Slappy ST1 Inverted Hollow Light Ultra Low Kingpin Polished | 8.75"

Inverted kingpin. Forged baseplate. The gold standard for grind clearance at 8.75".

The Slappy ST1 Inverted Hollow Light Ultra Low Kingpin trucks in Polished at 8.75" are the top of the Slappy range — the configuration that solves the grind clearance problem once and for all. The inverted kingpin flips the conventional design so the threads sit inside the hanger rather than protruding above it, removing the snag point that causes hangups on slappy feebles, back smiths, hurricanes, and any trick that dips the hanger close to the surface. Paired with a hollow axle, hollow kingpin, shorter top bushing, and forged baseplate, the result is a truck that is lighter, stronger, and more grind-friendly than anything a conventional setup can offer. No Hangups Guaranteed — Slappy stands behind it.

At 8.75", this is the size for decks from 8.5" to 8.875" — the versatile mid-range that suits street-focused setups and wider popsicles alike. Same inverted geometry, same forged baseplate, same ~9mm of kingpin clearance and ~20° slappy angle as the rest of the ST1 Inverted Hollow Lights range, with no break-in time and the quickest turn in the line-up. Mike Sinclair built these trucks over two-plus years of pandemic-era garage R&D — selling his car to cover moulds, experimenting with every component from bushing height to hanger geometry — because the industry's grind clearance problem had gone unsolved for too long. The polished silver finish keeps it clean. Sold as a pair.

Key Features

• Inverted kingpin — threads sit inside the hanger, eliminating the #1 cause of grind hangups
• Ultra Low Hollow kingpin and axle — maximum grind clearance with reduced weight
• Shorter top bushing — increases slappy angle for smoother lock-ins on ledges and curbs
• Forged baseplate — compression moulded for superior strength, lighter weight, and no manufacturing defects
• No break-in time — responsive and dialled straight out of the box
• More kingpin thread for fine-tuning truck tightness to your preference
• Sold as a pair

Specs

• Size: 8.75"
• Recommended Deck Width: 8.5" – 8.875"
• Height: 53.9mm
• Kingpin Clearance: ~9mm
• Slappy Angle: ~20°
• Axle/Kingpin: Hollow axle and inverted hollow kingpin
• Baseplate: Forged
• Finish: Polished silver
• Sold as: Pair (2 trucks)

About Slappy Trucks

Slappy Trucks was founded by Mike Sinclair — a veteran team manager who had spent decades behind the scenes at Nike SB, Foundation, and Toy Machine — during the COVID-19 pandemic. Faced with the choice of learning Japanese or building a truck company, Sinclair chose the latter. He spent over two years in his garage experimenting with every component of a skateboard truck — hangers, baseplates, bushings, kingpin heights, turning radii, and grind clearance — and sold his car to cover the cost of production moulds. Launched at the end of 2022, Slappy Trucks set out to make a product-first brand with no corporate backing, no borrowed team, and no compromises. The ST1 Inverted Hollow Lights are the pinnacle of that vision: a truck built from frustration, refined through obsession, and designed to make every grind better.

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Inverted kingpin. No hangups. Slappy everything.