Corrosion to BB on 2011 carbon Supersix

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Spikey
Posts: 1
Joined: 8 Jan 2020, 10:19am

Corrosion to BB on 2011 carbon Supersix

Postby Spikey » 8 Jan 2020, 10:40am

IMG_0428.PNGHi all,

Hoping for some advice, I’m thinking of buying a 3011 Cannodale supersix frame only but it has some corrosion to the BB, it’s a BB30 pressfit and as you can see by the photo the corrosion has gone through the first layer of aluminium. Do you think I’m mad buying it or would I get a few years out of it? Can I treat it with anything to halt the corrosion?
Any advice would be much appreciated

Cheers
Image Attachments
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Jamesh
Posts: 805
Joined: 2 Jan 2017, 5:56pm

Re: Corrosion to BB on 2011 carbon Supersix

Postby Jamesh » 8 Jan 2020, 3:47pm

Hi

It wouldn't put me off buying it if the price was right. - say £300.

My supersix has a bit of corrosion on the bb face.

I haven't had a problem with the bb30 till I greased it before lejog and it started squeeking. But has since quietened down. I have some new bearing which I should fit sometime.

I would freeze the bearings before putting them into frame then they will go in easier same with the chainset freeze it first and it will go into bearings easier.

Cheers James

Valbrona
Posts: 2258
Joined: 7 Feb 2011, 4:49pm

Re: Corrosion to BB on 2011 carbon Supersix

Postby Valbrona » 8 Jan 2020, 9:58pm

No problem if you plan to run a regular 24mm crank as you can fit one of these:-

Image
I should coco.

Darkman
Posts: 144
Joined: 30 Aug 2019, 8:46pm

Re: Corrosion to BB on 2011 carbon Supersix

Postby Darkman » 8 Jan 2020, 11:37pm

Worth mentioning that aluminium corrosion is actually aluminium oxide, not rust as you'd get with steel.

The aluminium oxide protects the aluminium and prevents further corrosion, so your best bet is to just leave it alone and there won't be a problem.

tim-b
Posts: 1146
Joined: 10 Oct 2009, 8:20am

Re: Corrosion to BB on 2011 carbon Supersix

Postby tim-b » 9 Jan 2020, 7:11am

Hi
Is this a carbon fibre (CF) frame? You can get a destructive galvanic corrosion where aluminium components are in contact with CF. I can't see it in your photo, but have a close look at the joint line between the two materials on both sides. Manufacturers are well aware of this and use a "neutral" layer, e.g. glass fibre, to prevent direct contact between the two materials
Regards
tim-b
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