Dynapar RT80512ZV862C Northstar NextGen RIM Tach 8500 Wheel Ring, 4.5" bore. This wheel ring is part of the Northstar NextGen RIM Tach 8500 system, identified by part number RT80512ZV862C. The 4.5" bore defines the mounting size for proper fit within the RIM Tach 8500 configuration.
