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Old 10-23-05, 02:26 PM   #1
cd14
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FSA SLK MegaEXO Installation Problem

Hello, has anyone installed a integrated BB/crank such as the FSA SLK MegaEXO and have bearing binding/roughness? I had a local shop install a set and when he tightens it the problem occurs. The only way to get it to move smoothly is to back off a tad, but he says that's not normal. I've never installed this type so, I'm not sure. I also noticed he had to hammer the drive side through the BB in order to get it through...don't know if that's normal either. Any help would be appreciated.
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Old 10-23-05, 02:31 PM   #2
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my .02 is that the bottom bracket needs to be faced. If the sides aren't parallel and true the bearings wouldn't be aligned properly. This could also result in a very short bearing life. I would think that any bike mechanic would know this however...

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Old 10-23-05, 05:57 PM   #3
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If by "back off a tad" you mean "loosen the crank bolt a tad," then I think you're headed for trouble. The bolt that holds the left crankarm on should be tightened to spec and left there since it should have nothing to do with bearing adjustment.

The set on my road bike is chronically a bit loose, and I haven't gotten around to fiddling with it to see about tightening it up. All in all, I'm not thrilled with the design, but maybe someone else has some experience to share about adjusting those bearings.
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Old 10-23-05, 07:21 PM   #4
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I agree with Mentor. Go get the BB shell faced.
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Old 10-24-05, 09:05 AM   #5
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Originally Posted by fmw
I agree with Mentor. Go get the BB shell faced.
I second that, get both sides faced though. MegaExo has two cups that have to be perpendicular to the center line of the crank to function smoothly. Good luck. It shouldn't cost too much and it's a one time deal.


Tim
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Old 10-24-05, 06:46 PM   #6
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Mega Exo relies on rubber coated "crush washers" to help take up variations in bottom bracket shell width. These washers tend to deform over time which releases tension on the end crank arm bolt. For that reason I like Shimano's pinch bolt crank arm attachment method better; bolts will not come loose.
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Old 10-24-05, 10:11 PM   #7
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Thanks for your help guys. I appreciated it.
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