Diameter

Upper Shocking Proof

Lower Shocking Proof

Hardness: 8mm

Tip： Clean the bearings after riding in the rain or over a puddle

This is not necessary to clean it frequently, but you may need to check the condition of the bearings after riding in the rain or over a puddle. Because the bearings tend to seize up after a long period of unrotated. This is because the water entering the bearings makes them rust in place, which can eventually seize up.  And please don't apply too much oil to bearings and remember to wipe the oil dry as much as possible when the oil is into the pinion balls due to the oil can generate dust and mud.