205/55/R16 wheel has circumference 1.985m

120km/h= 33.33 m/s => 16.8 turns/sec

if 4 pulse a turn => 67.2pulses/second @120km/h => 14.88ms between pulses.

if 6 pulse a turn => 100.8pulses/second @120km/h => 99us between pulses.