Singlespeed & Fixed Gear - what the hell is with my bike?
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09-30-04, 01:33 AM
sigh. please for the love of god fix my bike. i thought fixies were supposed to be no fuss. i fuss with this bike all the goddamn time and then when i get one thing perfect its something else. now it is the worst ever to the point where i feel something is really wrong but i cant tell what. it used to be a little bird creak that id get under load. now after messing with the chainring and cranks and pedals there is something new thats even more disconcerting: a weird regular swishing noise like a tire rubbing (but its not that!) plus an odd 'wiggle' or 'shudder' or 'waver' that goes briefly through the crankarms (i thnk both of them) that feels like i am going over slight little smooth road bumps. its so slight that sometimes i think im crazy and the roads here are bad enough its really hard to tell. its not quite a vibration more of a sudden 'wonk' and then gone again and it doesnt seem to come back with every pedal stroke. am i insane? i cant see it happening when the bike is in the stand. it does not make noise when i spin the cranks with the chain off (so its not the bb?). i have tried getting some speed, putting my feet up and coasting with my head down as low as i can get it w/o crashing and the swishing noise remains but i have no clue where its coming from. one of my stackbolts is stripped (but seems tight enough) and other than than i have no idea what is wrong. oh except for my wierd french bb shell situation but it has been fine for quite a while why would it get so much worse all of a sudden without me even touching it?? aaaargh! its like the more i worry about my bike the more it gives me to worry about.
09-30-04, 01:35 AM
ps - i didnt mention anything wheel related because my wheels have perfect brand new phil woods. otherwise i wouldve guessed it was a broken axle or something. blah.
09-30-04, 01:36 AM
Pray and ride, just pray and ride.
09-30-04, 06:43 AM
You say it's not really a vibrating sound though I would still be inclined to say chain binding or chain flutter. The low rumbling sounds like BB problems. What construction is your BB (cartridge, sealed, or cup&cone)? If taking the rest of the drivetrain apart (even taking the cranks off) and putting it back together doesn't help, then I would look at your BB.
I suppose you could proceed to the top of a small hill, remove the chain and coast down (be sure you have a brake or can employ your hands or feet to stop, obviously) and see if you get the noise when not pedaling.
The advice above is good too. Try to figure out what the triggers are.
Oh, and low maintenance...Sure, sometimes. Sometimes you spend all your spare time diddling. See, you have nothing that soaks up the imperfections, no derailleurs, no tensioners, nothing. So you feel it all. Now you're questing for perfection. But once you get that perfect setup and everything's dialed in, you can ride that for months before you need to touch it.
09-30-04, 10:56 AM
"I suppose you could proceed to the top of a small hill, remove the chain and coast down (be sure you have a brake or can employ your hands or feet to stop, obviously) and see if you get the noise when not pedaling."
very good idea!
Don't know about the sound but if the "wonk" you feel occurs in both crank arms, i would check to make sure:
a) the bottom bracket is good and snug in the shell
b) both cranks arms are securely on the spindle
I had a swishing noise on my bike recently. It was driving me crazy, until I found out the rear wheel was ever so slightly rubbing against the frame when I was riding. Problem fixed with that one! Have you checked every part of the wheel? Maybe when you're sitting on the bike, the weight causes the tire to rub but it's not apparent when it's on the stand, since there's no weight on the frame when it's on the stand?
For the crankarms, when was the last time you changed the ball bearings? Do you think it could be time to change them out? Have you greased up the bottom bracket? Could that be the problem?
Just some conjecture and speculation for you to consider.
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