Out of round chainring?
11-09-05, 06:47 PM
#1
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My chain goes from snug to very tight as I turn the cranks. I'm not sure if it's the chainrign or the sprocket. I didn't look all that close. But I think I'm going to upgrade both. Is it unusual to have the chain get a litte tighter when turning the crank? I had a VERY bad accident years ago when my chain came off. So I'm a little loony about keeping it snug.
Last edited by Darin; 11-09-05 at 06:53 PM.
11-09-05, 06:51 PM
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try moving your sprocket on your crankarm. if that doesnt work, take it off, and check to see if it is straight.
11-09-05, 06:52 PM
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same thing happened to me with an FBM sprocket. somehow it became oval. it wasnt twisted to the sides at all, just oval. i thought it was pretty weird. same may have happened to you
11-09-05, 08:20 PM
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Your sprocket is probably not centered on your chainring. Take it off, clean it, check for runout. You must have chicken legs. When my sprocket was off center, I broke a chain racing. 
11-09-05, 09:01 PM
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Originally Posted by Darin
My chain goes from snug to very tight as I turn the cranks. I'm not sure if it's the chainrign or the sprocket. I didn't look all that close. But I think I'm going to upgrade both. Is it unusual to have the chain get a litte tighter when turning the crank? I had a VERY bad accident years ago when my chain came off. So I'm a little loony about keeping it snug.
i have the same fear. im sure your accident was a hell of a lot worse but i know what yo're talkin about. i was screwin around on my haro f5 and i switched the gearing to 39/12 and i got it topped out and the chain snapped and i went for a ride. now that i run 25/9 gearing and i constantly worry my chain is going to snap. not to mention i keep my chian so tight u cant bend it and i can already see the wear on my sprocket and driver.
11-09-05, 09:14 PM
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you will be fine. my sprocket bolt got loose, and the 19mm adapter was grinded away from it being loose. i had my chain loose for kickflips, and my sprocket would shake, and my chain never popped off
11-09-05, 09:26 PM
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Originally Posted by queensrider86
i had my chain loose for kickflips
11-11-05, 12:50 AM
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It's pretty common for BMX sprockets to be out of round because a lot of 'em are either cheaply made or they're made by small companies that don't have the means to machine them accurately. Turn your bike sideways. Turn your cranks all the way around a couple turns. Does the chain fall off? If no, then you're good, you can stop stressing. Your chain should *not* be super tight, only enough tension to keep from falling off using the above test. Tight chains wear cogs and sprockets and stretch out a LOT faster. Worn drivetrains = dropped chains, chain skip, horrendous crashes.
11-12-05, 07:05 AM
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It's off center.
11-12-05, 08:52 AM
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Originally Posted by queensrider86
shut up
[edited by moderator] you talking to me, yeh you wanna start something, again.
11-12-05, 08:54 AM
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don't even start you jerk, you are just going to make yourself look like more of an idiot
11-12-05, 08:57 AM
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Originally Posted by queensrider86
don't even start you jerk, you are just going to make yourself look like more of an idiot
11-12-05, 01:55 PM
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Grammar!
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11-12-05, 02:23 PM
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hukt on fonix werkd foure me, i grajuated.
11-12-05, 02:48 PM
#20
"Uh-uh. Respek Knuckles."
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Originally Posted by racersk66
It's off center.
11-12-05, 04:16 PM
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Originally Posted by hypersnazz
Great assessment there, Sheldon Brown! Didn't you say you worked at a bike shop? Sweeping the floors, sticking price stickers and breaking down cardboard? There are some lurking around that know their way around a bike, but YOU should leave the mechanical advice up to actual mechanics.
11-12-05, 04:17 PM
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Originally Posted by hypersnazz
Great assessment there, Sheldon Brown! Didn't you say you worked at a bike shop? Sweeping the floors, sticking price stickers and breaking down cardboard? There are some lurking around that know their way around a bike, but YOU should leave the mechanical advice up to actual mechanics.
11-12-05, 05:15 PM
#23
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Originally Posted by racersk66
*** you talking to me, yeh you wanna start something, again.
11-12-05, 08:27 PM
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"Uh-uh. Respek Knuckles."
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Originally Posted by racersk66
Do you wanna go, I'll start.
11-12-05, 10:37 PM
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"Uh-uh. Respek Knuckles."
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Originally Posted by KinetikBiker04
hey queens you were right...this new kid needs to learn some lessons....