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Mountain bike issues.

Discussion in 'Sports & Hobbies' started by JCtheOtherOne, May 22, 2020 at 6:39 PM.

  1. May 22, 2020 at 6:39 PM
    #1
    JCtheOtherOne

    JCtheOtherOne [OP] New Member

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    Who knows mountain bikes? As i pedal on the bike everything seems fine. But once i stop pedaling or it’s moving too fast and i don’t pedal with it, the derailleur just straightens our and the top of the chain goes slack. Kind of like what i am doing in this picture. Then it has no tension until i pedal to remove the slack off the top of chain.

    C7CF8260-0582-42F8-B515-2FA08ACEB9B3.jpg
     
    Mnorris1206 likes this.
  2. May 22, 2020 at 7:02 PM
    #2
    Mnorris1206

    Mnorris1206 Super white is fast as f***

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    I'm no expert on bikes at all but in the past on bikes I have owned it was that the gear selector was not adjusted right so basically the derailleur was slightly not in line with the gears
     
    Last edited: May 22, 2020 at 7:08 PM
  3. May 22, 2020 at 7:02 PM
    #3
    Mnorris1206

    Mnorris1206 Super white is fast as f***

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    If this even makes sense :rofl:
     
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  4. May 22, 2020 at 7:11 PM
    #4
    Wallygator

    Wallygator New Member

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    Can't really tell but is your chain lubed properly...it kind of looks like the chain is rusty, this could cause binding. Also the derailleur springs wear out after some years. When you pedal it is putting pressure on the chain to pull the derailleur arm back into position. An as mentioned your derailleur could be "out of tune". Look at the derailleur/chain/sprocket alignment from the back of the bike. If it is out of alignment you can use the two screws on the derailleur to adjust it left or right. An finally, if your derailleur hanger is bent then you need to take the derailleur off the bike and straighten it. Thats all I can think of. Good luck
     
    Last edited: May 22, 2020 at 7:17 PM
  5. May 22, 2020 at 7:26 PM
    #5
    Skey44

    Skey44 Less new member

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    Sounds like you’re having an issue with your free-hub which is part of the wheel.
    The screws on the back of the derailleur are not for adjustment they are limit setting screws. The adjustment is achieved through cable tension which happens at the barrel adjusters. Your issue doesn’t necessarily sound like an adjustment issue to me though since it is occurring when you’re coasting and not under torque.
     
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  6. May 22, 2020 at 7:33 PM
    #6
    Wallygator

    Wallygator New Member

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    That's right...thanks for setting me straight on the derailleur screws. It's been years since I messed with one. Now that I'm lazy I just take it in if it gets out of whack
     
    Last edited: May 22, 2020 at 8:02 PM
    Skey44 likes this.
  7. May 22, 2020 at 7:40 PM
    #7
    Jpneely

    Jpneely New Member

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    I second the free hub part. If it was stretching out while pedaling only, then chain or derailer would be a main concern, but what you described sounds like there's some rust or corrosion in there that needs to be dealt with. Spray the crap out if it with PB weld blaster and work the wheel until you lose that bind.
     
    Wallygator likes this.
  8. May 22, 2020 at 7:40 PM
    #8
    Cameron

    Cameron New Member

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    I am 95% sure it is what Wallygator has said. The freehub wouldn't make your chain and derailleur act like that. If the chain is not lubed correctly or is rusty, it will get caught and cause the whole drivetrain to act odd. A 9 speed chain will run you anywhere from 30-50 dollars at a bike shop and they should be able to throw it on for a few dollars extra.
    (Former bicycle shop manager for 7 years)
     
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  9. May 22, 2020 at 7:42 PM
    #9
    Cameron

    Cameron New Member

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    Also, don't ever use WD-40 on your chain.
     
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  10. May 22, 2020 at 7:54 PM
    #10
    JCtheOtherOne

    JCtheOtherOne [OP] New Member

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    Thanks guys. I was just outside playing with it and it seems the plastic dummy guard is loose and potentially getting jammed between the gear and the spokes causing the tension and the free wheel to not be so FREE. I don’t think i can fix that unless i remove the cassette? Maybe i will just snap off the dummy guard and see if that is the issue. If so, i can take it in for repair. I don’t go crazy mountain biking so i think i should be good. I also hit up the cassette with some WD40. Probably a bad idea... after reading the above.
     
    Cameron likes this.
  11. May 22, 2020 at 8:19 PM
    #11
    biebs96

    biebs96 -

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    Yup. Free hub or a seized link in the chain somewhere.
     
  12. May 22, 2020 at 8:24 PM
    #12
    Jpneely

    Jpneely New Member

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    but if its only happening when he's not pedaling, then the only piece that is interacting in regards to the derailleur are the free hub allowing the wheel to spin independently to the rear sprocket. a rusty chain shouldnt have any effect when its not in motion.

    EDIT: also dont agree with using WD-40 for lube.
     
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  13. May 22, 2020 at 8:29 PM
    #13
    Cameron

    Cameron New Member

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    Can you take the wheel off the bike and spin the cassette freely? That might eliminate the guessing part. The protective plastic ring is there in case your derailleur isn't adjusted properly or the limit screw is a little too loose. It protects the spokes in the wheel
     
  14. May 22, 2020 at 11:44 PM
    #14
    TXTundra2722

    TXTundra2722 Pipe Hitters Union

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    This sounds like you have your gears crossed up... meaning you can't have it on the big or top gear on the cassette(the rear gear) and at the same time have it on the big gear on the front gear(crank set). Basically you can't have it to the far left in the rear and the far right in the front... and vice versa. So you'll have to see where your chain is and what gears your in when this is happening. Im almost 100% sure what I mentioned is what's happening, based off your description. If you keep the front in the middle gear then you should be ok in the rear with any placement on the rear gear(cassette).
     
  15. May 23, 2020 at 5:23 AM
    #15
    myt1

    myt1 New Member

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    I think the issue is with the prawls on the inside of the hub.

    Inside of the hub there are little ramps that have little springs that allow the hub to rotate backwards properly. When the springs aren't cleaned or lubed correctly they will cause exactly the symptoms you describe.

    You have to remove the cassette and remove the hub. Be very careful because the springs are tiny and can be lost very easily.

    Every brand is different. I learned how to repair mine by going to Youtube. You also might need some specialized tools, at the very least a chain whip and a special lug to remove the cassette.

    For a bike shop this should be a piece of cake to fix.

    I hope this helps.
     
  16. May 23, 2020 at 5:45 AM
    #16
    RPS1030

    RPS1030 Which way to the rocks!?!

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    xWhatever on Freehub

    I actually had that occur on the pre-ride before a race way back when in GA. Freehub wouldn’t disengage when coasting and would run the chain over the top.

    It was a basic Shimano hub, so ended up just upgrading.
     
  17. May 24, 2020 at 4:37 AM
    #17
    JCtheOtherOne

    JCtheOtherOne [OP] New Member

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    Don’t think that is it because i have been riding on the 2nd gear up front.
     

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