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.

the same thing happens to me....i wondered the same thing...

try moving your sprocket on your crankarm. if that doesnt work, take it off, and check to see if it is straight.

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

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.

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.

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

maybie thats why i cant get the full rotation

maybe................

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.

stretched chain? that was the problem when mine did that.

It's off center.

shut up

[edited by moderator] you talking to me, yeh you wanna start something, again.

don't even start you jerk, you are just going to make yourself look like more of an idiot

Do you think I care. Oh use soem better grammer thanks.

"soem"?

Grammar!

hukt on fonix werkd foure me, i grajuated.

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.

Yeh sweeping floors, um not. I'm the guy who sells and does the repairs [edited by moderator].

Do you wanna go, I'll start.

hey queens you were right...this new kid needs to learn some lessons....

Sure. After school. Out by the flagpole. Be there.

I dunno, I think he's doing just fine as the resident lol-cow. I really like how he wants to fight everyone here, that's a classic internet faux-pas that never gets old. As if. Next he's going to try to e-prove to everyone how he's not only tougher more experienced 'cause he works at a bike shop (thank god I do too so I don't have to shop there), but he can do more tricks than all of us.