Grind confidently with the Spitfire Formula Four Lock-Ins Skateboard Wheels. The Spitfire Lock-In shape features a familiar conical cut profile with a straight edge on the other side in order to lock into grinds for reduced slipping. Poured with Formula Four Urethane in a medium profile with a smooth surface. Sold as a set of four in multiple sizes and durometers.
Surface
Smooth
Quantity
Set of 4 Wheels
Wheel Profile
Medium
Key Features
Formula Four Urethane
Wheel Shape
Lock Ins Cut
Durometer
99a
Features
Surface
Smooth - Smooth wheels come with a shiny coating on the riding surface that feels grippy at first, but wears away quickly.
Wheel Profile
Medium - Your classic wheel shape, versatile all-around wheel for street/park skating.
Key Features
Formula Four Urethane - Unmatched abrasion resistance for fewer flat spots. More controllable grip. Lasting speed no matter the terrain. Smooth anti-slick slide and a longer lasting size and shape.
Wheel Shape
Lock Ins Cut - Asymmetrically cut, you can get the benefits of conical outer walls while the inside wall is cut straight, giving you a flat surface to lock in your grinds.
Durometer
99a - Offers more grip than harder wheels and more slide than softer wheels. Great for slick surfaces when you want more control.
Specs
Size
53mm
55mm
Diameter (mm):
53.0
55.0
Width (mm):
33.9
35.9
Riding Surface (mm):
21.6
23.5
Suggested Riser Size (in):
N/A
1/8
Reviews
4.8
Overall Rating
Reviewed by
23
customers
Meh
by Gary Louderback
in EUGENE, OR(Verified Buyer)
Posted on 11/18/2023
Spitfire Formula Four Lock-Ins Skateboard Wheels - natural (99d)
57 was too big for me, still sick wheels
0person has found this review helpful
Not my favorite
by Shane Smith
in Pagosa Springs, CO(Verified Buyer)
Posted on 11/9/2023
Spitfire Formula Four Lock-Ins Skateboard Wheels - natural (99d)
If you’re used to skating wheels such as the spitfire classic, Bones Street Formula or anything narrow. This conical shaped wheel may not be for you. I bought this wheel because I’m big on grinding and box tricks and the “lock-in” name definitely lured me in but I absolutely hatred these wheels. Way too much surface area for technical flip tricks, they didn’t lock in and better than a narrow cut wheel and overall I was just pretty dissatisfied with them. I think for a beginner they would be fine, as you don’t have enough experience just yet to really notice those minor differences but for a seasoned skateboarder; you’ll notice and you might be disappointed. They held up fine for the short time I skated them though. They’re a quality made product but just not for my style of skating. If you’re unsure, just go with the spitfire classic.
0person has found this review helpful
Lock ins 57mm(99d)
by Billy Perkins
in Sapulpa, OK(Verified Buyer)
Posted on 9/12/2023
Spitfire Formula Four Lock-Ins Skateboard Wheels - natural (99d)
I feel like these are helping me lock in on grinds much better so there not just a gimmick so i would recommend if you like to get better or learn new truck grinds they help out a lot!
0person has found this review helpful
Good Stuff, Very Spicy!
by Glance Dodger
in Berkeley, CA(Verified Buyer)
Posted on 5/26/2020
Spitfire Formula Four Lock-Ins Skateboard Wheels - natural (101d)
Lock-in is no lie. These puppies work. Click, bam, boom... locked. Super smooth. I recommend getting 1 mm size larger than you would normally ride, let the edges round out a little.
3people have found this review helpful
controlled slides, fast and smooth
by Chad Chaves
in south el monte, CA(Verified Buyer)
Posted on 5/22/2020
Spitfire Formula Four Lock-Ins Skateboard Wheels - natural (99d)
Nice shape, looks cool with graphic out,im stoked on the way the ride. Get some!!!
0person has found this review helpful
Lock-ins
by Nicholas Buono
in Castleton On Hudson, NY(Verified Buyer)
Posted on 4/20/2020
Spitfire Formula Four Lock-Ins Skateboard Wheels - natural (101d)
