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Rusty BB tale of woe

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Rusty BB tale of woe

Old 08-02-20, 10:32 AM
  #1  
samkl 
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Rusty BB tale of woe

Noticed some rust on the BB of a fairly new bike, 7 months old with ~1200 miles on it. I took it apart and find it completely corroded! A little pile of rust flakes left in the frame (all from the BB- the frame has no rust at all). Bearings spin, but arenít so smooth.

I rode this bike in the rain only a couple times, and wiped it down afterwards. Bike is stored indoors too.

I have a Shimano UN-55 with 6000 miles on it and it looked brand new when I took it out of the frame. I donít want to besmirch Tange BBsí reputation, but jeez.


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Old 08-02-20, 10:40 AM
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crap happens

condensation happens,, blow out that stuff , "Framesaver" the inside of the tubes put in a new BB..

save the left mounting piece, after you clean it up, and use a cheaper UN 26 , and that piece if you don't like the plastic one.







Last edited by fietsbob; 08-02-20 at 10:45 AM.
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Old 08-02-20, 10:59 AM
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The adjustable cup is maybe the most rusted part of all. After I cleaned it up it was pitted and corroded like youíd expect on a maltreated 20-year-old bike.

Frame has no rust at all, in contrast to the BB.

Originally Posted by fietsbob View Post
condensation happens,, blow out that stuff , "Framesaver" the inside of the tubes put in a new BB..

save the left mounting piece, after you clean it up, and use a cheaper UN 26 , and that piece if you don't like the plastic one.






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Old 08-02-20, 11:04 AM
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Condensation rusted the inside un painted surfaces of the steel tubing..
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Old 08-02-20, 11:07 AM
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I already put the thing back together so I canít take a picture, but no, the frame had no rust at all. I just wiped away the rust flakes and the frame was pristine inside.

It came from the factory with an anti-rust coating, which mightíve helped.

Point is the BB is pretty low quality.

Originally Posted by fietsbob View Post
Condensation rusted the inside un painted surfaces of the steel tubing..
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Old 08-02-20, 11:20 AM
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Spend more to get better https://www.renehersecycles.com/prod...ttom-brackets/
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Old 08-02-20, 11:24 AM
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Tange is higher quality than the Shimano BBs. You have something going on in there. Water got into your frame. You say 7 months old bike, but I have never seen a bike come with a Tange BB. Who put it together when it was new? BB looks like an older version to me.
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Old 08-02-20, 11:51 AM
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...this is also my experience (better quality) with Tange sealed units. There's something else going on, but I have no idea what it is.
If it were me, I'd switch to using a nylon plastic adjustable side retainer, and drill some weep holes in the BB shell while it is empty.

At the very least, I'd probably install the new BB unit with some kind of anti-seize on the threads, if I didn't use a plastic ring.
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Old 08-02-20, 12:15 PM
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Bike is a Wabi Classic. The BB appears to be a lower end model, with a steel retaining ring and a solid axle.

Also - this is probably relevant - I donít think it was installed properly. The BB was barely torqued down when I unscrewed it.

Originally Posted by trailangel View Post
Tange is higher quality than the Shimano BBs. You have something going on in there. Water got into your frame. You say 7 months old bike, but I have never seen a bike come with a Tange BB. Who put it together when it was new? BB looks like an older version to me.

Last edited by samkl; 08-02-20 at 12:20 PM.
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Old 08-02-20, 12:34 PM
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Hmm. When I search for this BB number it comes up with a TH industries or FSA bottom bracket, not Tange.


Did somebody switch?
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Old 08-02-20, 12:36 PM
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Nope, I bought it from Wabi.

Originally Posted by trailangel View Post
Hmm. When I search for this BB number it comes up with a TH industries or FSA bottom bracket, not Tange.


Did somebody switch?
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Old 08-02-20, 02:12 PM
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IIRC, Tange made the Shimano-branded cartridges.
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