Spitfire Wheels Formula Four Lock In White (57mm/99d)

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Spitfire Wheels Formula Four Lock In White (57mm/99d)

The classic natural-white urethane gets a clean hit of black and electric blue—SPITFIRE in old-English type ringing the hub with “LOCK-INS.” This 57mm setup rides tall for speed and smoother roll through rough LA sidewalks, while the asymmetrical Lock-In shape puts a conical cut on the outside and a straight “lock” edge on the inside so ledges and rails feel like they’ve got a groove just for you.

Under the hood is Formula Four 99DU urethane—fast, durable and famously resistant to flat spots, built for long slide control without that chattery feel. Expect more speed with less wear and a balanced grip/slide on real-world terrain from parks to gritty street spots.

If you like numbers, the 57mm Lock-In Full variant measures about 40.2mm wide with a 27.5mm riding surface for extra stability; standard Lock-Ins are slightly narrower but share the same asym profile and purpose-built locking edge.

Born under San Francisco’s Deluxe Distribution (DLXSF) umbrella—home to Real, Antihero, Thunder, and Krooked—Spitfire has kept its focus tight since the ’90s: premium urethane, skater-run direction, and graphics that are part of skateboarding’s visual language.

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.