Ah the 70s! Flared trousers, platform shoes, the disco craze and in Japan the Dekochari デコチャリ
The dekochari (i.e. bike decoration to resemble giant trucks) was inspired by another craze: the Dekotora (Truck Decoration). Think of Mr T in a truck form, and you'll get the idea: an over the top decorated giant truck - very bling bling! . When this craze happened the kids transferred it to their bicycles resulting in giant over the top decorated bicycles to resemble those trucks! Plywood, lights, and hi-fi systems! all packed on a bicycle!
A dekochari gang!
Scraper Bikes - Oakland
Nowadays, we still see some bike pimping. Check out the Original Scraper Bikes