Thank you for your very fast reply.
'Was afraid of that. Need a couple of more teeth to get a bit more speed. This is with 26T pinion - would like to be around ~65 km/h:
Differential Ratio: 3.3076923076923075
Transmission Ratio: 1.8333333333333333
Spur Tooth Count: 58
Pinion Tooth Count: 26
Total Voltage: 14.80
Motor KV: 2000
Tire Diameter (inches): 5.55
Spur/Pinion Ratio: 2.23 : 1
Total Ratio: 13.52761 : 1 Rollout: 1.29:1
Total Motor Speed: 29600 RPM
Vehicle Speed: 36.13 mph (58.03 km/h)
It's for this new truck I just completed: