R2 = 437.5 mm / 17-1/4" / 24.3 degrees (same as a turnout branch from 24611 and 24612 turnouts).

Charlie Says: The radius of this track is identical to the radius of the 24230 piece of track. The difference is the length. This piece is slightly shorter, and only curves 24.3 degrees, whereas the 24230 curves 30.0 degrees. OK, in case you used to sit in the back of the classroom during trig: 360 degrees makes a full circle. 12 pieces of 24230 make a full circle (12 x 30 degrees=360 degrees).