How do I tell what size bearings are in my wheels? Last Updated: 08/11/2011
There are 3 very easy ways to check the size bearings you have.
1.Look at the stamping on the shield of your existing skate bearing. Most will be stamped with 608. This means you have 8mm. If stamped with 627, you have a 7mm bearing.
2.You can also tell by the size of the wheel nut. A 9/32" nut will indicate a 7mm bearing. A 5/16" nut will indicate a 8mm bearing.
3. Take a number 2 pencil using the eraser side of the pencil. Try sliding the bearing onto the pencil. If it is to big to fit through the center it is a 7mm bearing, but if the same pencil slides right through you have a 8mm bearing.
These are 3 very easy ways to figure out what size bearings are in your wheels.