Excellent fun!
Stirling Bike Club used to play this regularly until we all grew up.
Kenny at Johnstone Wheelers is Scotland's bikepolo guru and will probably bring down a van full of players (and gear) at the merest sniff of a game. We even had a guy fly all the way from Arizona to play with us – and one of the kids got to represent Scotland in an international tournament!
Kit:
Grass field.
Goalposts from jumpers.
Ball from Tesco's/petrol station (one of those promo things they give away during world cups)
Mallets from Kenny / some place in Pakistan.
Bikes with cut-down handlebars from recycling centre
(we didn't use fixies but the keenies use custom-built fixies)
Lots of spare front wheels.
Rules:
Mallets must be held in the right-hand.
No sharp bits on the bikes.
Brakes are optional
Enjoy!