Märklin 24530
Curved Track R5 = 643.6 mm / 25-5/16". Curve 30° per piece
Radius R5 = 643.6 mm / 25-5/16". Curve 30°. Parallel curve to Radius R4 with a spacing of 64.3 mm / 2-9/16". 12 sections of track form a circle with an outer diameter of 133 cm / 52-3/8".