Cycling in and around Birmingham England
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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