A smooth tire will have the greatest contact area and the best grip on a hard surface. Unfortunately it will also be most prone to hydroplaning. On a regular vehicle that has to be able to travel in any weather smooth tires can't be used, but bike tires are narrower and better at cutting through the water to the surface below so they don't need much treads to do OK in rain.
Road bikes have thin tires because they are operating on smooth surface and should be light.
If you want traction you need the tread. Smooth tires are only used for racing.
tire tread is for better traction on slippery surfaces smooth tires are for racing at hi speed
to move easily on rough suface like roads etc...
Bikes styles all have different tires to suit terrain. There are road racing tires, cruising tires, off-road tires and many different wheel sizes too.
On a smooth surface the best traction and lowest rolling resistance is had from smooth tires. On an uneven or soft surface, like mud and sand a treaded tire offers the best traction, and the poor rolling characteristics is a trade of you have to live with.
Hybrids, Dutch AKA City bikes, A rigid MTB with smooth tires.
Everybody that races dirt bikes "started" racing dirt bikes at some point.
The time when people want four wheeler tires is when they going to be riding on ATV bikes. Most of these wheels are useful for riding on the dirt with the bikes, giving off smooth, and clear turns.
yes haro makes a big range of racing bikes
Treadless racing tires called are slicks.
Google can't find an eon bike.