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#1
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Bent chainring options?
I had been having difficulty with chain skip. I noticed this a few
days after I had been cut off by a small van, unavoidanbly crashing into it, and landing on my right side. Minor scrapes and bruises to me, and the bike. On the workstand, with the chain removed, I can see a very tiny bit of wobble on the outer chainring, and none on the middle. I taped some stiff cardboard to the bike for a makeshift alignment gage, while rotating the crank to detect rotational alignment. I noticed that my small chainring is bent. It has about a 1/8" rise towards the crank along a few teeth. I can't tell if the spider is bent, although it does not appear to be. There was no visible damage to the pedal, crankarm or rings. I did land with my right foot locked to the pedal. Shifiting is fine with only the chain skip problem when climbing 5-7% grades and shifting into the second lowest gear. I let up on the pedalling when shifting. One skip over a few teeth, and then it settles in. If I first shift into the second lowest cog while on the middle chainring, and then shift onto the small chainring the skip does not occur. The chainring is a Cannondale PX triple 30/42/52, and the bottom bracket is a Shimano RSX. My present crankset is a Cannondale PX 30/42/52. If the crankset has to be replaced can I use the Shimano 105, 30/42/52, FC-5505 crankset? Anyone know if the FC-5505 will fit my RSX bb? Thanks, Joe |
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#2
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Bent chainring options?
Joe wrote:
I had been having difficulty with chain skip. I noticed this a few days after I had been cut off by a small van, unavoidanbly crashing into it, and landing on my right side. Minor scrapes and bruises to me, and the bike. Heh, I had almost the exact same thing happening to me a few weeks ago. Crashed, and 2 weeks later when I got back on my bike again, I noticed the chain would skip wildly on the outer chainring. Turned out one of the teeth in chainring was bent. A riding buddy of mine said that fixing something like that is almost impossible, and that you're better off getting a new chainring, which I did. |
#3
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Bent chainring options?
A shy person wrote:
I had been having difficulty with chain skip. I noticed this a few days after I had been cut off by a small van, unavoidanbly crashing into it, and landing on my right side. Minor scrapes and bruises to me, and the bike. On the workstand, with the chain removed, I can see a very tiny bit of wobble on the outer chainring, and none on the middle. I taped some stiff cardboard to the bike for a makeshift alignment gage, while rotating the crank to detect rotational alignment. I noticed that my small chainring is bent. It has about a 1/8" rise towards the crank along a few teeth. I can't tell if the spider is bent, although it does not appear to be. There was no visible damage to the pedal, crankarm or rings. I did land with my right foot locked to the pedal. Shifiting is fine with only the chain skip problem when climbing 5-7% grades and shifting into the second lowest gear. I let up on the pedalling when shifting. One skip over a few teeth, and then it settles in. I have an article on Straightening Chainwheels, see: http://sheldonbrown.com/straighten_chw.html The chainring is a Cannondale PX triple 30/42/52, and the bottom bracket is a Shimano RSX. My present crankset is a Cannondale PX 30/42/52. If the crankset has to be replaced can I use the Shimano 105, 30/42/52, FC-5505 crankset? Yes. Anyone know if the FC-5505 will fit my RSX bb? It will not, you'll need a new bottom bracket too, but this is much cheaper than the crankset. Sheldon "Upgrades" Brown +------------------------------------------------------------------+ | Also, are you familiar with the PTF-PTM manufacturing technique? | | (This term comes from the bridge-building industry.) Stands for | | "pound to fit, paint to match." --Steve Palincsar | +------------------------------------------------------------------+ Harris Cyclery, West Newton, Massachusetts Phone 617-244-9772 FAX 617-244-1041 http://harriscyclery.com Hard-to-find parts shipped Worldwide http://captainbike.com http://sheldonbrown.com |
#4
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Bent chainring options?
On Mon, 14 Jul 2003 12:55:26 -0400, Sheldon Brown
wrote: A shy person wrote: A hirsute guru responded: I have an article on Straightening Chainwheels, see: http://sheldonbrown.com/straighten_chw.html Thanks, that was the first thing I did prior to posting my question. I was unable to apply enough leverage to the small ring at the appropriate point to make a difference. Didn't want to apply a mallet for fear of doing some unforseen damage. My present crankset is a Cannondale PX 30/42/52. If the crankset has to be replaced can I use the Shimano 105, 30/42/52, FC-5505 crankset? Yes. Thanks again, good to know. Anyone know if the FC-5505 will fit my RSX bb? It will not, you'll need a new bottom bracket too, but this is much cheaper than the crankset. Gracias again. Joe |
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