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Mystery Hole on seat tube?

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Old 05-06-16, 12:00 PM
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Mystery Hole on seat tube?
What is that circular hole on this guru seat tube for? I saw the pic, and just get curious?
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Old 05-06-16, 12:15 PM
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It's for Di2. And possibly other wired electro-shifty components.
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Old 05-06-16, 12:19 PM
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Thanks Lesters.
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Old 05-06-16, 01:32 PM
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see: https://en.wikipedia.org/wiki/Trepanning
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Old 05-06-16, 03:19 PM
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It's to let the radio waves in and out for E-Tap.
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