Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  

Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Thread Tools Search this Thread
Old 02-20-06, 02:01 PM   #1
bum bike
Thread Starter
chajmahal's Avatar
Join Date: Sep 2005
Location: San Diego, CA
Bikes: '85 Woodrup Giro-Touring, 87 Centurion LeMans RS (2), 78 Centurion LeMans, 77 Centurion Super LeMans, 2001 Jamis Quest, 1970 Raleigh Grand Prix
Posts: 228
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Ceramic brake pad cause damage to alum rims?

I bought a used road bike with Mavic aluminum rims and Gigapower ceramic brake pads model GB-355. The rims and pads were new with no marks or wear. The previous owner had just overhauled the bike and spend some coin but then had an injury.

After a few rides I noticed the braking had gone all to h3ll and the pads made an odd scraping/grinding noise on the rims. I took the wheel off and was about to sand the glaze off the pads and noticed shiny little aluminum flakes embedded in the pads. I picked them out with the point of a push pin, slapped the wheels back on and then after a few rides the same thing happened. Little aluminum flakes embedded in pads causing weird noise and poor braking.

At this point I noticed that the rim had accelerated wear to the surface and what looks like the same aluminum flakes stuck on the surface of the rim. Like they were scraped off and then deposited elsewhere along the rim. I looked on the manf website and found the pads and that they are indeed meant for aluminum rims. On the Q&A page I found this:
Q: There are some particles, like aluminum flakes, sticking to the rubber compound. Does this mean that the rubber damages the rim??
A: Under normal circumstances, the rim eventually will wear out by any kinds of material. But if the brake pads contain metal they will wear out faster. Our compound contains no metal so it will cause less damage to the rim. A lot of our customerís rims are produced by join pin method, the aluminum flake accrue when the surface of joint area isnít smooth and after the pad goes past that area the aluminum flakes stick into the rubber. This can happen with any brand of brake pads. Consumers need to remove dirt, rocks, or other material that may stick in the rubber during the ride to ensure the quality of rim and proper use of the brake pads and system.

Anybody have an experience with this brand? Or experience with something similar in another type of ceramic or other compound pad?
chajmahal is offline   Reply With Quote
Old 02-20-06, 03:37 PM   #2
Senior Member
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 30,238
Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 639 Post(s)
Brake pads intended for ceramic coated rims are death on regular uncoated alloy rims. Get rid of them QUICK!

When Shimano first introduced Dura Ace "cartridge type" brake pad holders they came with pads intended for ceramic rims and these very quickly developed a reputation for being extremely distructive to plain Al rims. Shimano made a design change almost immediately and there were warnings all over the various bike forums about how to identify and avoid these pads.
HillRider is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

All times are GMT -6. The time now is 03:55 AM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.
  • Ask a Question
    get answers from real people!
Click to start entering your question.