1975 Mattel Hot Wheels Catalog
Mattel launched the HotWheels brand in 1968 and the free wheeling 1:64 scale muscle cars became a household world by the early 1970s.
By 1975, the brand was doing what it does best, creating great looking cars and complicated racing playsets, a formula they still use today.
Awesome wayback moment seeing those catalog pages, thanks !
Factoid: The 1975 group shown there, Motor Cross 1 and Street Eater were the only dedicated HW motorcycles produced by Mattel until the 1997 release of the Scorchin' Scooter model.
Mattel did produce RRRumblers motorcycles from 1971 to 1973 but such never were considered 'true' Hot wheels.