Seismic Speed Vent Defcon formula longboard wheel description:
Durometer: Bubblegum 77a Defcon, Mango 78.5a Defcon, Mint 81.5a Defcon
Contact Patch: 54mm
Core Placement: OffsetWeight per Wheel: 6.1 oz or 172.93 g
The 73mm by 54mm Seismic Speed Vent is molded around our proprietary weight-saving Energy Conversion (EC) hub – arguably the most advanced hub on the market. The 73mm diameter gives it the roll speed of a larger wheel, while the weight-saving hub adds the quickness and agility of a smaller wheel, as well as enhanced rebound. Combined with lips designed for pure grip, the Speed Vent is utterly unique among high-end wheels. Breakthrough performance for DH, GS, and beyond. Choose Defcon formula for explosive speed and rebound with smooth, predictable grip-to-slip.
If you want to know more about Seismic's Defcon wheels, here is a great review
from our friends over at Silverfish.