# Seismic - 54mm/57mm Oscar 81a/83a (Defcon)

## **\*\*DIFFERENT SIZE&DURO WITH DIFFERENT PRICES\*\***

**Specs:**  
Height: 54mm / 57mm  
Durometers: 83a (54mm) / 81a (57mm)  
Formula: Defcon  
Contact Patch: 33mm (54mm) / 38mm (57mm)  
Hub Setting: Centerset  
Edges: Round  

Sold in sets of FOUR wheels.  

Seismic’s new All-Terrain street wheel, in the world’s fastest ’thane.  Roll faster, smoother, and more comfortably over inconsistent or rough pavement.  A breakthrough Filmer wheel, too: _Roll further with each push, making shots smooth as silk!_

Poured in Seismic’s proprietary DEFCON – the urethane behind the World Speed Records for both Skateboard (91MPH) and Street Luge (101MPH). _Get ready for a whole new realm of FAST!_

## Details

- **Price:** 428.0 HKD - 468.0 HKD
- **Vendor:** Seismic
- **Type:** Wheels
- **Tags:** 54mm, 57mm, 81a, 83a, Cruise(Soft), Freestyle wheels, Round&Beveled, Seismic, Ungrounded, Wheels

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| 54mm 83a (Mint) | 428.00 HKD | In stock |
| 57mm 81a (Mango) | 468.00 HKD | In stock |

## Images

- Seismic - 54mm/57mm Oscar 81a/83a (Defcon)

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> Source: [SBDW Longboards Hong Kong](https://sbdwlongboards.com/products/seismic-54mm-57mm-oscar-81a-83a-defcon)
> Updated: 2026-04-20