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Decided I'd give it a whirl (Since I'm waiting for my Niner frame to get here).

It turned out pretty sweet IMO. I used caustic soda and water. Scotch Brite pad, and Mothers aluminum and mag polish, and a Mothers ball on the drill. Took under an hour. I did NO sanding.

Don't really know how silver cranks will look on my new white Air 9, so I may sell em.

 

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I also de-ano'd and polished my XTR cranks while I was working on another polishing project, but I did wet sand. This was about 3 hours worth of elbow grease, 400, 600, 800, 1000 grit plus jewelers rouge plus polish to finish it off.

Bicycle part Metal Tool Steel Aluminium


Metal Steel Household hardware Tool Wrench


Rim Automotive wheel system Spoke Alloy wheel Metal
 

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CHSAD said:
That's interesting. Stripped I like the look of the SLX better...
Interesting... I also think the SLX looks lots better stripped than the XTR. Though I like the stripped XTR better than a standard XTR. :eekster:

I really like the way it looks on that Niner frame. You should def. keep it. :thumbsup:
 

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I think the SLX cranks look better than XT or XTR, whether anodized or not. I've also heard that they are just as light -- the main weight savings in the more expensive cranks is in the chainrings. Those polished silver ones look great, and silver looks good on any color bike.

You could spray a clear coat on them to help keep them shiny. They'll eventually get scuffed up and oxidized anyway, but a clear coat will delay that somewhat.

These used to be shiny polished too.
 

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Thanks for the tip, Addam. I did the same with my SLX cranks. I found some Roebic brand heavy duty drain crystals (100% sodium hydroxide) at Lowe's and slowly stirred 4 tablespoons into a gallon of lukewarm water (not hot, not cold). I stirred the solution with a wooden dowel and added the crank arms (sans all hardware). Nothing seemed to happen for the first 1-2 minutes, so I added a 5th TBSP, probably unnecessary, because then it started to bubble and fizz... you could see some kind of chemical reaction beginning. I carefully stirred the parts and immediately the wooden dowel was literally wiping the gray annodizing off the cranks to the bare metal !!! WOW, this stuff works FAST!!

After 5 minutes I removed the crank arms, let the excess solution drip off (there was literally smoke coming off the parts as I suspended them... ) then I placed in a smaller rinsing container, where I rinsed the parts for a few minutes in warm water. Then I wire-brushed off the annodizing... it came off like it was nothing!!! In a few minutes the annodizing was GONE. I did the same for the other crank, and rinsed everything thoroughly. Next I sanded with a fresh Scotchbrite pad, which produced a darkish residue, but then polished into a nice luster (like brushed aluminum).

Next I buffed on my bench grinder using a cotton wheel and yellow all-purpose rouge. This put a mirror like finish on it. Finally I polished with Mothers Mag cleaner (presoaked pads). The whole job took about an hour. Just be really careful with the caustic soda... Make sure to wear sealed safety goggles and chemical gloves, and slowly add the CRYSTALS TO THE WATER, NOT the other way around. Avoid splashing... If you follow a few safety rules, it's really simple... but get this stuff on you or your clothes and it's nasty.... I read lots of safety stuff on it before attempting it.

Finally I neutralized the bath with a few tablespoons of vinegar when I was finished, after which a poured it down the drain of my utility sink.

Here is how they look now... I LIKE!!!

 

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Big Boy
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sorry to resurrect this, but how does the shine hold up?

Im thinking about doing this to my slx cranks, but im worried that after a few months they will start to oxidize. What were your experiences with this? how did you prevent it if needed?
 
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