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May 2, 2017, 5:59 a.m. -  Andrew Major

In this case the scratches came with the bike. It's a personal ride I borrowed for a few rides. I'd guess shoe wear. I'm a notorious heal rubber and have similar wear on most bikes I ride (not to mention cranks).  I don't follow the second question (longevity) there is no contact between the cranks and frame they just very close. It's just something to keep in mind re. crank shape.

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