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Shimano stuff on FSA SL-K MegaExo crank?

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Shimano stuff on FSA SL-K MegaExo crank?

Old 10-14-06, 09:33 AM
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Phatman
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Shimano stuff on FSA SL-K MegaExo crank?

hey, so I've got this FSA SL-K Megaexo crank. the bottom bracket wore out after about a month and a half, and the rings are awful, not shifting nearly as well as my shimano rings. I would just try to sell the crank, but as I've mentioned, its got a worn out bottom bracket, and due to my cleat position, some of the sticker on the crankarm is worn off. so basically I wont get any money for it. (if someone wants to buy my busted ass crank for ~160 USD or so, its yours)

But I'm looking to cut my losses. the crankarms themselves are fine, so I was wondering if anyone has used a dura ace external bottom bracket with an FSA crank.

I was also looking at getting a set of ultegra 10-speed rings to put on instead of the FSAs. is there any reason anyone can think of that would make this a bad idea?
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Old 10-15-06, 12:26 AM
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I can't answer your questions but I can confirm that the FSA MegaExo cranks seem to have a poor bottom bracket design. Those crush washers cause the bolts to loosen over time which leads to excess play and wear. The Shimano crank/BB is a superior design in my opinion.
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Old 10-21-06, 08:27 AM
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worn out in a month? and I thought they said these new external ones being much bigger and all,are supposed to last longer.I now have second thoughts about swaping my ISIS for one
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Old 10-21-06, 11:20 AM
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Originally Posted by brundle_fly
worn out in a month? and I thought they said these new external ones being much bigger and all,are supposed to last longer.I now have second thoughts about swaping my ISIS for one
dont do it man. Megaexo sucks.

BTW, I just asked a guy from the bike shop if the dura ace BB would work with the Megaexo crank. He says yes. I ordered it yesterday, I should have it installed in a week or so.
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Old 10-21-06, 12:16 PM
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I was going to go for the Shimano version,but from what I have seen and read it isn't a lot different from the Megaexo.The bottom bracket design looks identical,being just a set of cups with external cartridge bearings
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Old 10-21-06, 12:40 PM
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Originally Posted by brundle_fly
I was going to go for the Shimano version,but from what I have seen and read it isn't a lot different from the Megaexo.The bottom bracket design looks identical,being just a set of cups with external cartridge bearings
I just know that I have friends with tons of miles on their dura ace 10 speed cranks/BB, and I put ~1000 miles or so on my megaexo BB before it crapped out.
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Old 10-21-06, 03:08 PM
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The difference between the Shimano and FSA crank/bottom bracket assembly is more than it seems. Shimano uses two small pinch bolts to hold the left crank arm on and FSA uses a larger axial bolt and crush washers. The problem is that with time the crush washers on the FSA bottom bracket start to compress which releases torque on the left arm attachment bolt. If you ride with the crank arm bolt loose you can damage all sort of parts: crank arm, bottom bracket, etc.

The Shimano design is simpler and more durable. Putting a Shimano BB on a FSA crank doesn't solve the problem because the crush washers are still needed.
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Old 10-22-06, 07:24 AM
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Thanks for clearing it up Nessism.As it happens I just won a new 105 10 spd chainset on Ebay for $68.A bargain if I say so myself.And I think it actually looks better than the Ultegra.Who wants an FSA Gossamer ISIS cheap?
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