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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 04-01-09, 02:38 PM   #1
Zero Nero
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All new parts, just assmbled, slight side2side wobble in chainring!!

Ohh say it ain't so.

Last night I had it all put together: my bottom bracket and cranks and as I spun the cranks and watched them I don't believe I noticed any side to side wobble.

Today I took the cranks off (to fiddle a bit with the bottom bracket set up) set the cranks on the spindle, tightened the crankbolt and there it was! A side to side wobble. Normally this wouldn't bother me too too bad, but as it is there is only about a millimeter of clearance between the chainstay and the underside of the spider right where the chainring bolts go. Sigh.

What could possibly account for this wobble? If it were a used bike I would wonder if my chainring was bent, but that's just not possible here...

...help?
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Old 04-01-09, 03:14 PM   #2
Scratcher33
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Have you tried unscrewing re-tightening you chainring bolts?
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Old 04-01-09, 03:27 PM   #3
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what bottom bracket is it? recenter the ring.
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Old 04-01-09, 03:35 PM   #4
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Quote:
Originally Posted by Zero Nero View Post
Ohh say it ain't so.

Last night I had it all put together: my bottom bracket and cranks and as I spun the cranks and watched them I don't believe I noticed any side to side wobble.

Today I took the cranks off (to fiddle a bit with the bottom bracket set up) set the cranks on the spindle, tightened the crankbolt and there it was! A side to side wobble. Normally this wouldn't bother me too too bad, but as it is there is only about a millimeter of clearance between the chainstay and the underside of the spider right where the chainring bolts go. Sigh.

What could possibly account for this wobble? If it were a used bike I would wonder if my chainring was bent, but that's just not possible here...

...help?
Firstly, this isn't a SSFG specific problem. You will likely get a better solution from the Mechanics sub-forum. They are pretty responsive over there.

Secondly, try to isolate the problem with unit testing. Take the ring off and place it on a flat surface to see if it will lay down completely flat on both sides. If it doesn't, that's your problem. If it does, then the problem could be with the BB spindle being bent or the crank arm being bent.

To test the crank arm, try placing the spider (without the ring on) on a flat surface and test that. If it rocks like a table with one shorter leg, then that's your problem. If not, maybe the BB spindle.
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