Slick

The Slick tires are a set of unlockable tires in Mario Kart 7 and Mario Kart 8, and are default in Mario Kart 8 Deluxe.

Mario Kart 7
In Mario Kart 7, the Slick tires offer the strongest speed boost (tied with the Gold Tires), while also offering a small weight boost. Their acceleration and handling are hindered, however; their handling is tied with the Monster, Red Monster, and Gold Tires for being the lowest handling among all the kart parts. They are also tied with the Gold Tires for having the lowest off-road boost in the game.

In terms of hidden stats, the Slick tires excel very poorly while underwater, but they're also one of the very few tires that boost speed, but do not have a negative impact on air handling.

Mario Kart 8 / Mario Kart 8 Deluxe
The Slick tires return in Mario Kart 8 and Mario Kart 8 Deluxe, with their appearance being altered to an extent. Their statistics are also different in that they no longer have a negative impact on handling, and don't boost speed as much as in Mario Kart 7. However, the Slick tires still have one of the worst water speed stats in the game along with the Wood tires, but their water handling has been improved to make up for it. They're also the fastest tires while on any of the anti-gravity portions of a track.

The Slick tires also have a tire counterpart, called the Cyber Slick.

Stat boosts
Stat values are out of 6.

Mario Kart 7

 * Speed: +1
 * Sea Speed: -1
 * Air Speed: 0
 * Acceleration: -0.25
 * Weight: +0.25
 * Handling: -1.25
 * Sea Handling: -1.25
 * Air Handling: 0
 * Off-Road: -2.5
 * Mini-Turbo: 0
 * Stability: 0
 * Drift: +1

Mario Kart 8

 * Ground Speed: +0.5
 * Water Speed: -1
 * Air Speed: +0.5
 * Anti-Gravity Speed: +0.5
 * Acceleration: -0.25
 * Weight: +0.25
 * Ground Handling: 0
 * Water Handling: 0
 * Air Handling: 0
 * Anti-Gravity Handling: 0
 * Traction: -1
 * Mini-Turbo: +0.25