OH MY GOD! I FOUND THE PROBLEM! THE BIKESHOP WHERE I PURCHASED MY TREK SPEED CONCEPT, THEY INSTALLED ONE OF THE BRAKE SHOES BACKWARDS. THERE ARE ARROWS POINTING WHICH DIRECTION THE BRAKE HOUSING AND SHOE SHOULD BE POINTING. HENCE, YOU HAD ONE SHOE THAT WAS POINTING IN THE CORRECT DIRECTION AND THE OTHER WAS BACKWARDS. HOWEVER, WITH THE SAME WRONG SETUP, MY 808'S WERE NOT PULSATING AT ALL. I WAS USING MY OLD 808 PADS BUT THEY WERE WORN DOWN PRETTY BADLY SO I REPLACED THEM WITH THE ZIPP SUPER 9 WHICH BY THE WAY ARE THE EXACT SAME PADS. THE OTHER SIDE WAS INSTALLED CORRECTLY.
ONCE I REPLACED THE PADS WITH NEW ONES, AND HAD BOTH SHOES POINTING THE RIGHT DIRECTION, AND I ALSO DID NOT TOE THEM IN AS INSTRUCTED BY ANOTHER FORUM MEMBER, NO MORE PULSATING AND IT IS SILKY SMOOTH.
THE FEW LESSONS LEARNED FROM THIS:
1. PROBABLY NOT A GOOD IDEA TO USE ALREADY USED PADS ON A NEW WHEEL.
2. BE SURE THE BRAKE PADS ARE POINTING IN THE RIGHT DIRECTION
3. A RIM THAT IS SLIGHTLY OUT OF TRUE AND/OR AN EXCESS AMOUNT OF CARBON LAYUP SHOULD NOT CAUSE BRAKES TO PULSATE. MY RIMS ARE A BUSINESS CARD WITH OUT OF SPEC BUT ONLY ON ONE SIDE.
4. NEVER ASSUME YOUR BIKE SHOP INSTALLED ANYTHING ON THE BIKE CORRECTLY.
5. THE PRELOAD WHETHER LOOSE OR TIGHT DID NOT EFFECT PULSATING. I TRIED IT BOTH WAYS, LOOSE AND TIGHT SAME ISSUE. I HAVE DONE IT RIGHT BY TURNING IT UNTIL IT STOPS, THEN BACKING OFF 1/8 TURN. THERE IS TINY AMOUNT OF PLAY WHERE YOU CAN WIGGLE RIM BACK AND FORTH BUT ONCE YOU SIT ON BIKE, IT IS TIGHT.
I will have to call Zipp and apologize to them for putting them through the paces. Yes i must have drove them nuts but after paying a ton of money for this wheel and then to watch my tribars shake back and forth every time i stop was irksome.
ONCE I REPLACED THE PADS WITH NEW ONES, AND HAD BOTH SHOES POINTING THE RIGHT DIRECTION, AND I ALSO DID NOT TOE THEM IN AS INSTRUCTED BY ANOTHER FORUM MEMBER, NO MORE PULSATING AND IT IS SILKY SMOOTH.
THE FEW LESSONS LEARNED FROM THIS:
1. PROBABLY NOT A GOOD IDEA TO USE ALREADY USED PADS ON A NEW WHEEL.
2. BE SURE THE BRAKE PADS ARE POINTING IN THE RIGHT DIRECTION
3. A RIM THAT IS SLIGHTLY OUT OF TRUE AND/OR AN EXCESS AMOUNT OF CARBON LAYUP SHOULD NOT CAUSE BRAKES TO PULSATE. MY RIMS ARE A BUSINESS CARD WITH OUT OF SPEC BUT ONLY ON ONE SIDE.
4. NEVER ASSUME YOUR BIKE SHOP INSTALLED ANYTHING ON THE BIKE CORRECTLY.
5. THE PRELOAD WHETHER LOOSE OR TIGHT DID NOT EFFECT PULSATING. I TRIED IT BOTH WAYS, LOOSE AND TIGHT SAME ISSUE. I HAVE DONE IT RIGHT BY TURNING IT UNTIL IT STOPS, THEN BACKING OFF 1/8 TURN. THERE IS TINY AMOUNT OF PLAY WHERE YOU CAN WIGGLE RIM BACK AND FORTH BUT ONCE YOU SIT ON BIKE, IT IS TIGHT.
I will have to call Zipp and apologize to them for putting them through the paces. Yes i must have drove them nuts but after paying a ton of money for this wheel and then to watch my tribars shake back and forth every time i stop was irksome.
Last edited by:
marathonrunner: Jul 8, 17 17:43