What is this hole on the seat stay

Ssscrudddy

New Member
Sep 3, 2022
14
32
Northampton
There's a rubber grommet on both sides of the my Fathom E+ 2 29er (2021) on the seat stay, & the hole is threaded. What's it for please? A rack?
DSC_0967.JPG

DSC_0968.JPG
 

yorkshire89

E*POWAH Master
Sep 30, 2020
468
663
North Yorkshire
I can't see a hole in the same place on the drive side?

Since it lines up with the rotor magnet, was there a different speed sensor mount option on that frame? Assume yours sits on the inside of the chainstay?
 

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