Roaders are one-wheeled red motorcycles with a spiked motocross helmet. They are fast - they can easily outrun Sonic on most difficulties - and when it spots the player's character, it charges at top speed attempting to ram him/her. When near a gap, a Roader can try to jump to the other side. When defeated, it explodes and its wheel starts flying away. Its attack deals very high knockback, but deals the Roader very poor traction, which causes it to slide over. It may also attempt to attack by jumping backwards.
A Subspace Army enemy that looks like a motorized unicycle. It features an off-road motorbike helmet as a head, revealing creepy eyes that peek from under its visor. It attacks using three head spikes and its wheel and is clearly unconcerned with environmental conservation, since it wheels around freely spouting exhaust from its muffler.