I think my crankset is pulled from the bottom bracket on my bike?

Question

when i move the pedals on my bike the chainring wobbles moveing in then away from the bike the chainring itself isnt bent its i think its pulled from the bottom bracket

if i look at where the crank ( arm of the pedal) for my bike meets the bottom bracket (center where both cranks meet) of the bike the crank is slightly pulled out

any help i hear using a rubber mallet can help

Answer 1

Maybe the crank axle is bent.  Or a bearing collapsed, or the bottom bracket is trashed.  Grab a crank arm and try to pull it away from the bike, there should be no loosness. Are you sure the chainrings are not bent?  A slight wobble of 1/8 inch or so is OK.  Using force is not the answer.  I'd end up taking it apart and looking for damaged bearing races, a crushed bearing, or a loose cup.

Answer 2

This has happened to me twice.  If the bike is new, just take it to the shop where you bought it and they should take care of it.  If it isnt new, you can fix it.  There should be an allen s***w on the side pof the crank arm(it holds the crank to the bottom bracket).  Tighten the s***w and the crank should move in and tighten up against the bottom bracket.  I would suggest putting a dab of threadlocker on the s***w.  If the cranks are "welded" ther will only be one s***w and it will be on the non-drive side.  If your crank have this, just tighten the sllen s***w on the non drive side carefully.  I would not use a rubber mallet, but if worse comes to worst use it gently