Bicycle Mechanics - Doesn't want to stay in one gear
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06-24-10, 09:39 PM
Hey hoping you guys could help me here, i got a 09 Kona Blast all stock except for Kenda Nevgals all around. I got this bike a little over a year ago, and its been pretty much trouble free. I don't have a ton of time on it... My problem just started recently. I was messing around in my driveway waiting to load up my bike and bring it to my moms when i noticed it didn't want to stay in the middle gears out back. I didn't think much of it. Few days later went to ride found my chain off my derailer (sp?) and so i pulled it apart to get the chain back on by unscrewing the 2 bolts that go thru the 2 small sprokets in the derailer bolted it all back together fine. and so i'm going thru the gears and it can't rest on any one, its as if its half shifting i've tried adjusting cable tension and i think pre load on my derailer but not 100%, any help would be greatly apprecieated bit of a noob as far as wrenching on bikes go....
06-24-10, 09:48 PM
hanger is probably bent, and stop messing with the B-screw
Shift to the smallest gear, and release the cable. Then reattach the cable, pulling it tight. That should get you pretty close to where it needs to be. Then use the barrel to fine tune it.
06-24-10, 10:04 PM
nothing looks bent, but i'll post up a few pics....
and i'll try that cable trick, i'm gunna assume that the front's postion doesn't matter...
the chain is rubbin on the closes part there right as it enters the gear assembly
06-24-10, 10:23 PM
would a video be helpful, if so of me doing what???
06-25-10, 08:07 AM
If you thought you needed to take apart the "two small sprockets" (pulleys) to get the chain back on the derailleur you need someone in person, with hands on bike and knowledge in head, to determine where the problem lies and to let you know how it can be corrected. I can see the chain is rubbing on the pulley cage, should not happen. But that could be just the pulley assembly, the hanger being bent/twisted or the derailleur being twisted (more rare). Until things are properly aligned you cannot get a proper adjustment across all gears.
06-25-10, 08:16 AM
Lube that chain!
Oh, and visit www.parktool.com for info on how to set up a rear derailler. If the problem started out of nowhere, it's likely a cable tension issue. But if you've gone and messed with the stop screws, you'll likely need to do a complete reset of the derailler to get things working right again.
06-28-10, 08:39 AM
If you read this, once again the chain rubbing on the pulley cage is not normal - and it's not an adjustment issue. The more likely cause of something happening out of nowhere is the derailleur or hanger being bent. If you try to just adjust it and then happen to shift to a gear combination where the derailleur alignment is worst you could create a more serious problem. I'm all for people maintaining their own bikes - our bike co-op ran public clinics every week for years - but this is a case for a true mechanic.
p.s. Although it's hard with photos to see the relationship of the derailleur to the bike in the next to the last photo the pulley cage looks like it's leaning in quite a bit toward the spokes. It should be dead vertical, so again, get thee to a mechanic!
Dan The Man
06-28-10, 08:56 AM
You probably put the cage back together wrong somehow. Why you thought you needed to take it apart in the first place is a mystery. How could a chain possibly have passed through a solid piece of aluminum simply sitting in your garage? If it was running through the cage fine to begin with, and then the chain fell off the cassette, it is still running fine through the cage. Just put the chain back on the cassette
I'd look at the hanger. All it takes is a very small bend to do that. Usually pretty cheap to fix.
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