)
The VAR-35200 is designed for this type of chore. Unfortunately, it's not cheap, but perhaps a local bike shop has one and can remove the bolt for you? Make sure the bolt threads are lubricated to reduce the chances of this happening again.
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Originally Posted by TejanoTrackie
(Post 21554983)
It looks like that tool is designed primarily for tightening chainring bolts, not loosening them. As soon as you begin to loosen the bolt, it will lose its grip on the nut, and allow it to spin in the chainring it the bolt is seized up inside the nut.
Not the best picture if you're trying to sell em! Barry |
Originally Posted by Barry2
(Post 21555376)
That appears to be a spring on the device, not a thread. So as you turn to extract the bolt, it wont back off.
Not the best picture if you're trying to sell em! Barry |
Originally Posted by TejanoTrackie
(Post 21554983)
It looks like that tool is designed primarily for tightening chainring bolts, not loosening them. As soon as you begin to loosen the bolt, it will lose its grip on the nut, and allow it to spin in the chainring it the bolt is seized up inside the nut.
https://www.vartools.com/en/combined...s-var-p828.php |
Originally Posted by Scrodzilla
(Post 21555445)
It both loosens and tightens. I have one of the newer versions and use it all the time at the shop. I don't think it would do much on a bolt that's really stuck though.
https://www.vartools.com/en/combined...s-var-p828.php |
A drill, bolt extractor tool and hammer.
I have a Craftsman set, not expensive; instructions on the tool sleeve. Drill, hammer in the tap and unscrew with box wrench around the tap. |
Originally Posted by Digger Goreman
(Post 21555469)
A drill, bolt extractor tool and hammer.
I have a Craftsman set, not expensive; instructions on the tool sleeve. Drill, hammer in the tap and unscrew with box wrench around the tap. |
Originally Posted by TejanoTrackie
(Post 21555460)
Curious, how do you deal with stuck chainring bolts ?
https://www.vartools.com/en/chainrin...r-var-p409.php |
Originally Posted by Digger Goreman
(Post 21555469)
A drill, bolt extractor tool and hammer.
I have a Craftsman set, not expensive; instructions on the tool sleeve. Drill, hammer in the tap and unscrew with box wrench around the tap. |
Originally Posted by Scrodzilla
(Post 21555536)
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Originally Posted by Digger Goreman
(Post 21555469)
A drill, bolt extractor tool and hammer.
I have a Craftsman set, not expensive; instructions on the tool sleeve. Drill, hammer in the tap and unscrew with box wrench around the tap. |
Originally Posted by Scrodzilla
(Post 21555536)
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If you hold the outside with an allen wrench, you can drill the inside. Big enough bit to do the job but not touch the crank spider or chain rings. If you're good with a vise grip you may want to give that a try first.
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When I drilled mine out 2 weeks ago I used the little wrench tool on the back and drilled out the hex side. The worn nubs still had enough grip to let me drill the bolt out. Not too bad a job. The bolt poped out with no damage to the crank arm.
Ride Safe, Joe |
Try heating with a torch. Otherwise just drill it out.
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Originally Posted by JohnDThompson
(Post 21554943)
The VAR-35200 is designed for this type of chore. Unfortunately, it's not cheap, but perhaps a local bike shop has one and can remove the bolt for you? Make sure the bolt threads are lubricated to reduce the chances of this happening again.
|
Originally Posted by JohnDThompson
(Post 21554943)
The VAR-35200 is designed for this type of chore. Unfortunately, it's not cheap, but perhaps a local bike shop has one and can remove the bolt for you? Make sure the bolt threads are lubricated to reduce the chances of this happening again.
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