chipped Rims and brakes

siafirede · 2010-05-10, 09:54 PM

On my KH 29er XC rim, I seem to have a little chip on the braking surface. Maybe in two areas. They are uneven dents with rough edges that must have been from the uni hitting a rock during a bail/UPD/fall. I was experimenting with putting brakes on the 29er and I can definitely hear/feel when the pads go over the chip on the braking surface.

What are my options here? Can I sand the problem area down some? Do I just need to deal with it or is there something I can do to make braking better?

The chips are very small, and I never noticed them before adding the brake (I kind of want one now that I am using a geared 29er off road).

kb1jki · 2010-05-10, 10:08 PM

sand paper and then emery cloth should help. that's where I'd start. remove the rough edges so they don't chew up your pads. You'll probably feel the thump as it goes around, but it shouldn't bother anything beyond your nerves.
check around the damaged areas to see if there are any cracks or hairline fractures coming from the damage. Don't try to unbend aluminum.

1-wheeled-grape · 2010-05-10, 10:11 PM

once they're sanded i doubt you'd notice them, especially if your muniing.

Max_Dingemans · 2010-05-11, 03:12 AM

Just using the brake is a lot like sandpaper. You probably won't notice the chips after a few long downhills riding the brake.

rob.northcott · 2010-05-11, 10:17 AM

Quote:

Originally Posted by kb1jki

sand paper and then emery cloth should help. that's where I'd start. remove the rough edges so they don't chew up your pads. You'll probably feel the thump as it goes around, but it shouldn't bother anything beyond your nerves.

No, you missed your chance there - surely what you meant to say was "no, your rim is completely screwed and you'll never get the brakes to work properly again without converting to a disc..."

Rob

kb1jki · 2010-05-11, 05:06 PM

I try not to be that bad. I feel guilty enough milking the disk thread to death, but I try to keep that stuff in there. I feel most would benefit from disks, but that's another thread!

ezas · 2010-05-12, 12:48 AM

Use a black emery board (fingernail file). Get a course/medium. And if you want a Pink Fine. Any Walmart/Wagreens/RiteAid will have them.

Using a fingernail emery board with keep your braking surface true and flat and you will only knock down high spots.

Put some masking tape on both sides of the rough areas so that you only sand where you need to.

2010-05-10, 09:54 PM	#1
siafirede Flex Your Head Join Date: Apr 2004 Location: Melbourne, Australia Age: 28 Posts: 2,291	chipped Rims and brakes On my KH 29er XC rim, I seem to have a little chip on the braking surface. Maybe in two areas. They are uneven dents with rough edges that must have been from the uni hitting a rock during a bail/UPD/fall. I was experimenting with putting brakes on the 29er and I can definitely hear/feel when the pads go over the chip on the braking surface. What are my options here? Can I sand the problem area down some? Do I just need to deal with it or is there something I can do to make braking better? The chips are very small, and I never noticed them before adding the brake (I kind of want one now that I am using a geared 29er off road). __________________ -James

2010-05-10, 10:11 PM	#3
1-wheeled-grape Scott Join Date: Oct 2007 Location: Colchester, Essex, England Age: 20 Posts: 4,408	once they're sanded i doubt you'd notice them, especially if your muniing. __________________ This is no longer a blank signature, that is all

2010-05-12, 12:48 AM	#7
ezas Registered User Join Date: Jun 2008 Location: Placerville, CA Age: 55 Posts: 895	Use a black emery board (fingernail file). Get a course/medium. And if you want a Pink Fine. Any Walmart/Wagreens/RiteAid will have them. Using a fingernail emery board with keep your braking surface true and flat and you will only knock down high spots. Put some masking tape on both sides of the rough areas so that you only sand where you need to. __________________ The only constant in nature is Dr House's epiphany 10 minutes before the end of each show.

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2010-05-10, 10:08 PM	#2
kb1jki Unicycles on my mind... Join Date: Sep 2008 Location: North of Boston, MA Age: 40 Posts: 868	sand paper and then emery cloth should help. that's where I'd start. remove the rough edges so they don't chew up your pads. You'll probably feel the thump as it goes around, but it shouldn't bother anything beyond your nerves. check around the damaged areas to see if there are any cracks or hairline fractures coming from the damage. Don't try to unbend aluminum.

2010-05-11, 03:12 AM	#4
Max_Dingemans Pedal Pedal Crash Join Date: Oct 2002 Location: Minneapolis, MN Posts: 1,391	Just using the brake is a lot like sandpaper. You probably won't notice the chips after a few long downhills riding the brake.

2010-05-11, 05:06 PM	#6
kb1jki Unicycles on my mind... Join Date: Sep 2008 Location: North of Boston, MA Age: 40 Posts: 868	I try not to be that bad. I feel guilty enough milking the disk thread to death, but I try to keep that stuff in there. I feel most would benefit from disks, but that's another thread!

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