This bike has a custom gear cluster. On the trip I had 56/44/34 chainrings and 11,13,14,15,16,17,19,21,23,27 custom cluster (note: big jumps at both high and low ends). Tires are called 369mm,

I use 1340mm circumference to calibrate my computer and get accurate distance measurements. according to google: (1340 mm) / pi = 16.7927263 inches