Spitfire Wheels F4 99A Lock Ins Formula Four 55mm
by
Spitfire
SKU: SP998
Description
Spitfire Formula Four 99A Lock-Ins Wheels 55mm are Formula Four 99A wheels in the Lock-Ins shape, built for locking into grinds. 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 55mm x 35.9mm, with a 23.5mm riding surface, this size adds a little speed and roll for park and transition. Sold as a set of 4.
Who These Wheels Are For
- Skaters who want locking into grinds
- Park and transition 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
- 55mm diameter, 35.9mm wide, 23.5mm riding surface
- Set of 4
Benefits
- Speed and lasting control on all surfaces
- Locking into grinds
- This size adds a little speed and roll for park and transition
Specs
| Brand | Spitfire |
| Formula | Formula Four |
| Durometer | 99A |
| Shape | Lock-Ins |
| Diameter | 55mm |
| Width | 35.9mm |
| Riding Surface | 23.5mm |
| 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 | 33.9mm | 21.6mm |
| 55mm (this page) | 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 55mm | Formula Four | 101A | 55mm | 35.9mm |
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 55mm are Formula Four 99A wheels in the Lock-Ins shape, built for locking into grinds. 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 55mm x 35.9mm, with a 23.5mm riding surface, this size adds a little speed and roll for park and transition. Sold as a set of 4.
Who These Wheels Are For
- Skaters who want locking into grinds
- Park and transition 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
- 55mm diameter, 35.9mm wide, 23.5mm riding surface
- Set of 4
Benefits
- Speed and lasting control on all surfaces
- Locking into grinds
- This size adds a little speed and roll for park and transition
Specs
| Brand | Spitfire |
| Formula | Formula Four |
| Durometer | 99A |
| Shape | Lock-Ins |
| Diameter | 55mm |
| Width | 35.9mm |
| Riding Surface | 23.5mm |
| 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 | 33.9mm | 21.6mm |
| 55mm (this page) | 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 55mm | Formula Four | 101A | 55mm | 35.9mm |
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.