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Old 06-24-11, 08:08 PM   #1
veronicak5678
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What Happened to my Gears?

I have a Giant mountain bike that I use to get to and from work. Today I got on my bike, on the highest gear like I always have it, and it seems like it is much lower. I need to pedal so fast to get any resistance. The chain looks like it's on as always, and it shifts, but the lower gears are so ridiculous now I can't even move my legs that fast. How could this have happened? How do I fix it?
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Old 06-24-11, 08:17 PM   #2
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1. Start going up hill. You will feel like you are running out of gears again.
2. Tighten your brakes to the point they rub a bit. That'll create drag and thus make it harder.

Just kidding. The front ring, is it on the big ring or the little ring? On the back big=easier. On the front small=easier.
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Old 06-24-11, 08:54 PM   #3
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I'll agree with Abdon- it sounds like the front shifter has moved the chain to the small chainring.

If you always leave your bike in its "highest" gear, you're not riding it efficiently and you're wearing out parts in the drivetrain instead of sharing the duties among all the gears. You should either learn to use your gears or change to a dedicated single-speed bike.
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Old 06-25-11, 11:23 AM   #4
veronicak5678
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Thanks for answering, and please bear with me. I know nothing about bikes.
The chain is on the smallest ring in the front.When I move it to the largest, it hits the side of the metal piece that it runs through behind the rings. Could that piece be bent?
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Old 06-25-11, 11:40 AM   #5
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Any chance of some pictures?
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Old 06-25-11, 12:13 PM   #6
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Quote:
Originally Posted by veronicak5678 View Post
Thanks for answering, and please bear with me. I know nothing about bikes.
The chain is on the smallest ring in the front.When I move it to the largest, it hits the side of the metal piece that it runs through behind the rings. Could that piece be bent?
The small ring in the front is the lowest (easiest) gear. It has been shifted into low gear. That's why it feels like it does.
Are there two or three rings in the front? If there are three, while pedaling gently shift it to the middle one.
as you shift the rear gears the angle of the chain changes. This may be rubbing because the chain is in the large gears in the back and the large gear in the front. The bike really does not work properly in that combination. Shift to a smaller gear in the back may fix the chain rubbing. The big ring in front is only for going down hill or very fast.
It probably is not bent, but without photos or more info about the bike manufacturer and model name it's hard to get a really accurate answer.
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Old 07-01-11, 09:05 AM   #7
kenny213
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Quote:
Originally Posted by veronicak5678 View Post
Thanks for answering, and please bear with me. I know nothing about bikes.
The chain is on the smallest ring in the front.When I move it to the largest, it hits the side of the metal piece that it runs through behind the rings. Could that piece be bent?
Try playing around with the screws on your front derailleurs(screw in/out). It should move around the plate things that maneuvers the chains up/down. This is one thing I remember from a bike coop wrenching class I took a week ago.
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Old 07-01-11, 02:41 PM   #8
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Don't mess with the limit screws. They control how far out or in the front der moves. Once set they shouldn't have to be touched.
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Old 07-01-11, 02:52 PM   #9
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Don't mess with the limit screws. They control how far out or in the front der moves. Once set they shouldn't have to be touched.
But if the cable has stretched? Or the front derailleur has move round the seat tube a bit?

Veronicak5678:
1. check that the front deraileur cage (hereinafter fdc) is still parallel with the chain
2. If it is, try and move the fdc changer to 2 or 3 on the indicator, or to H if it is simplymarked L or H
3. If it moves, but doesn't move far enough to shift chain (get someone to lift rar of bike while doing this, so that the chain and the fdc run normally), then look for the two screws (as previous forumer said) on top of fdc mechanism). One should be marked H and t'other marked L.
4. Unscrew the one marked H a quarter of a turn at a time and try the fdc changer each time until the chain moves onto the next largest ring

This should do it.

If these instructions aren't as clear as they should be, go to http://www.sheldonbrown.com/derailer...ent.html#front for teh sacred text on how to do it.

Good luck
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