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Advice on wobbly chainring

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beaglepopper:
That was a little bit foreign for me  :idiot2: Im new to the building game & i fitted my crank from a video tutorial & guide on here.

I have a mongoose OPC.

Sugino chainring & spider.

The spider bolts look to be sitting flush, i have also fitted a spacer between the chainwheel & arm.

The crank spins free and smooth so apart from the slight wobble it seems ok.

Im thinking, i may have damaged a bearing cup when putting them in, maybe  :-\ Im guessing that could cause a slight fluctuation?

moley:
If your using a 1pc crank then make sure your Retaining nut Race is nice and tight.

Sometimes it is hard to get a spanner inbetween the nut and spider to tighten it up properly.

Check your alignment of your chainwheel to the freewheel.   Stand behind the freewheel and look along the line of the cogs toward the chainwheel.  Because you are using spacer (why?) the alignment of the two cogs might be out of whack and cause some strain on the chainwheel.

Use a straight rule (a piece of wood) or use your eye to look along it.  If its in line then that is not your problem!!

You should always try and align the two cogs to give the chain the smoothest movement between the two.   If the Chainwheel isn't in line then the chain will be constantly rubbing against one side of the chainwheel and the opposite side of the freewheel due to the diagonal movement of the chain.  This could also put undue strain on the chainwheel if its way out of true!!

Check the alignment and see if your spacer is the problem.   

If your parts are used then you chainring might be out of whack or a tooth might be bent.   Take it off and place on a flat surface and see if its flat.  Look down the teeth and see if a tooth is bent.

Post some piccys?

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