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Wheel description Sigma Elastic rubber tread; hardness 70 +/-3 Shore A. Aluminium centre. Ball bearing bore The housing is obtained by moulding and contains ball bearings series Z. Axle Axle composed of ground steel bush with bolt according to UNI EN 24017 and nut according to UNI EN 24032. Swivel top plate bracket type P Swivel top plate bracket type P. The plate, the ball rice ring and the fork are made of pressed steel zinc plated finish; swivel actions: double ball greased race with dust protection seal made of nylon. The king pin is made of steel bolt series 8.8 and nut. |