Let them play, the only mandatory thing is that they change the handlebar, the rest must be as "safe" as other polo bikes.
Call them donkey bikes, a lot of polo players are playing on donkey bikes (mostly beginners). Donkey? Yes, because the example of showing up with elephants at a horse polo game is just stupid (this would be a motorcycle at a bicycle game) so a donkey is more suitable. The players eventually notice that their donkey is not fast, etc. enough for the game and change their setup. What results in a "proper" polo bike. Everyone started on donkeys. Some still do and kick your ass, deal with it.
Let them play, the only mandatory thing is that they change the handlebar, the rest must be as "safe" as other polo bikes.
Call them donkey bikes, a lot of polo players are playing on donkey bikes (mostly beginners). Donkey? Yes, because the example of showing up with elephants at a horse polo game is just stupid (this would be a motorcycle at a bicycle game) so a donkey is more suitable. The players eventually notice that their donkey is not fast, etc. enough for the game and change their setup. What results in a "proper" polo bike. Everyone started on donkeys. Some still do and kick your ass, deal with it.