GT1 produced some of the most accurate gear and pinions in slot racing.

72 pitch:
Spurs 42t 2', 43t 2', 42t 16', 43t 16' 3/32 axle
Pinions 6t (1.5mm),7t (1.5mm), 8t, 9t, 10t, 11t, 12t
EDM Pinions 7t 2mm