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I took some tools with me on holiday to allow me to replace tyres and inner tubes on my holiday bike, so I took the opportunity to remove this thing from the frame just below the saddle. It's been bugging me for years. I've always assumed it's some sort of lock attachment, but it seems massively over-engineered for that. Maybe it's for a trailer? The protruding section in the bottom right-hand corner slides in and out by about 5mm for no obvious purpose. The two holes you can see in the top on the left and right do not go all the way through. Does anyone know what it's for? I've never found any use for it.

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Comment by Simon on July 30, 2017 at 11:28

Im guessing that its for fitting a kid's seat.  But i could well be wrong.

Comment by Ryan Stait on July 30, 2017 at 12:17
Definitely a child seat fitting.
Comment by Kim on July 30, 2017 at 12:24

Looks like a variation on the Hamax-style mount:

Comment by Robert on July 31, 2017 at 15:24

Thank you for enlightening me.   Now I know why this thing is so hefty.   I've not seen a child seat kicking around in the bike garage in all the years I've been using this bike, so I guess it parted company from its mount a long time ago.

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