deep groove bearings 6200zz 6200 2RS 6200RS

STEEL
Bearings are circular in shape with flat sides. Each one houses seven or eight lubricated balls (ceramic bearings have nine), which are designed to disperse the weight of a load and ease tension between the wheels and the axle. These balls are typically made of steel for durability and economical purposes. For most skateboarders, steel bearings will work fine.

Unfortunately, the energy caused by heavy friction between the axle and the wheels can heat up the metal, causing it to expand and render the bearings ineffective. Be careful to keep your bearings clean, lubricated and dry, and they’ll work better and last much longer. 

ABEC RATINGS
The Annular Bearing Engineering Committee (ABEC), a division of the American Bearing Manufacturers Association, developed a rating system to measure the amount of tolerance – or variation from an exact measurement – in precision bearings, a system that became a standard in the bearing industry. ABEC ratings run from 1 to 9 (odd numbers only), with higher numbers meaning more precise tolerances. Typically, the higher numbers also equate to higher prices.
While the ABEC ratings are certainly relevant in some cases, they were designed to evaluate bearings for use in machinery, not skateboard wheels. Unfortunately, the result is that the tolerances measured do not factor in certain forces exclusive to skateboarding. Therefore, while many skate bearing manufacturers will still provide the ABEC ratings for their products, riders should know that they are not end-all.

deep groove bearings 6200zz 6200 2RS 6200RS catalog: