evidently, the sequential pattern is to provide a quiet ride... 
from 
http://www.americanmototire.com/AV41/AV42 VENOM R RADIAL
    * ADVANCED CASING TECHNOLOGY FOR LOW ROLLING RESISTANCE, COOLER RUNNING, AND HIGH MILEAGE
    * UNIQUE SEQUENTIAL TREAD PATTERN PRODUCES A QUIET RIDE
    * MULTIARC TREAD CONTOUR FOR LIGHT, NEUTRAL TURN-IN AND CORNERING STABILITY
    * SIZES AVAILABLE FOR CUSTOM WIDE WHEEL APPLICATIONS
    * 250 SERIES TIRE RECOMMENDED RIM SIZE IS 9.00" (8.50"MIN - 9.50"MAX); OVERALL TIRE WIDTH IS APPROXIMATELY 10"; TIRE DIAMETER IS APPROXIMATELY 25.9"
    * 300 SERIES TIRE RECOMMENDED RIM SIZE IS 10.5" (10.0"MIN - 11.0"MAX); OVERALL TIRE WIDTH IS APPROXIMATELY 11.8"; TIRE DIAMETER IS APPROXIMATELY 26.3"
    * 330 SERIES TIRE RECOMMENDED RIM SIZE IS 12.0" (11.5"MIN - 12.5"MAX); OVERALL TIRE WIDTH IS APPROXIMATELY 13.1"; TIRE DIAMETER IS APPROXIMATELY 25.0"
    * H-RATED FOR SPEEDS UP TO 130MPH, V-RATED FOR SPEEDS UP TO 149MPH, OR W RATED FOR SPEEDS UP TO 168+ MPH