Green’s Dictionary of Slang

treads n.2

(Aus. teen) ‘sandals with brightly coloured suede uppers and soles cut from car tyres’ Taylor (2004) p. 49/1.

[Aus](con. 1960s-70s) T. Taylor Top Fellas 49/1: Treads [...] were an equally popular and unlikely choice in sharp footwear, unlikely because they were very much part of the surfie uniform.