TRUCKS: What is the difference between a normal and an inverted kingpin or downlow kingpin?

Inverted kingpin gives you more grind clearance. The newly designed and first ever Independent inverted kingpin can be used with either a 5.5mm Allen key or standard 9/16" hex wrench. The innovative new Shaft Nut in the baseplate creates a rigid and durable solution to lateral movement found in most inverted kingpin designs and increases adjustability.