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Normal Topic Derailler frustrations (Read 993 times)
MrFixit74
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Derailler frustrations
08/22/18 at 10:33pm
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Hi guys, im new here. I have a strange issue with my rear derailler (2018 Shimano SLX). It constantly skips the 3rd sprocket when im upshifting. I can adjust it to shift like butter all the way up but then downshifting is all chunky and skips very bad. I can adjust it the other way and downshift perfectly, but upshifting is terrible. I can dial it in perfectly except for this problem with the 3rd sprocket. Ive cleaned and lubed my drivetrain and replaced my cable 2x with no change. Im sure there is a super simple fix for this but i am not seeing it.
  
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traildog
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Re: Derailler frustrations
Reply #1 - 08/22/18 at 10:40pm
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Have you checked the derailleur hanger?  A bent hanger can cause a whole host of shifting issues that cannot be corrected with adjustments.  Any shop should be able to do it.
  
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Putt Nasty
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Re: Derailler frustrations
Reply #2 - 08/22/18 at 10:45pm
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Sounds like B-tension may be off. 
Closer to cassette (dialed out)= more chain wrap & better shifting.
  
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MrFixit74
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Re: Derailler frustrations
Reply #3 - 08/22/18 at 10:52pm
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I checked the hanger and it looks fine, when i bail i always go off the left so it hasnt taken any hits. And i also gave the B screw a couple of turns and still have the same issue. All other gears shift perfectly
  
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Saltnpepper11
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Re: Derailler frustrations
Reply #4 - 08/23/18 at 12:25am
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Take it to a shop and have them check the hanger with one of their gauges. Something small could have bent it or it could be a damaged cassette ring I have had a brand new Shimano SLX cassette come with a bad Cog on it. As I've also seen hangers come bent out of the box or not necessarily been just not aligned properly for the bike!
  
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traildog
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Re: Derailler frustrations
Reply #5 - 08/23/18 at 2:39pm
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MrFixit74 wrote on 08/22/18 at 10:52pm:
I checked the hanger and it looks fine, when i bail i always go off the left so it hasnt taken any hits. And i also gave the B screw a couple of turns and still have the same issue. All other gears shift perfectly


Can't check a derailleur hanger by looking at it. Gotta have the tool to align it with the rear wheel.
  
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OoHoO
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Re: Derailler frustrations
Reply #6 - 08/23/18 at 2:57pm
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traildog wrote on 08/23/18 at 2:39pm:


Can't check a derailleur hanger by looking at it. Gotta have the tool to align it with the rear wheel.


Yep, gotta ride with the others on this one, hanger slightly bent...the park tool hanger tool was one of the best investments I've made over my years of fixing wrecked bikes...easily get your money back on it...

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BudLeach
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Re: Derailler frustrations
Reply #7 - 08/23/18 at 4:10pm
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traildog wrote on 08/23/18 at 2:39pm:


Can't check a derailleur hanger by looking at it. Gotta have the tool to align it with the rear wheel.


+1
  
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MrFixit74
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Re: Derailler frustrations
Reply #8 - 08/23/18 at 9:20pm
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Yeah, i was just hoping i was missing something simple. I'll be headed to my LBS tomorrow. Thanks guys
  
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