General Category > The Knowledge
Dealing with rust / refinish
bobb:
My touring bike is about 15 years old now. There are a few places with very minor bubbling below the surface, but one place where there is more rust - the chainstay bridge where the mudguard mounts. I guess this is an area where water gets in under the mudguard clip.
A few pics (linked to biggies):
I'm thinking of getting the frame powder coated. I'm assuming this rust isn't so bad that it won't get taken care of when they blast it? Or is it? I'm sure the more minor stuff will be no problem, it's just the above that I'm a bit worried about.
I did spray (thinned) Waxoil inside the frame when I got it, so I'm hoping all is good internally. If it isn't - how on Earth can you tell anyway?!
Any thoughts much appreciated.
mrcharly-YHT:
That is bad - what would bother me more is the thin line on the BB/chainstay join in the third picture.
I'd go for an aggressive wire-brushing off of the rust on the chainstay, and pick at it with a small screwdriver, really dig into the pits.
bobb:
Hmmmm... You think it needs to go to a frame specialist for repair?
LittleWheelsandBig:
Chainstay bridges don’t do very much to strengthen a frame. That said, I would look very hard at the bridge’s corrosion as potentially the corrosion could be penetrating into the chainstays themselves out of view within the bridge (unless you squirted something into the bridge years ago).
rogerzilla:
--- Quote from: LittleWheelsandBig on 26 April, 2021, 12:38:04 pm ---Chainstay bridges don’t do very much to strengthen a frame.
--- End quote ---
They do if the chainstays are long, making a stiff box at the back with the hub on the opposite side (according to Tony Oliver"s book, anyway). Not so much on racing bikes, which don't necessarily have one at all, if they have vertical dropouts or track ends.
The bridge actually serves three purposes:
1. Stiffness where the stays are long, as on a tourer
2. Somewhere to bolt a mudguard
3. Stops the tyre jamming when you remove a wheel with forward-facing dropouts
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