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