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Hot Topic (More than 10 Replies) Chainring Replacement (Read 1686 times)
Specialist
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Chainring Replacement
06/07/17 at 1:59am
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My 2016 Specialized Stumpjumper FSR recently started slipping when the cranks were under pressure. I checked fhe chain, found it was worn out, and replaced it. But during the test ride after it slipped and threw the new chain when force was put on the cranks without changing gears.

The large chainring has a few badly worn and one shaved tooth, and needs to be replaced. It's a 2x10 setup, truvativ (SRAM) 34t 104bcd. Thing is, I can't seem to find the part or a compatible aftermarket part anywhere online. There's one person selling it on eBay for like $65 which seems exorbitant since it's not even a high end part.

What gives? Do I have to buy the set or go to Specialized to get this part? Suggestions?

  
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Re: Chainring Replacement
Reply #1 - 06/07/17 at 2:33am
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Sounds like it's time to go to a 1X.  It should be a 104 bcd and you could go to a 36T.  Or remove the 2x and just install a 32t ring.  If the chain and ring are that bad, chances are high that the cassette is excessively worn as well.
  
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sCvHeaVens
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Re: Chainring Replacement
Reply #2 - 06/07/17 at 12:55pm
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The Cycle Path wrote on 06/07/17 at 2:33am:
Sounds like it's time to go to a 1X.  It should be a 104 bcd and you could go to a 36T.  Or remove the 2x and just install a 32t ring.  If the chain and ring are that bad, chances are high that the cassette is excessively worn as well.


Exactly - learned this myself; time for new cassettes / rings.  I would go 1x10 with a 32T
  
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Re: Chainring Replacement
Reply #3 - 06/08/17 at 9:37pm
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If you go 1x make sure you get a Narrow Wide Chainring.  It will help chain drops.
  
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Re: Chainring Replacement
Reply #4 - 06/08/17 at 11:24pm
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Thanks for the info. The cassette looks/shifts fine - I only have about 850 miles on the bike (I was surprised the chain wore out, seems a little early). In the interests of getting my bike back on the trails as quickly as possible, I'm going to go with the 36t 2x chainring. 

I am interested in going 1x11 but the work/technical aspect seems a bit daunting to get right. AND it looks like about $300 in parts, minimum. 
  
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Re: Chainring Replacement
Reply #5 - 06/09/17 at 1:37am
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If the chain was bad and the rings are bad, the cassette is bad.  Save yourself some time and aggravation and change it all.  The only way I was able to make the rings and cassette last longer was to replace the chain when it was .50 on a Park chain checker.  Any more and I was replacing rings and cassette with the chain to stop the "skipping".  Or just go SS and not worry about it Smiley
  
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Re: Chainring Replacement
Reply #6 - 06/09/17 at 10:03pm
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I took the advice that absoluteBlack offered, I have 3 chains for my trail bike, I rotate the chain monthly.

I normally ride through a chairing in 3-4 months, but have been a year on the one I am about the replace.  The XX1 cassette also seems to wear exceptionally well/slow with this rotating chain thing.

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Re: Chainring Replacement
Reply #7 - 06/10/17 at 8:06pm
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Specialist wrote on 06/08/17 at 11:24pm:
Thanks for the info. The cassette looks/shifts fine - I only have about 850 miles on the bike (I was surprised the chain wore out, seems a little early). In the interests of getting my bike back on the trails as quickly as possible, I'm going to go with the 36t 2x chainring. 

I am interested in going 1x11 but the work/technical aspect seems a bit daunting to get right. AND it looks like about $300 in parts, minimum. 

When the chain is worn badly so is everything else regardless of how many miles you have on it.
  
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Specialist
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Re: Chainring Replacement
Reply #8 - 06/10/17 at 10:00pm
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Okay, I went ahead and ordered an upgraded cassette and will replace it with the chainring. Question, will going from 34t to 36t make the new chain (that I just fitted) too short? Do I need to replace the smaller (22 t) chainring as well, or can my derailleurs (SRAM X7s) handle the gap from a 22t to 36t ring?
  
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The Cycle Path
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Re: Chainring Replacement
Reply #9 - 06/11/17 at 12:56am
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Specialist wrote on 06/10/17 at 10:00pm:
Okay, I went ahead and ordered an upgraded cassette and will replace it with the chainring. Question, will going from 34t to 36t make the new chain (that I just fitted) too short? Do I need to replace the smaller (22 t) chainring as well, or can my derailleurs (SRAM X7s) handle the gap from a 22t to 36t ring?

Yes, you will need to lengthen the chain.   22/36 is fine but I find a 24/36 setup to be a perfect 2x setup.  A 12 tooth jump seems to do better than a 14 tooth jump on the front.
  
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Specialist
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Re: Chainring Replacement
Reply #10 - 06/14/17 at 2:29pm
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Thanks. A few more questions (bear with me - new to the mechanical aspect of things):

1.  What type of Loctite should I use when I put the chainring bolts back? Or is it grease?
2. When I installed the new cassette (SRAM 1050, 11-36t), the rear derailleur won't shift to the two largest chain rings. Is it normal to have to adjust/index the rear derailleur when you change a cassette?
3. Still waiting on the 36t chainring to arrive, any suggestions on how best to lengthen the new chain? Power link or...?

Finally:

Is there a way to recycle old chains, cassettes, and chain rings?
« Last Edit: 06/14/17 at 4:30pm by Specialist »  
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Re: Chainring Replacement
Reply #11 - 06/14/17 at 6:30pm
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1. I don't normally locktite the chainring bolts.  I have used blue locktite in the past but not unless I had a problem with them coming loose

2. Shimano or Sram?  If you went to a larger big gear on the rear, then you may be contacting the larger gears and not allowing the derailleur to move laterally.  There should be some type of adjustment to reposition the derailleur to clear the larger gears. 

3. Add a piece of chain with another powerlink.   

Finally:  I've seen some pretty cool artwork with used bicycle parts but its a niche market for sure.  Once they are worn, they're pretty much scrap metal.
  
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