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Problem with bike

Old 06-10-07, 12:36 PM
  #1  
supra25
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Problem with bike

alrighty guys, ive held out on writing this thread for awhile now but i am starting to get all worked up...every time i ride, my chain skips. so i take it to the lbs. they say my derailers were out a wack. i take it out again, starts out good, then all of a sudden starts skipping...so i say whatever and take it back in. again they say its out of wack. then i go out AGGGGGGGAIIIINNN and low and behold my chain is skipping...i have 2 quesions...1.) is there a way you guys could tell me how to adjust so i dont have to haul it to the bike shop between rides, and 2.) do the derailers that come with the 2007 specialized rockhopper disc work like crap? is my problem just the fact that they arent top of the line??? if so what derailers are nice because im ready to solve this problem...
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Old 06-10-07, 01:36 PM
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Check for kinks or tight links in the chain also.
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Old 06-10-07, 01:44 PM
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Are you talking about unwanted shifting, or actual chain skipping where the chain jumps forwards? Skipping can occur due to cross chaining, where you use the small front and rear sprockets at the same time. The few teeth on the rear sprocket can't hold the chain when the high torque of the small front sprocket is applied, combined with the lateral pull of the chain going from inside to outside sprockets.
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Old 06-10-07, 02:29 PM
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Derailleur hanger might be bent.
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Old 06-10-07, 02:55 PM
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Is the cable tensioned properly?
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Old 06-10-07, 06:37 PM
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As you can see from these posts there can be many reasons for chain skipping. I hear the most common is a worn chain or chainrings but that doesn't seem likely as your bike is fairly new-still, I would check for broken or bent teeth and examine my chain for wear. Maybe the problem is your mechanic. Take it to another shop-get a second opinion-and/or pick up a copy of 'zinn and the art of mountain bike maintenance' or the park tool big blue book, or some other repair manual and take a look yourself.

I have heard from many sources that the price of your derailleur is generally not as important as it being adjusted properly. There are expensive derailleurs out there that suck just as there are cheap ones that work perfectly and last forever because the person that owns them keeps them in adjustment and cleans/lubricates them regularly.
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Old 06-10-07, 07:09 PM
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The above are pretty much right on, but if it really is your derailer, you probably can fix it with the barrel adjuster.

Just put your bike on a stand/upside down and pedal it while shifting. Turn the barrel adjuster until it stops skipping. If turning it one way doesn't work, turn it the other way.

If that doesn't do it, it's not your derailer, or the adjustments are going to be greater than the barrel adjuster allows, which means you need to start from scratch in setting it up, basically. Check out Park Tools and Sheldon Brown's site for all the how-to info you'll ever need.
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Old 06-10-07, 09:37 PM
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All of the above posts have good possibilities.
One other is in making sure your chain is clean and lubed as well.
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Old 06-10-07, 09:52 PM
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After having chain skipping along with the countless tries of meddling with it, I purchased a new one, installed it, and the bike seemed to ride nice and smooth, free of skipping. Check your chain first like said, then see if all is aligned with your rear mech, and see if adjusting the barrel on the shifter affects anything.
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Old 06-11-07, 05:18 AM
  #10  
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alright cool...thanks guys for the good advice, ill look into it and see what i need to do
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Old 06-11-07, 05:53 AM
  #11  
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check the cable...if its old replace it...sometimes a sticky cable can make it seem like its skipping.
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Old 06-11-07, 09:22 AM
  #12  
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does it skip in all gears? can you eyeball the deraillers and see if the chain isn't quite lined up? can you see any skipping when you pedal backwards with your hand? can you put the bike on a stand (or set it upside down) and pedal forward and look for skipping, you can use the rear brake to create resistance to pedal against also. When you kept taking it back to the LBS did they find anything wrong or do they just look at it and call it good and give it back?
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