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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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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 ...


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I happen to own two almost identical mountain bikes other than frame. One aluminum (Orbea) with Niner carbon font fork. And the other an all carbon Niner with Niner carbon front fork. I was looking for a Niner carbon frame and found a whole bike at such a deal I bought it. Both are single speed and tubeless. The all carbon has 2.1 tires compared 2.25 on ...


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These 38/50/60/88 numbers are the 'depth' of the wheel's aerodynamic rim, in millimeters. Let's take 38 for example. This means that from where the tire meets the wheel, the rim extends an additional 38 millimeters towards the hub. When you see 88, that means the rim extends 88 millimeters from the tire. Why does that matter? One of the biggest benefits of ...



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