squeaky brake blocks

[catpaws]

Hi, I train with a dura ace 7900 groupset with ultegra w-6600 wheels.The ultegra wheels are fine with the dura ace brake blocks,but when I fit my DT Swiss RR1450 wheels they screech like hell. I have tried roughning the blocks and cleaning the rims but it doesn't help.Is there perhaps alternative brake block on the market?

[Johan Bornman]

Hi, I train with a dura ace 7900 groupset with ultegra w-6600 wheels.The ultegra wheels are fine with the dura ace brake blocks,but when I fit my DT Swiss RR1450 wheels they screech like hell. I have tried roughning the blocks and cleaning the rims but it doesn't help.Is there perhaps alternative brake block on the market?

Take 600-grit waterpaper and sand the rim brake tracks. Doit with plenty of water present and sand in the direction of travel. The result should be a matte/satin finish. Problems over.... If not, change the pads. Shimano pads are dodgy. Get Koolstop salmon. You'll have to scour the overseas retailers for these since the previous and current Koolstop agents have no clue what treasure they're sitting on.

[catpaws]

I've heard that if a wheel uses cartridge bearings then there is a certain amount of lateral movement on the axel which can lead to vibration causing the squeaking.

[Johan Bornman]

I've heard that if a wheel uses cartridge bearings then there is a certain amount of lateral movement on the axel which can lead to vibration causing the squeaking.

 

That's a fable.

 

Squeaking brakes is caused by the alternative slip/grip cycle caused by the stiction (static friction) of the rubber on the aluminium. If this slip/grip cycle is in the audible frequency, you can hear it. This typically occurs at about 600Hz. One and a bit octaves up from middle-C, if you're a muzo, not a scientist.

 

Sideways movement of the wheel doesn't have an effect on it since today's dual pivot brakes make the wheel conform to the brake line, not the other way around.

 

The only way to remove the slip-grip cycle and thus noise, is to deglaze your rim and blocks. Sandpaper is your friend.

[Delgado]

Take 600-grit waterpaper and sand the rim brake tracks. Doit with plenty of water present and sand in the direction of travel. The result should be a matte/satin finish. Problems over.... If not, change the pads. Shimano pads are dodgy. Get Koolstop salmon. You'll have to scour the overseas retailers for these since the previous and current Koolstop agents have no clue what treasure they're sitting on.

. . . or chat to me. Koolstops are the berries!