Abec 7 skate bearings is grinded and polished to a very high precision grade. It means that skateboard bearing abec 7 will have better tolerability, thus may have faster speed and longer service life. A very delicate bearing will reduce friction. The friction generates heat and heat will eventually lead to bearing invalid.
Relatively speaking, the price of 608rs abec 7 is higher, so we don’t recommend newcomers to select such high quality bearing. Most of the time skateboard lovers spend lots of money on high-end bearings, but they don’t well maintain these bearings, which lead to these bearings damaged soon. We want to specially state that high-end abec 7 roller skate bearing needs to be well maintained. Dust prevention measures and proper oil lubrication can both extend bearing’s service life.
As a bearing manufacturer, we’d like to provide more professional data parameters for customers. There are detailed abec-7 parameters on our website, but these parameters are based on professional bearing field. If you just familiar with skateboard, you may not fully understand. Maybe you can know the source of abec-7 by Wikipedia.