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Hollowtech II / X-Type / Mega Exo / GXP Bottom bracket service...

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Hollowtech II / X-Type / Mega Exo / GXP Bottom bracket service...

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Old 10-16-09, 10:09 PM
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Hollowtech II / X-Type / Mega Exo / GXP Bottom bracket service...

One of my Diabolus cups had an odd noise coming from it. I had a standard Raceface set of cups with 1 bad bearing laying around, so I thought what the heck! I'll swap bearings.

Things to watch out for.

-Use an exacto or something to lightly pry the plastic bearing cover away from the face of the bearing just enough that you can slip a couple of small flat "thingies" under it to pry the whole cover away from the bearing at the same time. I broke one b/c I pried one side at a time.

-There is a small rubber seal around the OD of the bearing, so when you do use that exacto...don't stab it.

-Lightly tap from the inside/I.D. all around the circumference until the bearing pops out. (they're not pressed in very tight)

-Thoroughly clean the cup, outer seal, and bearing cover before you re-grease and put the new bearings in.



You don't need special "bearing service tools" and all that crap that pads the pockets of the already insanely overpaid pimps out there.



For the ghey roadie who has everything.

Last edited by ed; 10-16-09 at 10:18 PM.
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Old 10-17-09, 06:28 AM
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Sockets that are the same size the bearings are the best thing to use. One socket to knock bearing out from the inside and the other to press it back in evenly. Use a vice to press them back in.
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Old 10-17-09, 07:22 AM
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Originally Posted by chelboed View Post
-Use an exacto or something to lightly pry the plastic bearing cover away from the face of the bearing just enough that you can slip a couple of small flat "thingies" under it to pry the whole cover away from the bearing at the same time. I broke one b/c I pried one side at a time.
Extra FSA caveat: Save that little plastic dust cover if it's at all salvageable. It has a sleeve that slips in between the 20mm inner race and the 19mm BB spindle. You need it and they cost $8 EACH (plus about that much shipping) from FSA.

Originally Posted by chelboed View Post
-Lightly tap from the inside/I.D. all around the circumference until the bearing pops out. (they're not pressed in very tight)
. . . unless you toasted the bearing and it all fell apart leaving you with just the outer race inside the cup. Then it gets more interesting .
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Old 10-17-09, 07:54 AM
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Originally Posted by dminor View Post
Extra FSA caveat: Save that little plastic dust cover if it's at all salvageable. It has a sleeve that slips in between the 20mm inner race and the 19mm BB spindle. You need it and they cost $8 EACH (plus about that much shipping) from FSA.

. . . unless you toasted the bearing and it all fell apart leaving you with just the outer race inside the cup. Then it gets more interesting .
They're $3.99 at universalcycles.


Mega Exo Bearing Cover Plastic MS148 Each
Mfg#: 230-4010
Save for Later Oregon 3 by Tomorrow
Midwest 1 by Monday
$3.99
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Old 10-17-09, 08:30 AM
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If you can, the Enduro Bearing replacement bearings have the ID face stepped down a touch to match the spindle - meaning you don't need to use the crappy little plastic shim part between the bearing and spindle interface.

http://www.enduroforkseals.com/id254.html

Much, much better. Stays cleaner, develops less play, and the bearings are better.

Fairly easy to swap the bearings into the cups. I found the best luck doing so while leaving the cups in the frame. But yeah, otherwise, it's pretty easy to service the existing bearings as well.
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Old 10-17-09, 08:33 AM
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Originally Posted by scrublover View Post
If you can, the Enduro Bearing replacement bearings have the ID face stepped down a touch to match the spindle - meaning you don't need to use the crappy little plastic shim part between the bearing and spindle interface.

http://www.enduroforkseals.com/id254.html

Much, much better. Stays cleaner, develops less play, and the bearings are better.

Fairly easy to swap the bearings into the cups. I found the best luck doing so while leaving the cups in the frame. But yeah, otherwise, it's pretty easy to service the existing bearings as well.
When I was looking at those (w/o reading) I wondered what the crap they did there. That's flippin' wonderful. I'm def. going that route when it's time for new bearings. Last time I just bought new Diab. BB at $43. Now that I know it's easy...this will save money and result in a better BB.
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Old 10-17-09, 09:03 AM
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Originally Posted by chelboed View Post
When I was looking at those (w/o reading) I wondered what the crap they did there. That's flippin' wonderful. I'm def. going that route when it's time for new bearings. Last time I just bought new Diab. BB at $43. Now that I know it's easy...this will save money and result in a better BB.
Even with cleaning/regreasing, the stock setup on my past RF bb sets sucked and they didn't last long. IMO the interface and the way the bearings get preloaded is bad on RF cranks and leads to shorter life anyhow.

Still using one RF bb with the Enduro bearings, and one full Enduro bb set with Shimano cranks and they have been working beautifully for a few years now.
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Old 10-17-09, 12:03 PM
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Originally Posted by scrublover View Post
If you can, the Enduro Bearing replacement bearings have the ID face stepped down a touch to match the spindle - meaning you don't need to use the crappy little plastic shim part between the bearing and spindle interface.
.
I've used Enduro a few times, they have a great product.
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Old 10-18-09, 08:20 PM
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Originally Posted by chelboed View Post
They're $3.99 at universalcycles.
Thanks for that, Ed.

Originally Posted by scrublover View Post
If you can, the Enduro Bearing replacement bearings have the ID face stepped down a touch to match the spindle - meaning you don't need to use the crappy little plastic shim part between the bearing and spindle interface.
So it's a 32/19? That's awesome! Sealed bearings, if the seal is any good, don't need a dust cap anyway. But now I gotta know how much? If it's twice or 3 times more than a standard 6804RS, not sure it's worth that much to me . . . I'd just get the crappy sleeves at Universal. I think the std. I bought at Brown Bearing was only about $5.
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