wuts the diff between freestyle and street uni? 
Freestyles are made for indoor use (outdoor too…) and freestyle tricks. They usually have a cotterless hubset and standard sized 20" wheels.
Street unicycles usually have stronger splined wheelsets and allow you to incorporate tricks into your trials riding, which offen means a fatter trials tyre too, but not necessarily.
Both freestyle and street unicycles are commonly set up with short cranks (<137 ) so the rider can get more speed.
freestyle is like tricks + flat
street is like tricks + trials
This is Freestyle: Freestyle Definition in a Video!
This is Street: Street Definition in a Video!
Bye!
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& This is Flatland
Usually done on a trials uni, but now there are some made specifically for this, like the Koxx One Black Domina II