The volcanic creation of the Canadian Shield took place during the Earthâs earliest geologic era, the Precambrian, which includes the earliest 80% of Earthâs existence. The Precambrian era ranges from about 5 billion to 570 million years ago.This process continues today in such places as Hawaii.he volcanic creation of the Canadian Shield took place during the Earthâs earliest geologic era, the Precambrian, which includes the earliest 80% of Earthâs existence. The Precambrian era ranges from about 5 billion to 570 million years ago.
608 STANDARD. The most common bearing size is the â608.â Characterized by an 8mm core, a 22mm 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.
Inline Skate Bearings Part numbers and sizes. Please sign in to like this Guide. Inline Skate Bearings Part numbers and sizes a guide by Nextridge Home of Predator Speed skate bearings: The 3 digit numbers as shown below are typically the base part of the number on the side of the bearing shield or seal. These 3 digits represent the basic 3 dimensions as shown below.