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Old 06-15-07, 01:42 PM   #1
Fivecoolcats
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Warped front crankset? Help!

Is my front crank warped....???

No matter what ring I am in I get chain rub on the front deraileur>>>BUT only on the down/power stroke with my right leg. If I pedal or apply pressure only with my left leg the chain does not rub. I tried to watch the big ring alignment while I am mounted and riding the bike, and without crashing head long into a tree it appears that the rings are drifting left to right. I Don't have a stand and I can't get it to happen if everything isn't under load.....its a fairly new bike, 300 kms? and has never been beaten or bashed......any thing need to be torqued??? before I get hosed by my LBS looking for some advice...

Thx
T
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Old 06-15-07, 02:03 PM   #2
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You really need to check it not under load. Just get off the bike and spin the cranks backwards. You can watch from lots of angles this way. If it doesn't appear warped, you have too much flex somewhere.

Another possibility is that the BB is loose. Try grabbing the crankarms and wiggling them to see if there is any play.

The bike is new. Did the sale come with a first service/adjustments included?
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Old 06-15-07, 06:36 PM   #3
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ya it came with service....and these guys owe me bigtime.....but another LBS installed the pedlas crossthreaded and they broke off on my first ride....the guy didn't want to warranty them.....I argued for about an hour before he would put a new crank on...jerk


ya the wierd thing is...under load spun backwards ...ZERO PLAY......its a splinned (sp?) axle...so I thought it would prevent any play...
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Old 06-15-07, 07:40 PM   #4
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it seems to me that the shop that installed the pedals incorrectly should be the ones to pay for the damage
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Old 06-15-07, 08:03 PM   #5
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Quote:
Originally Posted by MyBikeGotStolen
it seems to me that the shop that installed the pedals incorrectly should be the ones to pay for the damage
You would think so...the guy said.."My guys wouldn't have put it together wrong" sure that 15 yr old kidz you have working for you have yrs of experieince....(don't write me letters I am sure there are some amazing young bike techs out there).

As it turns out I solved my rubbing problem tonight....my left crank wasn't even finger tight...I cranked it down and rubbing is gone....

thx for the ideas
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