I was looking at bearings and was saying something about ABEC, what does that mean?
and what’s the difference between YYF speed and spec bearings?
i think abec is the grade i think like abec 7 is good and abec 1 is bad
yyj makes the speed bearing and yyf makes the spec imo i like the speed bearing between the two but overall i like 10 balls or ckks the best( i despise ct bearings)
Abec is a rating that has absolutely nothing to do with yoyo’s.
I don’t want to type it so just read here.
http://www.seskate.com/technical/ABEC.html
Isn’t it just a rating of how smooth and long spinning a bearing is? Abec7’s are nice, smooth, and long spinning, as Abec 1’s arent?
http://www.skatelog.com/bearings/abec.htm
http://skateboard.about.com/od/gear/f/ABEC_Bearings.htm
Read those links (and link from those links).
ABEC 1 can handle 38,000 RPMs.
Which you won’t get anywhere near with a yoyo.
To paraphrase the link icthus gave, the ABEC rating has to do with tolerances. How close to spec the inside and outside diameter are. That really isn’t important with yo-yos. The rotating accuracy of bearings is extremely important in a precision tool such as a lathe but doesn’t matter on a yo-yo.
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That ABEC rating makes me feel dizzy.
you forgot to say that YYJ speed bearing is stainless steel…it is a good thing:P
ABEC= Annular Bearing Engineering Corporation or something similar.
committee
So is the Yoyofactory SPEC bearing. 
i didn’t know that…thanks for information 