I just bought a new set of B4 pads off ebay. Are these an older formulation and the C4 is the new one? Or the other way around? What's the difference between the two? I remember many discussions about this years ago but can't find even one mention when I do a Search. There's some reviews of C4 in the Review section but I'd like to know more about the differences. Thanks.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Avid BB7 pads C4 vs B4