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How to buff out scratches on a crank?(15 posts)

How to buff out scratches on a crank?Me Dot Org
Jul 30, 2002 9:02 PM
My cranks have gotten scratched over time - what do you recommend to buff them out?
Long, soft, baggy pants on a century should do it!Quack
Jul 31, 2002 5:38 AM
Actually, Mother's chrome polish works really good if your working bare metal. If the cranks are coated, just ride them, or grind all of the coating off of them and then keep polishing weekly for the rest of the bike's life. I would just ride them and be proud.
Mother's Mag Aluminum Polishjose_Tex_mex
Jul 31, 2002 6:04 AM
There's a whole bunch of products out there that can help. It depends on how deep the scratches are. If they are more like rub marks the Al polish should do. If they are deep you will probably want to take them off and bring them to a professioanl metal polisher.
Go to your local car detailing store and they should have plenty of Al polishes. You want something that will work on Al Mag wheels - no clear coat. I have used the Mother's polish on al my Al pieces and it works well. It comes in a little tub like the chammy but'r and is red and white in color.
I hope your name brand is not a sticker as this usually gets trashed during the process. However, the stuff really does shine - looks more like chrome.
Agreed, some sort of Mother's Polish.0_Kewl
Jul 31, 2002 7:53 AM
make sure you get the right kind.
Have you used Mother's Mag Aluminum Polish on Campy?Me Dot Org
Jul 31, 2002 8:18 AM
After reading Doug's Post below, I'm a little nervous about using it on Campy.

I think I'll check with a couple of bike shops, too...

Thanks for the feedback, though.
Just Shimano, but I doubt brands matterjose_Tex_mex
Jul 31, 2002 8:42 AM
What Doug said is true. On my Dura Ace cranks there's some sort clear coat (although it could be a polishing technique) that looks somewhat irridescent. However, if your cranks are badly scratched the polished version look will be better than the clear coat.

As mentioned before, a professional polisher will make your cranks literally look like a mirror. However, because they will oxidize again, you will have to rub them at least every month. This won't take long.

Clear coating newly polished cranks usually makes them look dull. Whatever they do in the factory is much more difficult than just spraying them at home.

By the time you have them polished by a pro you probably will not be far off the price of new cranks. I just saw Ultegra Cranks for sale at Performance for $99.

Scratches can come out, but gouges usually stay.
Rub your crank at least once every month? Oh my... (nm)Gregory Taylor
Jul 31, 2002 8:52 AM
If those are as deep as they lookgrandemamou
Jul 31, 2002 6:41 AM
Mothers polish ain't gonna do it. You may try an auto detail shop. It will probably require mechanical intervention.

Or wear them proudly as battle scars.
may not want toDougSloan
Jul 31, 2002 7:13 AM
I've tried buffing both DA and Record cranks. They both have a sort of clear coat or other type of finish. When you buff, especially enough to remove scratches, you remove the finish. You get a brightly polished finish where you buffed and more of a satin finish where you did not. It looks like crap. Your only choice at that point is to polish the whole crank, which is a really pain in the butt (or match the stock finish, which I have no idea how to do).

Bottom line, you may want to do nothing. You could very well make it look worse.

BTW, what that heck are you doing to get it so scratched up like that?

Doug
may not want toMe Dot Org
Jul 31, 2002 8:31 AM
Thanks for the feedback. I checked Campy's website, no help there. No help at Park Tools' site either.

As to how I've done it...well, the bike has fallen over a couple of times. I live in an Studio apartment on the 4th floor, and sometimes getting the bike up and down stairs or in the elevator is not pretty. Add leaning up against parking meters and ???
may not want toMe Dot Org
Jul 31, 2002 8:34 AM
Thanks for the feedback. I checked Campy's website, no help there. I couldn't find anything at Park Tools or Sheldon Brown site either.

As to how I've done it...well, the bike has fallen over a couple of times. I live in an Studio apartment on the 4th floor, and sometimes getting the bike up and down stairs or in the elevator is not pretty. Add leaning up against parking meters and ???
If they are as deep as they appear....Gregory Taylor
Jul 31, 2002 8:59 AM
...you won't remove them as much as just sort of blend them in and maybe make them less noticable. I've polished old cranks on my buffer (cloth buffing wheel on a bench grinder), and you will have to move a lot of metal to totally take those scratches out. It will also remove any coating/anodizing on the crank, meaning that it will eventually oxidize after a while. That's easy to take care of -- a little Simichrome polish (or mag polish) will shine them right up.
Your title is killing meLandsharkrider
Jul 31, 2002 12:49 PM
Rub out scratches on a crank????

HAHAHAHAHAHAHAHAHAHAHAHAHAHA!!!!!!!!!!
It's difficult not to slip into Bevis & Butthead mode...Gregory Taylor
Aug 1, 2002 5:18 AM
...with this topic. "Heh,heh,heh,he said that he was gonna polish his crank...heh, heh, heh, what a buttmunch. Bevis, cut that out!"
you said "crank"Landsharkrider
Aug 2, 2002 6:51 AM
huh huh huhhuhhuh huhhuh huh huhhuuhuhuhuhuh