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front chain ring replacements

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Old 06-03-12 | 11:23 AM
  #1  
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Old Peddler
 
Joined: Nov 2011
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From: Houston Texas area

Bikes: Trek Marlin 8

front chain ring replacements

I had my New Talus 29 Sport up on the stand today for a cleaning and brake adjustments
I got to looking at the Largest chainring, that I have only used maybe 5 times, and it seems to be a total pc of junk.
Every tooth on it appears different, Some are sharp, some are flat, in a very random order.
The Raleigh website says its a Shimano Alivo MC430 Octalink 22/32/44t ,
I suppose I could call my dealer and ask, but I am sure there gonna say its fine.
So my question to you guys is What I need to get to replace it? I imagine all 3 rings are the same quality
I'd prefer to do the work myself, But I am just not sure what to get or where? Surely I can use my cranks
and BB. I am on a budget, My riding is casual, Park trails, some off road trails
appreciate any advice

Thanks

Dave
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Old 06-03-12 | 12:08 PM
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From: The Hinterlands
Its much more likely that the different tooth profiles are by design (to aid shifting) rather than a result of poor manufacturing by Shimano.
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Old 06-03-12 | 12:19 PM
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Old Peddler
 
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From: Houston Texas area

Bikes: Trek Marlin 8

very interesting, I was looking at chain rings on Jensons site, Shimano's and in the enlarged view they too looked irregular
I guess its suppose to be that way. Looks odd, looks worn out

thanks

Dave
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Old 06-03-12 | 12:20 PM
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Originally Posted by cryptid01
Its much more likely that the different tooth profiles are by design (to aid shifting) rather than a result of poor manufacturing by Shimano.
Bingo.
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Originally Posted by sp00ki
Using a nicer sealed bearing headset vs a $10 set is like throwing a frisbee vs a dodgeball.
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Old 06-03-12 | 12:30 PM
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+2 shaped teeth are on purpose.

If you never use the large chainring, you could replace it with a bashguard. Nice for keeping the other chainrings from getting messed up when clearing big logs and other obstacles.
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