Bmc road machine.. what the heck is this thing.?!😳

[Bike Dewing]

Good day chaps.. hope you all well..

what is this please.? It’s on the drive side of the frame.. I’m guessing the frame is wireless specific.?! Or is it something completely different..? 🤣🤣

Edited June 26 by Bichael Dewing
The picture would help hey

[guidodg]

for the front dera cable

[Spirog]

Chain catcher

[Bike Dewing]

21 minutes ago, guidodg said:

for the front dera cable

So will accept mechanical or wireless group sets.? 

[Thomo]