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Spitfire F4 Lock-Ins 53mm 99a Hjalte Pro Skateboard Wheels

Spitfire F4 Lock-Ins 53mm 99a Hjalte Pro Skateboard Wheels
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Type Street/Park/Vert
Diameter (mm) 53
Duro (a) 99
Contact Patch (mm) 21.5
Lip Profile Round
Surface Smooth
Bearing Core Offset
Colour White

Spitfire F4 Lock Ins 53mm 99a Skateboard Wheels have an asymmetrical  shape to offer you a different control while locking in those grinds. A conical cut on one side with a straight edge cut on the opposite built for precise lock in. These are Hjalte Halberg's Pro wheels.

Tested by Spitfire Team riders, Formula Four Performance Urethane lasted longer, withstood more abuse and performed superior to all other wheels. Spitfire Formula Four Urethane was developed to combine all the desired properties of a performance wheel without sacrificing any one attribute at the expense of another. Formula Four's True lasting Performance Urethane comes not from a single benefit, but from a combination of qualities and features that together produce a truly great wheel Formula Four Performance Urethane is unlike any other.


  • More speed and control on all surfaces
  • Unmatched flatspot resistance
  • Smooth anti-stick slide
  • High rebound compound
  • 100% true performance urethane
  • Holds shape longer
  • 101a durometer
  • Asymmetrically shape designed for Lock-In grinds

Formula Four Wheels retained more material, coned less and kept their original shapes and sizes longer than any other wheel. Formula Four Urethane is made using a 100% pure urethane compound. On the hills, in the streets and parks and in forced flat spot testing in our lab, Formula Four wheels out-performed and resisted flat spots longer with less wear than all other wheels. Formula Four's exclusive combination of High Rebound and Hard Duro produces a faster wheel everywhere. Higher rebound for faster speeds over rough and smooth surfaces. Hard Duro for a harder, faster ride that won't mush out over time. Formula Four's exclusive anti-stick slide gives a fast/consistent, smooth slide all the way through. Slide with confidence start to finish knowing your wheels won't skip or catch mid-slide.

Formula Four gives you the highest level of control and consistent grip you can count on.