La description
MATERIALS
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.
CERAMIC
Skate companies recognized a need for bearings that were less
affected by heat energy and began offering ceramic bearings for
more discerning riders. Ceramic bearings, made from a compound
called silicon nitride, are smoother and harder than their steel
counterparts. This means much less friction to begin with (these
bearings have little need for lubricant); however, should friction
occur, the ceramic material doesn’t expand, so there is no effect
on the skateboard’s performance.
As usual, higher performance comes at a higher price; but many
skaters will tell you that ceramic bearings are well worth the
premium.
SIZES
**8 STANDARD
The most common bearing size is the “**8.” Characterized by an 8mm
core, a *2mm outer diameter and a 7mm width, these bearings are the
industry standard and match up with nearly every skate wheel out
there.
NON-STANDARD Of course, there are exceptions to every rule.
Rarely, you’ll come across a wheel that is designed for use with a
non-standard bearing. This is not common, but it’s something to
keep in mind.
There are also mini-bearings that can be used with the standard **8
bearing hub, but they require a sleeve to make them compatible.
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.
| Pays: |
China |
| N ° de modèle: |
608
|
| Prix FOB: |
1.55 ~ 16 / Piece (Negotiable)
Obtenir le dernier prix
|
| Localité: |
China |
| Prix de commande minimale: |
1.55 per Piece |
| Commande minimale: |
50 Piece |
| Packaging Detail: |
according to customer requirment |
| Heure de livraison: |
15-25working days |
| Capacité de Fournir: |
2000 Box per Day |
| Payment Type: |
T/T |
| Groupe de produits : |
- |
