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BB replacement question

Old 10-11-15, 07:00 AM
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Tandem Tom
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BB replacement question

I have a BB-7000 on our Co-Motion Tandem that will need replacing. The crankset is a FSA Mega Exo. Is the BB-7000 the only "model" I can use?
Thanks!
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Old 10-11-15, 07:06 AM
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I think I may have figured it out! I think all I need to do is measure vthe BB she'll on the frame. Correct?
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Old 10-11-15, 08:39 AM
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Generally the Bb axle length is also needing to be measured. Especially on a tandem which can have longer the typical BB axles to allow for a triple and LH timing chainring. Andy.
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Old 10-11-15, 09:36 AM
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Originally Posted by Andrew R Stewart View Post
Generally the Bb axle length is also needing to be measured. Especially on a tandem which can have longer the typical BB axles to allow for a triple and LH timing chainring. Andy.
I don't think the BB-7000 is available in different widths, what difference would that make?

Tandem Tom, I'm new to bottom brackets but was just recently researching Mega-Exos. So I'm no pro but it seemed that in my reading there were some that were compatible with Shimano hollowtech II bottom brackets but it was hit and miss. I think the difference was the FSA aluminum road cranks were Shimano-compatible but carbon ones were not. Like the carbon ones were a fraction of a millimeter larger bore or something like that. However, the BB-7000 appears to be for their mountain cranks so I'm not sure. What crankset do you have ("Mega-Exo" is not the model of crankset but the style of the bottom bracket interface)?

Last edited by T Stew; 10-11-15 at 09:39 AM.
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Old 10-11-15, 09:47 AM
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TT, see if you can make use of this... http://www.stilen.com/bike_stuff/Meg...l_040820-1.pdf
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Old 10-11-15, 10:53 AM
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You may want to check the reviews on this site: FSA BB-7000 V-Drive Mega Exo BB | Chain Reaction Cycles

You mentioned that your current BB 7000 has quit, but you didn't say how long it lasted. Others complain that it has a short life expectancy.
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Old 10-11-15, 11:06 AM
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I will answer both questions. The crankset is FSA Gossamer Tandem Crankset. Not sure how many miles on this BB but I rebuilt them with Phil Wood bearings. We don't put a lot of miles on but it did seem to wear out pretty fast.
After doing a bit more reading I am totally confused!! Cannot figure out what will be a good substitute. Maybe I will start another more specific thread.

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Old 10-11-15, 11:30 AM
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Originally Posted by Tandem Tom View Post
I will answer both questions. The crankset is FSA Gossamer Tandem Crankset. Not sure how many miles on this BB but I rebuilt them with Phil Wood bearings. We don't put a lot of miles on but it did seem to wear out pretty fast.
After doing a bit more reading I am totally confused!! Cannot figure out what will be a good substitute. Maybe I will start another more specific thread.
In the link I gave you, some reviewers said Shimano has a more durable BB that will work in this application. I have no idea how you can tell what will work with your existing crank set. With this system, you have a shaft that runs through the hollow BB, right? So you need a BB that will accommodate the diameter of your shaft. I hope more knowledgeable people will chime in.

BTW, Phil Wood bearings are supposed to be the best there are, yet yours quit? Hmmm....
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Old 10-11-15, 05:40 PM
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"I don't think the BB-7000 is available in different widths, what difference would that make?" T Stew

You are right, I was thinking separate spindle VS one piece that is referenced. But in my defense much of my answers are for others too. Guess I was lost in these possible readers who might have tapered square or splined Bbs and thought only shell width was important. Andy.
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Old 10-12-15, 06:43 AM
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Here is some previous discussion I found on this matter. Yeah the Gossamer should be compatible (I bolded that part)...

Originally Posted by SushiJoe View Post
Answer from FSA’s Dae Oh


The short answer; no, the FSA K-Force Light Rd. Crank is not compatible with a Chris King bottom bracket (made to Shimano compatible dimensions). Also, the K-Force Rd. crankset will not be compatible either.


The FSA BB8200 (meant for K-Force Light) uses a 6 mm width bearing. This allows us to make the bottom bracket outside to outside dimension more narrow providing room for a wave washer. The BB8000 (meant for K-Force) does indeed use a 7 mm width bearing, yet its design does not allow for use of a Chris King bottom bracket.


However our popular alloy cranksets, the Gossamer Rd. and the Energy Rd. is compatible with the Chris King bottom bracket (made to Shimano compatible dimensions). These cranks use BB6000, this BB's dimensions are compatible with Shimano.
Dae Oh
Full Speed Ahead
Check out http://www.bikeforums.net/road-cycli...ml#post8412886
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