Challenge removing BB90 bearings

Discuss light weight issues concerning road bikes & parts.
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SirEddy
Posts: 205
Joined: Mon May 16, 2005 10:43 pm
Location: No fixed abode

by SirEddy

Hey experts. I'm hoping someone can advise me.

I noticed some play in the BB on my Trek Cronus CX. Removed the cranks on NDS bearing but I can't remove the DS bearing. Even with the appropriate Park Tool there is not enough room behind the bearing for the bushing to sit and hit against because of a plastic sleeve which runs between the two bearings. I tried to slide the sleeve to the side but it won't budge.

Any suggestions? If necessary I can take a photo, but I figured some people here may have more experience with BB90 than I do.
Long live long rides

2002SaecoReplica
Posts: 1944
Joined: Mon Oct 25, 2004 10:02 pm
Location: Getting dropped

by 2002SaecoReplica

BFH...
- Zipp rims will break if you look at them too hard
- R-Sys wheels will spontaneously explode
- The ZG crankset will never, ever exist
- Everyone needs Lightweights, even if they're fat and old
- Parts actually made of metal are SO 10 years ago

by Weenie


pawnii
Posts: 359
Joined: Sun Sep 27, 2009 9:54 am
Location: Australia

by pawnii

I used a headset remover to bash mine out.
It's not easy to do without damaging the bearing.

You could also try using an ice pack on the bearing to shrink it a little. :noidea:
2012 Scott Foil Premium

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SirEddy
Posts: 205
Joined: Mon May 16, 2005 10:43 pm
Location: No fixed abode

by SirEddy

2002SaecoReplica wrote:BFH...


Big f...n hammer??

Sounds like I need to stop being so gentle
Long live long rides

Dagger9903
Posts: 54
Joined: Mon May 21, 2012 7:40 pm

by Dagger9903

Try using a compressed air can upside down to spray on a little liquid CO2 directly unto the stuck part. The cold will cause shrinkage and bashing it out will be easier. I had a b*tch of a time getting out my cups until I did that. OH yeah, I used a bigger FH as well!

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breezerboy
Shop Owner
Posts: 277
Joined: Fri Jun 22, 2007 8:14 pm
Location: UK

by breezerboy

An internal bearing puller is the way to go - http://www.enduroforkseals.com/id197.html
Far less chance of damaging the frame/bearing seat.

To be honest, 50% of the BB90 treks we see have at least one bearing that falls out the frame with little or no effort.

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cerro
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Location: Stockholm, Sweden
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by cerro

pawnii: So slim head remover?

I used the proper Park Tool tool last week, wasn't any problems on a Scott Addict so shouldn't be on a Trek what I've seen last time working on one.
/jonas l
http://cerrol.wordpress.com (my cyclingblog)

by Weenie


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SirEddy
Posts: 205
Joined: Mon May 16, 2005 10:43 pm
Location: No fixed abode

by SirEddy

Thanks for the replies people. In the end I used the hammer and socket extension to whack that bearing out. Did it without damaging it, but doesn't really matter as the bearing is done anyway.

I love buying tools, but it also seems ridiculous at times what we need to spend on something we may only use once/year, which will be obsolete in two years when the newest standard comes out. Maybe I'm just still bitter about my 10s Campy chain tool :evil:
Long live long rides

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