Airfoil braking surface?

Livewire unicycles has been doing that for awhile.

http://www.livewireunicycles.com/CokerWheels.htm

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MuniAddict said:

The 36er airfoils are light and strong, but the powder coating, which
covers the entire exposed part of the rim, seems to make for a less
than ideal braking surface.

I've heard of others taking the time to expose the sidewalls for better
braking, but my rim seems to work alright with the magura brake. I
guess, if it's not broken, don't fix it...

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My Magura brakes were making some awfully loud noises when engaged on
the powder coated airfoil rim. I figured they would probably wear in
and quiet down after enough riding, so I ignored it for a while.

After weeks of riding lots of hills, and hearing no signs of my brakes
becoming any quieter, I hit the search function hard to see if anyone
on here had dealt with similar issues in the past. I found a couple
threads regarding the issue and read through them all. Some people
recommended trying different brake pads, others advised letting the
brakes wear in some more, and a few people talked of removing the
powder coating. The Livewire removal service was mentioned, but I did
not want to go without my unicycle for longer than necessary, and
someone mentioned that they had removed the powder coating from a sun
rim's braking surface using an orbital sander.

This is what I did. I used 150 grit paper until I could see a bit of
the aluminum shining through the powder coating, and then switched over
to 220 grit to finish the job. The whole process took about an hour. I
like my rim’s new look, and my braking is now a silent process.

--Danny

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Danny Allen said:

My Magura brakes were making some awfully loud noises when engaged on
the powder coated airfoil rim. I figured they would probably wear in
and quiet down after enough riding, so I ignored it for a while.

After weeks of riding lots of hills, and hearing no signs of my brakes
becoming any quieter, I hit the search function hard to see if anyone
on here had dealt with similar issues in the past. I found a couple
threads regarding the issue and read through them all. Some people
recommended trying different brake pads, others advised letting the
brakes wear in some more, and a few people talked of removing the
powder coating. The Livewire removal service was mentioned, but I did
not want to go without my unicycle for longer than necessary, and
someone mentioned that they had removed the powder coating from a sun
rim's braking surface using an orbital sander.

This is what I did. I used 150 grit paper until I could see a bit of
the aluminum shining through the powder coating, and then switched over
to 220 grit to finish the job. The whole process took about an hour. I
like my rim’s new look, and my braking is now a silent process.

--Danny

Post pics please!😄

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This might be dumb, but on my 29er, I've made the braking surface all
lovely and shiny metal, by riding through gritty mud lots and using the
brake.

I know you'll find it hard to find much mud, but maybe you could
replicate this by sticking some sandpaper on the pads, and riding along
with the brake loosely on.

Joe

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i want to do the sandpaper trick, but i want to know what it will look
like when i'm done? will it be [censored] bare aluminium with black dodgily
around it or a nice stripe or what?

if anybody has pics this would be really helpful

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Danny Allen said:

My Magura brakes were making some awfully loud noises when engaged on
the powder coated airfoil rim. I figured they would probably wear in
and quiet down after enough riding, so I ignored it for a while.

After weeks of riding lots of hills, and hearing no signs of my brakes
becoming any quieter, I hit the search function hard to see if anyone
on here had dealt with similar issues in the past. I found a couple
threads regarding the issue and read through them all. Some people
recommended trying different brake pads, others advised letting the
brakes wear in some more, and a few people talked of removing the
powder coating. The Livewire removal service was mentioned, but I did
not want to go without my unicycle for longer than necessary, and
someone mentioned that they had removed the powder coating from a sun
rim's braking surface using an orbital sander.

This is what I did. I used 150 grit paper until I could see a bit of
the aluminum shining through the powder coating, and then switched over
to 220 grit to finish the job. The whole process took about an hour. I
like my rim’s new look, and my braking is now a silent process.

--Danny

I had the same loud squealing issue. I just turned the leading edge of
the pad in towards the rim and that cured it.

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(I removed my tire and clamped the frame in a table clamp for this, and
it was not a 36" rim but a 24"😉

I trued my rim laterally to within 5 thousandths nearly perfect so that
it would sand evenly. Put a fine sanding pad on an angle grinder.
Held the angle grinder steady and positioned it so that it would spin
the wheel at a moderate speed while sanding very lightly and evenly
from ID to OD. I continued until all the powercoat was gone and then
until the seam in the rim was no longer an issue.

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Stop posting and go take a dremel to it... 😄

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tomblackwood said:

Stop posting and go take a dremel to it... 😄

Haha that's EXACTLY what I was thinking! Just use that litte barrel
sanding attachment, which is just about the right size for the side of
the rim!

But that might cause too much "scoring", so maybe something else. I
still think if you could apply paint stripper to the sides, without it
slopping all over the rest of the rime, that would be the cleanest
result.

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Woo how much braking do you need on a coker? I've always found the stock
airfoil braking surface sufficient. If you want more power perhaps
stickier pads would be a much quicker and easier way of achieving this.

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kington99

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I have this same problem. Being lazy, I took the pads off and hot-glue
gunned sandpaper strips directly to the pads. So far, it hasn't done
that much (and I can still brake), and I think I need to put new
sandpaper on them. I really should take the tire off the rim and sand
it down...

-corbin

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MuniAddict said:

But that might cause too much "scoring", so maybe something else.

Unless you use gravel as your abrasive, or you do your sanding in the
back of a rally car during a race, it'd be hard to score the rim beyond
the point of no repair.

Even then, scoring improves the function of the brake. What do you
have to lose?

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Oh, they do indeed have enough braking power. It's just that everyone
within three city blocks will hear you comming. ...and sanded mine
down, and it helped, but they're still quite loud.

kington99 said:

Woo how much braking do you need on a coker? I've always found the stock
airfoil braking surface sufficient. If you want more power perhaps
stickier pads would be a much quicker and easier way of achieving this.

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Quoted message said:

<> Unicycle for (reducing the) Buddha <><

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mscalisi said:

Oh, they do indeed have enough braking power. It's just that everyone
within three city blocks will hear you comming. ...and sanded mine
down, and it helped, but they're still quite loud.

Have you tried toeing out your blocks? I've not had any noise problems
with mine on my N36 or muni but know maguras are reknowned for it,
setting the blocks so that the front edge is further away form the rim
than the rear edge can help. Having said all that an airofil with a
bare alloy brake surface must look pretty cool.

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kington99

Dave

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I haven't, mostly out of laziness. I'll give it a shot.

kington99 said:

Have you tried toeing out your blocks? I've not had any noise problems
with mine on my N36 or muni but know maguras are reknowned for it,
setting the blocks so that the front edge is further away form the rim
than the rear edge can help. Having said all that an airofil with a
bare alloy brake surface must look pretty cool.

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mscalisi

Quoted message said:

<> Unicycle for (reducing the) Buddha <><

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kington99 said:

Have you tried toeing out your blocks? I've not had any noise problems
with mine on my N36 or muni but know maguras are reknowned for it,
setting the blocks so that the front edge is further away form the rim
than the rear edge can help. Having said all that an airofil with a
bare alloy brake surface must look pretty cool.

i tried this and it didn't help mine.

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