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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 06-06-10, 07:32 PM   #1
Unreasonable
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Bike won't shift from 1st to 2nd, will shift into 2nd when I tell it to go to 3rd

Hey guys. This is my first post here, and I only recently bought my first bicycle so you'll have to forgive me for using really "immature" terms for this question. Unfortunately, I don't really know what to search for to see if this question's been answered before.

I was out riding my mountain bike today like I have been for the past few days and was heading home. On the way home, I have to go up a pretty big hill. So as I'm slowly heading up it I shift down to 1st from 2nd (the "big" gears) and all seems well. However, as I hit a flat part I try to shift it back up into 2nd and I noticed that it didn't seem like anything changed. Up a hill again, I shift down to 1st and I notice it feels just a bit weird, like nothing's happening.

Once I get home I hold my back wheel up (don't have a bike stand or anything) and start spinning the pedal, shifting up from 1 to 2. The... uhh, thing that moves when you shift to guide the chain moves fine. But the chain doesn't move onto the next ring. I shift it into 3rd, and the guide moves again, this time the chain moves but only onto the second ring, like it should if I had only put it in 2nd.

I just bought it and the LBS I got it from gives me a year warranty, so I'll be bringing it to them on Tuesday. But in the meantime I was hoping you guys could give me anything I could check to be a simple fix so that I can ride it tomorrow easily (I've been trying to ride an hour a day - lose weight).

Thanks for any help or past threads you can give me.

Rob
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Old 06-06-10, 08:02 PM   #2
ultraman6970
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A lose shifting cable ?
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Old 06-06-10, 08:40 PM   #3
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Yeah, gonna say 'loose cable' as well. You can test it yourself- pedal the bike and pull the triggers or twist the grips into what I'm guessing will be 1/1- your smallest gears. Then reach under the downtube of your bike and pluck the cable on the left side- you'll probably find it to be a little on the floppy side.

Its ok, it happens with newly-built bikes. Your break-in tuneup should fix it.
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Old 06-06-10, 08:40 PM   #4
kycycler
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If this is a new bike the cables probably have come a little loose. That it back where you bought it and ask them to readjust. That is assuming you bought the bike from a local bike shop and not a big box store.
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Old 06-06-10, 09:08 PM   #5
jwa
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http://sheldonbrown.com/derailer-adjustment.html

Read through the whole article. Then re-read step 3: Indexing adjustment with the barrel adjuster.

And keep your date w/ the LBS - politely ask to watch while they address the problem, if you haven't fixed it yourself.
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Old 06-06-10, 09:30 PM   #6
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Front derailer or cable tension needs adjusting.
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Old 06-06-10, 09:41 PM   #7
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Thanks guys. I'll be bringing it to the LBS Tuesday and I'll see what they do to fix it. Good to hear it's just normal break-in.
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