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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 03-31-09, 05:41 PM   #1
WindTraveler
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What is wrong with my bike?

Today I was riding my bike and was messing around with the headset and spacers to adjust the height of my bike.

After, I tried every combo and decided to stick with the old configuration.

But problems start to show as when I try to "skid" at a fast speed, when I push the pedals back I would get this "empty feeling" as if my crankset is going backwards WITHOUT engaging chains!

The pedals would not engage the chain thus the rear tires are not moving backward, feels like only the crankset is moving backward.

This had happend twice today and I really dont know what is wrong with my bike.

I doubt the problem have anything to do with headset but what then?

This is a picture of my bike, I just bought it not long ago...



Thank you for helping me nub

Last edited by WindTraveler; 03-31-09 at 06:12 PM.
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Old 03-31-09, 05:47 PM   #2
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Are you sure you aren't using a singlespeed cog instead of a fixed or track cog?

If you are rolling down the street, the rear wheel is moving.

Is the lockring missing or loose? If so, the cog could be unscrewing itself and that would be disastrous, even deadly.

Oh, you need to take pictures of your bike. Don't post stock photos. Unless you bought the bike that was in that photo. A very important part of being in the BF community is the sharing of lots of pics of your bike.

Otherwise, it didn't happen.
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Old 03-31-09, 05:48 PM   #3
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edit:^ better answer
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Old 03-31-09, 06:02 PM   #4
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Originally Posted by WindTraveler View Post
the rear tires are not moving
sounds like youre doing it right then ;D


jkjk

the chain might be slipping. are you sure you have the right amount of tension? it happened to me when i got a larger cog before i could get a bigger chain, and its obvious that it can happen if the chain is too lose
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Old 03-31-09, 06:08 PM   #5
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Chain tension can do that to you. Check that out first, just give the chain a bit of a vertical tap, and if it gives more than a cm or so, move the rear wheel back in the dropouts (or track ends, if Sheldon is actually right) to tighten the chain
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Old 03-31-09, 06:12 PM   #6
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Originally Posted by homEsick View Post
sounds like youre doing it right then ;D


jkjk

the chain might be slipping. are you sure you have the right amount of tension? it happened to me when i got a larger cog before i could get a bigger chain, and its obvious that it can happen if the chain is too lose
Sorry, I ment to say its not moving backward enough to skid, in fact, its not engaging the chain/rear cog. When this problem occurs, my skidding is not even doing a thing to the speed of the bike. I feel like its moving at the same speed.

Even my little tension pushing pedals backward is having a dramatic decrease in speed, whereas this "empty skid" does absolutely nothing to decrease my speed.
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Old 03-31-09, 06:18 PM   #7
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i dont know what youre talking about when you say "it"

if the problem is that your chain is slipping can you tell if its the cog or the chainring(<-which seems unlikely) thats not catching?

and when you say a little tension, do you mean when you use reverse pressure as in backpedaling?

one last thing, does it only happen at just the beginning then catches or is the wheel just still spinning while the pedals are locked?

can you take an actual picture of your bike? everyone would be able to help a lot easier then - particularly your chain
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Old 03-31-09, 06:29 PM   #8
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i dont know what youre talking about when you say "it"

if the problem is that your chain is slipping can you tell if its the cog or the chainring(<-which seems unlikely) thats not catching?

and when you say a little tension, do you mean when you use reverse pressure as in backpedaling?

one last thing, does it only happen at just the beginning then catches or is the wheel just still spinning while the pedals are locked?

can you take an actual picture of your bike? everyone would be able to help a lot easier then - particularly your chain

Yes, I do mean reverse pedaling. And when the problem happen the wheel is still spinning while the pedals are locked.

And from various people mentioning about my chain tension, this is the current state of my chain tension.

My chain line is straight

From the centre of my chain (top half and bottom half) I am able to push inward 1cm when applied pressure. Is this normal or lose?

Last edited by WindTraveler; 03-31-09 at 06:33 PM.
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Old 03-31-09, 07:56 PM   #9
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PICS. My money is on lockring. If you are still able to pedal your bike forward, then most likely your cog is becoming unscrewed as you pedal backwards due to a missing or loose lockring. Tighten your lockring and post pics of your rear cog/lockring/hub. If your chain is on, and your chainring is tight, the ONLY thing that could be wrong is basically the lockring or some other part of the rear drivetrain

EDIT: Also, usually when you buy a new bike you need to re-tighten the lockring after you ride it a bit
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Old 03-31-09, 08:46 PM   #10
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i agree with the freewheel guess.
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Old 03-31-09, 08:47 PM   #11
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+1 for loose or missing lock ring
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Old 03-31-09, 09:05 PM   #12
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I'm guessing freewheel. If his lockring was a bit loose so that it would allow the cog to unthread a little bit but not all the way, it seems like after just a moment the cog would unscrew enough to engage the lockring and the drivetrain would lock up again. From the sound of the OP, it seems like he's able to coast/backpedal way longer than it would take for the rotation of the wheel to unscrew the cog.

On the other hand, if his cog was unscrewing all the way from the hub, wouldn't he then be unable to pedal the bike after it had screwed all the way off? Granted, I can't say I've experienced either of those conditions because I like to be sure that my equipment is safe to ride on, it just seems like that's what would happen in either case. Correct me if I'm wrong.
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Old 03-31-09, 09:05 PM   #13
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yeah. check your rear hub/cog/lock ring.
it is most likely loose.
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