Trix 62430 - Curved Track R-4, 30 degrees
Radius 579.3 mm / 22-13/16", also referred to as R-4 Radius.
One piece curve 30°. Use 6 pieces for half a circle, 12 pieces for complete circle.
Single Piece
Parallel curve to Radius R3 with a spacing of 64.3 mm / 2-9/16". 12 sections of track form a circle with an outer diameter of 120 cm / 47-1/4".