Rust on Rims

[Dealer01]

 

 

 

Hi

 

I have the spokes on my wheels showing rust. The rust seems to be on the surface only cause if I scratch it off' date=' the spokes don't show any pot marks.

 

I do not know the spec of the wheels, it just says "Shimano Wheels" and they have 8 spokes a side. My concern is if the rust is weakening the spokes, and because it only has 16 spokes - do i run the risk that a spoke can break and the wheels will collapse ?

 

Attached i have a pic.

 

Thanks - any ideas or opinions welcome.

 

Cheers

 

[/quote']

 

There was a batch of those wheels a few years ago that had that

problem, but Cool Heat(local Shimano agent) replaced the spokes free of

charge.

They claimed it was "the black coating & not the spoke rusting".

It looks like the old Shimano 105 wheel, WH-R550 I think..

Have seen those wheels break spokes, but not due to surface rust.

Speak to your LBS or contact Cool Heat Agencies.

Can't hurt trying to get it sorted for free.

Dealer012009-11-24 02:45:21

[Lotus]

 

OK' date=' I'll bite on this one.

 

I think the story that a forward-facing QR can snag on something, open up and make you plant your fork in the soil is an old wives' tale.

 

A QR should be toit, toit, so tight that when you push the lever it in leaves a white mark on your skin. Now, for that thing to be opened by a passing twig and not pull you off balance in the first place, is impossible.

Futher, it will have to be some sort of special obstacle that opens it. A head-on collision with something won't do the trick, the lever has to swing in an arch. I can't envisage a real scenario where that will happen.

 

However, I'm awaiting a flood of anecdotes to prove me wrong.

 

 

[/quote']

 

OT - I agree with you on this. I do, as a matter of habit,  always "park" the QRs in the same "tucked in" position so that I can see (without consciously looking) if they're out of position - that way I'll know to check the tightness before something goes wrong.

 

Back to the topic - if you have rust to remove from brightwork, use aluminium foil and Coke. You'll be surprised how well it works, and without leaving scratches. Coat lightly with Q20 (although I prefer a good automotive wax) to protect the finish. STAY AWAY FROM THE BRAKING SURFACES with this.

 

[firefox]

Could it be an Acid Bottle? ie swimming pool acid?

[Black_Jack]

 

Thanks for the foil / coke tip. I'll sure try it. (Amazing all the things Coke can do... even more amazing that we know that Coke can remove rust and still drink it !)

Black_Jack2009-11-25 07:03:17

[droo]

Johan' date=' the Cr oxide layer on SS can be compromised by a few things - exposure to mild steel, 'v'-shaped scratches and prolonged exposure to salty water being among them. So the brake dust theory is plausible - the dust particles could cause water to accumulate around them, and cause localised corrosion. But you're right, the spoke-to-rim connectors should be showing signs of corrosion too - if they're alu. Maybe they're brass - Shimano have been known to make quality parts from time to time...[/quote']

 

?

 

I'm convinced those are alu, they are too dull for plated brass.

 

?

 

Please explain to me how V-shaped scratches can contribute to rust, I understand the other contributors but not this one. Thanks.

 

Don't remember the details exactly, and my reference material's 7500km away, but the 'v' shape stops the protective chromium oxide coating from reforming. Something to do with the proximity of the sides of the scratch and charge distribution, I'd guess Edman would have an answer there? This also happens at stress cracks, for the same reason.

 

 

 

As for the magnet test, Edman's spot on.