Deinonychus
FRF Addict
I just measured. Approx 16 3/4" radius measured horizontally.
I did likewise and came to just less than 17" from the edge of the tread to the center of the center cap.
There could be a problem when it comes to the precise measuring guidelines.
The tire has a "crown" in the middle, but if measurement is taken at the edge of the tread, it is clearly less than 17".