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I have a road bike with Shimano Ultegra Di2 6870 goupset. Today it was my first long ride with it and alsmost instantly I noticed that the brake pads are not for carbon rims. I tried searching on the internet brake pads for ultegra 6870 but with no luck. Are other ultegra brake pads compatible with my brakes?

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According to the Shimano groupset page, both brake options for the Ultegra Di2 6870 groupset (BR-6800, BR-6810) ship with the Shimano R55C4 pads, which are designed for carbon rims.

So more than likely, either the brakes are not setup correctly, or the Shimano pads suck.

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Well this morning it was my second time using the bike after the triathlon and it's making a horrible loud noise every time I brake, is that normal maybe at the beginning? because I read somewhere that is a sign that the pads are not for carbon. – SERPRO Jul 14 '14 at 14:36
Is there crud in the pads? Did you replace the original pads? If so, you may have put non-carbon pads on. – Batman Jul 14 '14 at 14:36
I just read in Wiggle: "Pad compound formulated for use with standard alloy rim braking surface" – SERPRO Jul 14 '14 at 14:38
Looks like theres a Carbon (…) and non-Carbon version, so it seems like it might ship with the non-Carbon type. – Batman Jul 14 '14 at 15:19
thanks @Batman, you are right they have for versions.. I bought this on eBay because I need to change the 4 of them.. – SERPRO Jul 14 '14 at 15:38

If you have carbon rims (with a carbon braking surface) you will need appropriate brake pads, so as not to damage the rims. You do not have to use shimano brake shoes- most (possibly all?) rim brakes will take any brand of shoes.

There is a carbon rim insert for Dura Ace, which might fit the ultegra shoes. However if there are no compatible pads for your brake shoes/ rims, you may have to buy a new set of shoes - not especially pricy, and they will come with pads.

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