Cracked plastic BB cup

[longers]

If "cup" is the right word for it.

The plastic screw in bit on the left hand side of the Bottom Bracket has cracked somehow and the whole thing creaks a bit now.

Is it possible to get a replacement cup or is it a case of getting a whole new BB? It's a 68mm.

Oh, yeah, you don't need to tell me - plastic ones are poo.

 

[4F]

Hmm I would be interested in this as well. I must admit having doubts of the strength when I fitted mine a few months ago.

 

[Gerry Attrick]

I think the crucial thing is not to overtighten them. The tendency is to screw them completely home, when they only need snugging up. The taper on the inner sleeve then takes out any free movement the cartridge has in the BB shell.

 

[beanzontoast]

Your LBS might have one lying around from replacing old bb's - worth a try.

 

[Landslide]

Wot Beanz said.

 

[andy_wrx]

Never broken one getting it in, but bust one trying to get it out !

Dunno what sort of nylon they're made from, but suspect made in same factory as Philadelphia cheese.

Apparently LBS technique is to unscrew the other (steel) side and remove cartridge, then smash them out...

 

[TheDoctor]

TBH once it's in, I tend to leave it there...

 

[redjedi]

Is it the white shimano one?

I have the old one from the BB I replaced last weekend. It's a bit dirty and about 7 months old, but undamaged (I'll double check that) if you can't find one locally and want it.

I may even clean it first.

edit: Not sure it will fit though as it's from a Bianchi, so italian thread I believe, but I'll have a look if you want.

 

[fossyant]

Let me know. There is a good chance I have an unused plastic one. I reuse my metal ones

 

[longers]

Apparently LBS technique is to unscrew the other (steel) side and remove cartridge, then smash them out...

That's what I'll be doing once I get the other side out. The plastic side has partially come out, and my bb tool is crap and I'm off to find another one.

Cheers for the offer Fossy but I'm going to splash out on one with a metal non drive side cup.

 

[fossyant]

Cheers for the offer Fossy but I'm going to splash out on one with a metal non drive side cup.

Wise move..