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Help... REALLY TIGHT FSA Mega EXO crank in Shimano BB

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Help... REALLY TIGHT FSA Mega EXO crank in Shimano BB

Old 11-10-15, 12:38 AM
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Help... REALLY TIGHT FSA Mega EXO crank in Shimano BB

My 8-year-old road bike originally came with FSA Gossamer compact crankset and a FSA Mega EXO bottom bracket. Three years ago, the FSA bottom bracket failed and my LBS replaced it with the Shimano equivalent. (I didn't have time to do it myself - big ride coming up, etc.)

The Shimano BB has been creaking the past week (roughly 15K km) and I took it apart tonight. Well, I tried to. I got as far as removing the left side crank arm. The chainring should really just push out, but after some Internet searches, I realize that the FSA crank and the Shimano BB is a really tight fit. My LBS did not tell me that when they made the replacement - they must have had a tough time getting it in!

Question: How do you suggest removing the crank off the bottom bracket? I've tried spraying lube wrench and some tapping with a mallet with no success. I'm a little concerned about bending the frame if I use too much force. Any advise?
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Old 11-10-15, 01:59 AM
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Hit it harder.
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Old 11-10-15, 07:38 AM
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Use a wooden block and a large hammer. You need the extra mass (rather than hard blows) to budge a stubborn item like this. You may need a helper to hold the bike steady.

Last edited by habilis; 11-10-15 at 07:43 AM.
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Old 11-10-15, 08:52 AM
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Block, hammer (or rubber mallet in place of both) and some balls. Smack it.
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Old 11-10-15, 09:18 AM
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More penetrating oil and time.
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Old 11-10-15, 07:02 PM
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Yep, FSA cranks can be a very tight fit in Shimano BBs. You don't have much choice, all you can do is hit it harder. Block of wood and a dead blow hammer. In theory, a air hammer might work better but I doubt one's available.
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Old 11-10-15, 07:27 PM
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Sometimes it helps to unscrew the NDS cup if your bb is threaded.
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Old 11-12-15, 07:35 PM
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Update?


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Old 11-12-15, 08:55 PM
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Yes, so what's up with FSA cranks on a Shimano BB? I have a front derailleur adjustment issue. Is there that much of a difference that you should keep cranks and BBs from the same manufacturer?
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