To get better traction on soft surfaces.
Your question is too broad. There are many American manufacturers. Some specialize in BMX bikes, some mountain bikes and some road bikes.
Yes A Bicycle uses Wheels and the Axles Hold The Wheels Up Plus Some Bikes Have Levers
Bikes and scooters both have 2 wheels
half of 115
What kind of wheels GT bikes have depends on the model of bike, the new GT GTR Series 2.0 made in 2012, for example uses Schwalbe Lugano brand wheels.
So you can go forwards and backwards. Why do cars need wheels
They both have wheels
It's probably, but not certainly, meant for 26" wheels.
Most typically, bikes have two wheel, a set, and handle bars. For younger children, bikes can have four wheels so they do not have to worry about balancing.
I did some reserch, and I found out that they were invented around 1950 ish. Silvia Moncancone California
Rotation
You can get bicycle wheels with aluminum rims, from about $150 and up, but solid aluminum wheels gets too chunky to be used on bikes.