# Seismic - 73mm Speed Vent

**Specs:**  
Height: 73mm  
Durometers: 77a, 78.5a, 81.5a  
Formula: Defcon  
Contact Patch: 55mm  
Hub Setting: Offset  
Edges: Square  

Sold in sets of FOUR wheels.  

Poured in **Defcon**™ urethane: Guinness WR speed • directional slide • long-lasting grip • slow, consistent wear

The 73mm by 56mm Seismic Speed Vent is molded around our proprietary weight-saving Energy Conversion (EC) hub – the first tall, wide hub seen in longboarding and still second-to-none. 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 stands in a class by itself.

## Details

- **Price:** 738.0 HKD
- **Vendor:** Seismic
- **Type:** Wheels
- **Tags:** 73mm, 77a, 78.5a, 81.5a, Cruising wheels, Downhill wheels, Downhill/Freeride wheels, Freeride wheels, Freestyle wheels, LDP wheels, Seismic, Sharp&Square, Ungrounded, Wheels

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| 77a | 738.00 HKD | In stock |
| 78.5a | 738.00 HKD | In stock |
| 81.5a | 738.00 HKD | In stock |

## Images

- Seismic - 73mm Speed Vent

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> Source: [SBDW Longboards Hong Kong](https://sbdwlongboards.com/products/seismic-73mm-speed-vent)
> Updated: 2026-04-20