abec 7 bearings
Precision ball bearings in tolerance grades ABEC-5 and ABEC-7 are recommended for applications where high speed and/or extreme running accuracy is required.
These bearings have the same nominal external dimensions as equivalent size ABEC-1 grade bearings; however, the running characteristics and external dimensions are held to closer tolerances.
ABEC Bearings Ratings - What does ABEC mean for Skateboard Bearings?
What does ABEC mean? Skateboard bearings often have an ABEC rating, and skaters are often confused about what that means. What are ABEC bearings? Is the ABEC bearing rating important?
Answer: ABEC stands for Annular Bearing Engineers' Committee, and is the American method for rating the accuracy and tolerance rating of bearings. ABEC standards are set by the American Bearing Manufacturers Association (ABMA).
So what does that mean? Well, bearings are used for all kinds of things, not just skateboard wheels. The higher an ABEC rating, the more accurate and precise the bearing is. When companies make bearings, sometimes they cheaply slap them together, and sometimes they are very carefully designed and assembled so that there is as little space as possible between the parts. When bearings are used in expensive and important machines, companies will spend hundreds of dollars on just one bearing - it has to be perfect!
But for skateboarding, we use much less precise bearings. This is because they are cheaper, and because with all the slamming and sudden starts and stops, a really expensive, delicate bearing would get ruined.
ABEC ratings are only odd numbers, and start with ABEC 1:
•ABEC 1 is the most crude, the least precise, the most durable and the cheapest.
•ABEC 3 is what most cheap complete skateboards come with, especially skateboards from China. ABEC 3 bearings will work for most skateboarding, but won't roll very smoothly or fast.
•ABEC 5 bearings are the norm in skateboarding. You get a reasonable amount of speed, and at a reasonable cost. However, there are lots of people who argue that the skateboarding industry is lying, and that most ABEC 5 skateboard bearings you see aren't actually built to ABEC 5 standards...
•ABEC 7 bearings would be very fast and smooth, but very expensive. Plus, you start to run the risk of needlessly damaging them if you skate hard or aggressively. Also, if you are buying cheap ABEC 7 bearings made in China, you are probably being lied to (read The Truth about Skateboard Bearings.
•ABEC 9 and higher bearings would be ridiculous to use in a skateboard, unless you are doing downhill luge style skating, or something else where your goal is to go insanely fast. If you aren't spending a fortune on these bearings, then don't trust that they are in fact ABEC 9!
