ll the wheels are of the same size, except in some skates, where the first front wheel maybe slightly smaller compared to others. These also have a brake – sometimes in near the toe and sometimes near the heel. Exerting pressure on that brake will make the skate slow, and will help you stop.
Bearings are the ones which allow the wheels to rotate freely. Typically, 2 bearings are used per wheel. These bearings fit into openings in each side of the wheel hub. When making the purchase decision, people generally go in for in line skates with expensive urethane bearings. However, this is a myth. Clean bearings help increase the speed; which doesn’t depend on how cheap or expensive they are.
To prevent injuries, and to provide better stability, brakes are very important. Hard rubber bakes are either located below the toe or below the heel. E.g. for brakes below the heel, a person raises his toe to stop the ride. Learning how to apply brake is critical. Some in line skaters feel heel brakes can interfere with cross-turn. So, they use different techniques like T-stop to stop themselves.
Inline skates also come with different set-ups. All 4 wheels may not be of a similar size, frames maybe different, or the alignment of wheels and frames may be different. The common types of set-ups are freestyle, tri-rocker, anti-rocker, hi-lo hockey set-up, aggressive set-up, front rocker, full banana rocker or flat set-up (the most common one). These again depend on the speed the skater wants to achieve, the experience level and the type of surface he is skating on.