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Your bearings are inside little metal rings that fit inside your skateboard wheels. There's only one way to rate bearings at the moment, and it doesn't work well with roller skate bearings. The rating is called ABEC and goes from 1 to 9, but only odd numbers. Unfortunately it was originally developed to rate the bearings in machines, not on skateboards (for more, you can read "What does ABEC mean?".

Therefore, the ABEC rating only rates the precision of a bearing. Plus, the more precise he bearing, the weaker they usually are. Skateboarders take their bearings and abuse them, as normal skateboarding does. Skateboarders want bearings that are both precise and durable, so the ideal ABEC rating for a skateboard is 3 or 5. Smooth enough, but not going to break when you jump on your board. Some roller skate bearings don't even bother with the ABEC rating system. The best thing to do is try some out, ask your friends, or ask the guy behind the counter at the skate shop.

First, you'll want to remove your skateboard bearings. You can clean your nsk bearings without removing them, as I'll show you later, but you won't get them very clean that way. To clean your roller skate bearings well they need to have been removed from your skateboard wheels. Not sure how to do that? Pause for a second and read How To Remove Your Skateboard Bearings. It's quick and easy.

All Wheels require Bearings in order to roll well. Almost all wheels including Rollerskates, Rollerblades, Scooters and Skateboards require 2 Bearings - One on the Inside and One on the Outside. Most Wheels have an inner Spacing between the Bearings of .400 on Average for Skateboards and Blades or .325 and .285 for Indoor Rollerskates. Rollerskates can also use a Different Bearing Size (which can also date back to the 60's and 70's on Early Skateboards) you can find imprinted on the cover of a precision Bearing. If you have an 8MM Axle the bearing Number is 608. If you have a 7MM Axle the Bearing Number is a 627.

In particular, the ABEC rating says nothing about how well a bearing handles axial (side-to-side) loads, which are severe in most skateboard applications. Many companies do not show the ABEC rating, such as Bones Bearings, which makes bearings specifically for skateboarding, often marketed as "Skate Rated". Each nachi bearing usually contains 7 steel or ceramic ball bearings, although other configurations are used as well.

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