Until now … probably not!
CII have designed the sealed bearing unit which is about to make your life a whole lot easier! The CII Sealed-Unit has negligible drag at the rim to overcome traditional causes and failure in generic rollers.
CII . Sealed Unit
The endcap is CNC machined, seating the bearings perfectly within the end cap. The inside is further sealed to negate ingress at the back of the endcap. Furthermore, the internal space between the bearing and axle is secured by a special cap containing additional lubricant (grease), to prolong the life of the bearing.