Spitfire Wheels F4 99A Lock Ins Formula Four 53mm
by
Spitfire
SKU: SP983
Description
Spitfire Formula Four 99A Lock-Ins Wheels 53mm put Formula Four 99A urethane into the Lock-Ins shape, an asymmetrical shape with a conical cut profile on one side and a straight-edge lock-in cut on the other. Formula Four 99A is made for speed and lasting control on all surfaces, and it's one of Spitfire's most ridden duros worldwide.
At 53mm x 33.9mm, with a 21.6mm riding surface, this mid size is the go-to for street and park. Sold as a set of 4.
Who These Wheels Are For
- Skaters who want locking into grinds
- Street and park skaters
- Skaters who want Spitfire's most ridden duro
- Spitfire fans
Features
- Formula Four 99A urethane
- Formula Four urethane: unmatched flatspot resistance and smooth anti-stick slide, per Spitfire
- Lock-Ins shape
- 53mm diameter, 33.9mm wide, 21.6mm riding surface
- Set of 4
Benefits
- Speed and lasting control on all surfaces
- Locking into grinds
- This mid size is the go-to for street and park
Specs
| Brand | Spitfire |
| Formula | Formula Four |
| Durometer | 99A |
| Shape | Lock-Ins |
| Diameter | 53mm |
| Width | 33.9mm |
| Riding Surface | 21.6mm |
| Includes | Set of 4 wheels |
Compare Formula Four 99A Lock-Ins Sizes
Every size in this line uses the same formula and shape.
| Size | Width | Riding Surface |
|---|---|---|
| 52mm | 33.3mm | 20mm |
| 53mm (this page) | 33.9mm | 21.6mm |
| 55mm | 35.9mm | 23.5mm |
| 57mm | 37.4mm | 24.7mm |
Lock-Ins in Other Durometers
The same Lock-Ins shape in a different formula or durometer, in this size or the closest one available.
| Wheel | Formula | Durometer | Size | Width |
|---|---|---|---|---|
| Formula Four 101A Lock-Ins Wheels 53mm | Formula Four | 101A | 53mm | 33.9mm |
Complete Your Setup
New wheels deserve fresh bearings. Spitfire makes three tiers:
- Spitfire Cheapshots Bearings (Good): Spitfire's base-level bearing, tested by the pro team, with removable black shields to keep the crud out.
- Spitfire Classics Bearings (Better): Superfast and durable, with heat-resistant chromium steel rings, removable nylon cages, and blue removable shields.
- Spitfire Burners Bearings (Best): Spitfire's high-performance pick, with polished honed races and high carbon chromium steel, packed in a reusable tin.
FAQ
Is 99A hard or soft?
Hard. 99A is the standard street and park hardness: fast, with a controllable slide.
What is the Lock-Ins shape good for?
Locking into grinds. Spitfire describes it as an asymmetrical shape with a conical cut profile on one side and a straight-edge lock-in cut on the other.
What size wheels should I get?
Smaller wheels (50 to 52mm) are light and technical, 53 to 54mm is the street and park go-to, and 55mm and up adds speed for transition and rough ground. See our skateboard wheels guide for more.
Description
Spitfire Formula Four 99A Lock-Ins Wheels 53mm put Formula Four 99A urethane into the Lock-Ins shape, an asymmetrical shape with a conical cut profile on one side and a straight-edge lock-in cut on the other. Formula Four 99A is made for speed and lasting control on all surfaces, and it's one of Spitfire's most ridden duros worldwide.
At 53mm x 33.9mm, with a 21.6mm riding surface, this mid size is the go-to for street and park. Sold as a set of 4.
Who These Wheels Are For
- Skaters who want locking into grinds
- Street and park skaters
- Skaters who want Spitfire's most ridden duro
- Spitfire fans
Features
- Formula Four 99A urethane
- Formula Four urethane: unmatched flatspot resistance and smooth anti-stick slide, per Spitfire
- Lock-Ins shape
- 53mm diameter, 33.9mm wide, 21.6mm riding surface
- Set of 4
Benefits
- Speed and lasting control on all surfaces
- Locking into grinds
- This mid size is the go-to for street and park
Specs
| Brand | Spitfire |
| Formula | Formula Four |
| Durometer | 99A |
| Shape | Lock-Ins |
| Diameter | 53mm |
| Width | 33.9mm |
| Riding Surface | 21.6mm |
| Includes | Set of 4 wheels |
Compare Formula Four 99A Lock-Ins Sizes
Every size in this line uses the same formula and shape.
| Size | Width | Riding Surface |
|---|---|---|
| 52mm | 33.3mm | 20mm |
| 53mm (this page) | 33.9mm | 21.6mm |
| 55mm | 35.9mm | 23.5mm |
| 57mm | 37.4mm | 24.7mm |
Lock-Ins in Other Durometers
The same Lock-Ins shape in a different formula or durometer, in this size or the closest one available.
| Wheel | Formula | Durometer | Size | Width |
|---|---|---|---|---|
| Formula Four 101A Lock-Ins Wheels 53mm | Formula Four | 101A | 53mm | 33.9mm |
Complete Your Setup
New wheels deserve fresh bearings. Spitfire makes three tiers:
- Spitfire Cheapshots Bearings (Good): Spitfire's base-level bearing, tested by the pro team, with removable black shields to keep the crud out.
- Spitfire Classics Bearings (Better): Superfast and durable, with heat-resistant chromium steel rings, removable nylon cages, and blue removable shields.
- Spitfire Burners Bearings (Best): Spitfire's high-performance pick, with polished honed races and high carbon chromium steel, packed in a reusable tin.
FAQ
Is 99A hard or soft?
Hard. 99A is the standard street and park hardness: fast, with a controllable slide.
What is the Lock-Ins shape good for?
Locking into grinds. Spitfire describes it as an asymmetrical shape with a conical cut profile on one side and a straight-edge lock-in cut on the other.
What size wheels should I get?
Smaller wheels (50 to 52mm) are light and technical, 53 to 54mm is the street and park go-to, and 55mm and up adds speed for transition and rough ground. See our skateboard wheels guide for more.