Way back when even the OM was young, we tried all sorts of things. Tanks, fenders, the whole bit.
Some of us tried gears. This is my version of that old bike. The brake lever pulls on the Sturmey Archer hub and changes the gears.
For the UK cats. Sturmey and only Sturmey Archer was used. The Shimano version was considered non-workable
It worked well at the time but eventually became just part of BMX history.
The tank and fenders, well, let's just say it was fun imitating Decoster