Slappy ST1 Inverted Hollow Skateboard Trucks have a hollow axle and an inverted kingpin that locks into a shaft-nut in the baseplate providing reduced weight and durability with ultimate grind clearance. Multiple axle sizes available. Sold as a set of two.
Axle/Kingpin Style
Hollow Axle
Inverted Kingpin
Baseplate Style
Standard
Features
Axle/Kingpin Style
Hollow Axle - Hollow axle trucks cut down on the materials used in the axle, so your trucks feel lighter, because they are lighter.
Inverted Kingpin - An inverted kingpin means the threads are in the trucks, meaning that even after prolonged grinding, you will always be able to tighten or loosen your trucks.
Non-Compatible Risers
Risers from the following brands are not compatible with the baseplates of these trucks.
Bear, Loaded, Paris, Rayne
Specs
Size
8.75 axle
Hanger (mm):
156.0
Board Range (in):
8.5 - 9.0
Height (mm):
53.9
Weight (g):
370.0
Reviews
4.3
Overall Rating
Reviewed by
9
customers
Good with modifications
by JohnnyWasatch
Posted on 2/3/2026
Slappy ST1 Inverted Hollow Skateboard Trucks
Nice light trucks and good for the buck. I had trouble getting these to play friendly with the stock bushings. Lacked support when pushing them hard in transition. Tried slappy hard bushings and they just didn't feel surfy enough. Mini Logo medium bushings of all things brought them to life! Put a little thread loc on the king pin but maybe still have a skate tool handy for when these come loose on you mid session.
Straight out the bag the trucks feel super worn in. It's honestly crazy how they got it dialed in like that. Grind super well and honestly am so happy with my purchase!
0person has found this review helpful
These trucks suck
by Abdul
Posted on 7/24/2023
Slappy ST1 Inverted Hollow Skateboard Trucks
I’ve skated indies for the past 15 years and thought I’d switch it up. The concept of the inverted hollow kingpin and axel is great. Unfortunately these trucks constantly get loose. I hate having to tighten them every day. Stick to the classics yall.
