# Seismic - 90mm Megawatt

**Specs:**  
Height: 90mm  
Durometers: 74a, 76a  
Formula: Defcon  
Contact Patch: 53mm  
Hub Setting: Offset  
Edges: Radiused(Outside), Beveled(Inside)  
Weight: 11 oz. (Each)

Sold in sets of FOUR wheels.  

_**More miles per hour, distance per push, and blocks per watt!**_  
• The _world’s fastest urethane_ and _most progressive hub-and wheel engineering_ bring **unparalleled rebound** and **superior energy efficiency** to a **huge** 90mm-diameter shape.  
• Higher top speeds, longer push distances, and extended ESK8 battery life and riding range!  
• Next-level weight-saving Turbine™ hub features _bigger vent holes_ for **more accessible e-board pulley adapter fitting**_._  
• Hub structure ingeniously sculpted for **highly-optimized routing of wheel rebound energy.**  
• Width, edge profiles, and bearing seat offset finely calibrated for **race-style grip** and **more consistent wear**.  
• Half-millimeter **concave running surface** preloads edges, sharpens grip, enhances rebound.  
• Surprisingly **quick, smooth, and agile handling** for its size, even through hard corners. _In a class by itself!_

_**Poured in DEFCON™ – the world’s fastest urethane!**_  
• With a remarkable set of unique and highly-advanced properties, Seismic’s **DEFCON** ultra-high-rebound urethane is the **fastest formula** in the history of skateboard racing, bar none.  
• Credited with virtually every significant world speed and distance record – including the official **Guinness Standup** mark (91.17 mph / 146.73 kph), the official **Guinness Street Luge** mark (101.83 mph / 163.88 kph), the official **Guinness Standup Slide** mark (73.34 mph / 117.35 kph), and the Long-Distance Push **Mile, Marathon, and 24-Hour Ultra** marks!  
• Defcon’s **superior energy efficiency** means not just higher speeds and longer push distances, but also _noticeably longer battery life and rolling range on your e-board!_ (If not yet available, ask your favorite e-board brands to offer pulley adapters fitted to the Turbine hub.)  
• Available in two finely-tuned durometers, both with predictable handling and slow, consistent wear…  
_– 74A Mango:_ Fast, smooth, grippy, and lively underfoot. An optimal balance of properties for most surface conditions.  
_– 76A Mint:_ Ideal for smoother surfaces. Very fast roll with friendlier slide characteristics. Excellent durability.

_**The TURBINE™ core – NEW!**_  
• Integrates nearly 20 years of advanced hub R&D.  
• 53mm tall x 46mm wide – **the largest and most supportive hub ever seen in a wheel this size**_._  
• Formed from 85D fiber-reinforced thermoplastic – the toughest hub material in the industry – with robust bearing lugs.  
• Eight (8) contoured crossbeams (hollowed-out for lightness and aesthetics) combine with deep, wide “saddle” profile to create **robust edge support** and **ironclad 3D mechanical lock** with urethane.  
• Central crossbeams act as internal “turbine blades” that continuously catch and guide Defcon’s superior rolling rebound energy with perfect balance and revolutionary efficiency.  _Boosts both speed and e-board range to another level!_  
• Stiff saddle walls trap and return lateral wheel flex energy to **supercharge rebound** out of pumps, carves, and tight corners.

## Details

- **Price:** 1118.0 HKD
- **Vendor:** Seismic
- **Type:** Wheels
- **Tags:** 74a, 76a, 90mm, LDP wheels, Round&Beveled, Seismic, Ungrounded, Wheels

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| 74a (Mango) | 1118.00 HKD | In stock |
| 76a (Mint) | 1118.00 HKD | In stock |

## Images

- Seismic - 90mm Megawatt
- Seismic - 90mm Megawatt
- Seismic - 90mm Megawatt
- Seismic - 90mm Megawatt

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> Source: [SBDW Longboards Hong Kong](sbdwlongboards.com/products/seismic-90mm-megawatt)
> Updated: 2026-04-20