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30 mpdb
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1,001 Posts
Per Selle's website video, the SLC's rails are carbon wrapped. I have my SLC clamped down pretty much in the center section with my Thomson post... If you look closely, you can see that the rails curve a little upwards; mine has it, and it looks like yours does as well. Not sure if this is the reason the markings are there, but it is my best guess.
 
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