Spitfire
55mm Formula Four Lock Ins (99 Duro)
$45
Visit storeDripsy review · 8.1/10
Spitfire Formula Four Lock Ins Review: 40 Months of Quiet Demand
Dripsy Editorial · 1 editorial review
Spitfire built its name in skate hardware, and the Formula Four Lock Ins bring that subcultural credibility to the swim trunk category. At $45, the price sits mid-shelf for unisex cuts. The real tell is longevity: this piece has been continuously stocked since March 2023 across two independent shops, including Uprise Skateshop — forty months of quiet, repeat-order demand that trend-driven drops rarely survive.
Good: 40 months of unbroken shelf presence · Competitive $45 price for the category · Skate-rooted brand with genuine subcultural cred
Trade-offs: Only two boutiques currently stock it · Niche skate branding limits broad appeal
For the skate-adjacent buyer who wants swim gear with subcultural identity, not mall-brand anonymity — skip if you need wide availability.
Read the full reviewDetails
Spitfire
@spitfirewheels
Sold by Uprise Skateshop
also at Uprise
Ships from Wicker Park, Chicago · Est. $55 shipped
Available sizes
Price history
Best price across 2 storesDripsy review
8.1/10
Spitfire built its name in skate hardware, and the Formula Four Lock Ins bring that subcultural credibility to the swim trunk category. At $45, the price sits mid-shelf for unisex cuts. The real tell is longevity: this piece has been continuously stocked since March 2023 across two independent shops, including Uprise Skateshop — forty months of quiet, repeat-order demand that trend-driven drops rarely survive.
Good: 40 months of unbroken shelf presence · Competitive $45 price for the category · Skate-rooted brand with genuine subcultural cred
Trade-offs: Only two boutiques currently stock it · Niche skate branding limits broad appeal
About this piece
The Spitfire Formula Four Lock Ins are a set of four skateboard wheels designed for performance. These wheels are a popular choice for skaters seeking a reliable and durable option. - Set of 4 skateboard wheels - Formula Four Lock Ins model - 55mm diameter - 99a durometer (99 Duro)
About Spitfire
Spitfire was founded in San Francisco in 1987 by Jim Thiebaud as part of the Deluxe Distribution family alongside Real, Anti-Hero, and Venture. The brand's Bighead logo (1992) and Formula Four urethane wheels (2013) cemented its status as skateboarding's dominant wheel manufacturer.