Wheel set 50mm, made of 2 rubber wheels with ball bearing and 1x wheel axle

Wheel set 50mm to replace the polyamide wheels against rubberized ball bearing wheels (housing remains old)
consisting of: 2 x wheel 75 mm with rubber coating and ball bearing + 1 x wheel axle

The advantages:
- better roll properties
-Larger roll resistance especially when moving from the rest position
-unempflindlicher on rough ground and light soiling