wheel center: nylon black
bearing: roller bearing
galvanized sheet steel housing, pivot bearing with a double ball race, bolt hole fitting by bolt hole Ø 13 mm, housing with material strength 2.5 mm (fitting) and 2.5 mm (fork), clearance between the fork 52 mm, wheel rim made of nylon with a tread made of vulcanized elastic tyre (approx. 75° Shore A) blue colored, hub width 50 mm, roller bearing, screwed wheel axle (incl. all axle material).