Piece of cardboard attached with clothes peg to bike frame, to hit wheel-spokes and make "stupid" noise?
Spokey-dokeys

Seems we all had similar toys. I had meccano and lego. Grandad taught us poker, gin rummy and pontoon, and an old couple across the road taught us Newmarket, Canasta and chess. These were ideal past-times in Manchester... oh, and was good at jumping in puddles
