Time Factors for Speed Differentials
Miles per hour = (Gear Development in feet) X (Revolutions per minute) X 0.0114
GD = (MPH x 88) divided by rpm
Time to close gap = Gap in seconds X speed differential factor
Time gained in an attack = attack time in seconds divided by speed-differential factor
Speed Differentials
Constant speed (mph) 1 mph (sec) 2 mph (sec) 3 mph (sec) 4 mph (sec) 5 mph (sec)
12 12 6 4 3  
14 14 7 4.7 3.5  
16 16 8 5.3 4  
18 18 9 6 4.5  
20 20 10 6.7 5  
22 22 11 7.3 5.5  
24 24 13 8 6  
26 26 13 8.7 6.5  
28 28 14 9.3 7  
30 30 15 10 7.5  
32 32 16 10.7 8  
34 34 17 11.3 8.5