wheel center: polyurethane grey
bearing: central ball bearing
threadguard: small nylon threadguard
galvanized and blue passivated sheet steel housing, pivot bearing with a double ball race, bolt hole fitting incl. M12 screw by bolt hole Ø 12 mm, housing with material strength 2.5 mm (fitting) and 2.5 mm (fork), clearance between the fork 42 mm, wheel rim made of polyurtehane with a tread made of robust polyurethane grey colored, hub width 50 mm, central ball bearing, screwed wheel axle (incl. all axle material).