Spitfire Wheels Formula Four Lock In White (55mm/101d)
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The Spitfire Wheels Formula Four Lock-Ins White (55mm/101d) are built for skaters who want a locked-in feel on grinds without sacrificing performance on transitions, flatground, or rougher terrain. Featuring Spitfire’s Formula Four urethane, these wheels are engineered for unmatched flatspot resistance, durability, and control at high speeds, while maintaining grip when you need it and a consistent slide when you don’t.
The Lock-In shape is an asymmetrical profile that features a conical cut on the inside edge and a straight edge on the outside. This design helps you “lock in” to ledges and rails while still feeling fluid and predictable on all-terrain. With a riding surface of 22.6mm, these wheels deliver extra control under your feet and hold firm during long grinds and slides.
Sized at 55mm in diameter and 33.5mm wide, they hit the sweet spot for street skaters who want a little more meat under their setup or park skaters who demand more control. The 101a durometer makes them hard enough for smooth parks and tech street skating while still feeling reliable under power slides and speed checks.
Decorated with the classic red-on-black swirl graphic and gothic “LOCK-INS” lettering, they’re not just tough—they look raw and ready to rip. The SKU for this item is 2111011555, a staple for skaters who push through crusty spots and still demand a crisp response every session.
Spitfire, founded in 1987 under the Deluxe Distribution umbrella, has been at the heart of skateboarding’s core wheel culture since day one. From Daewon Song to Ishod Wair, their roster has always featured riders who embody tech finesse and power skating. Their Formula Four urethane is widely considered one of the best formulas on the market, with innovation that continues to set the bar in skateboarding wheel tech.
Looking to add a set of wheels that’ll lock in and stay true through every grind, slide, and carve? These Lock-Ins have your back.
Stix SGV has proudly served the San Gabriel Valley skateboarding community since the late ‘90s. With three locations across Los Angeles County, we’ve been deeply rooted in the local scene. Our Monrovia shop has been a staple since 1997, followed by our Claremont location in 2014, and our South Pasadena shop opening its doors in 2022. Our mission has always been simple: to uphold skateboarding culture and stay true to our community.