I just bought a new Gary Fisher Wahoo. I realize the drive train components are only marginal, at best. So far, the bike shifts smoothly and I love the fit and the ride, etc. However, when in the largest front gear ("3") and in 6, 7, 8 of the rear cassette the chain rubs on the side if the front derailleur. This rub only occurs when I apply pressure to the pedals (example, stomping on it going up hill). What is happening is that the cranks (along with the gear unit) seems to be flexing under power. So, while on the bike stand.. no rub occurs I took it back to the LBS where I purchased it and they told me that the crank flex is normal (despite the fact that they couldn't adjust the front derailleur to the point where the rubbing stops. So my questions are.....
1. Is it indeed normal for the crank to flex to the point where chain clearance isn't met in all gear combinations? (I can visually see that the gear unit does not remain parrell to the frame when i put pressure on the pedal (it moves perhaps a few mms ). The "slop" seems to be in the bottom bracket (all nuts, etc are tight). The bike has the stock Shimano MC09 (ie, cheapo) (not sure what kind of bottom braket it is). Would upgrading to a better crank set solve the problem (which seems silly.. since the current one is brand new).
2. The front derailleur is a cheapo (Shimano Acera). Would a better quality front derailleur allow for better clearance/more adjustment? I wouldn't mind replacing the Acera for a better one, regardless..
3. Has anybody else experienced this with their bikes of similar quailty?
Thanks so much!
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Thread: Gary Fisher crank flex