Bike

Bikes or Motorcycles are vehicles used mainly in the Mario Kart series, alongside Karts and ATVs. They come in many different styles and have features that set them apart from normal Karts. They first appeared in Mario Kart Wii and returned in Mario Kart 8. It was removed in Mario Kart 7 due to development constraints.

During the development of Mario Kart: Double Dash!!, Hideki Konno presented the idea of putting bikes in the game. The idea was rejected, because the concept of Mario riding a motorbike was doubtful. However, when Mario Kart Wii came around, they decided to put bikes in and call it Mario Kart X, a name that got changed because Super Smash Bros. Brawl was called Dairantō Smash Brothers X in Japan.

The concept of bikes in the Mario Kart series may have been inspired by the Satellaview game, Excitebike: Bun Bun Mario Battle Stadium.

Mario Kart DS
While bikes do not appear as a class of vehicles in Mario Kart DS, one of Waluigi's special karts, the Zipper, is a tricycle. Also, R.O.B.'s ROB-LGS has three wheels and therefore can also be considered a tricycle.

Mario Kart Wii
Bikes first make an appearance in Mario Kart Wii. The game is the first Mario racing game in which the characters could race in a non-kart vehicle. Peach, Daisy, and Rosalina have alternate biker suits if riding a bike (as it would've been very difficult for them to ride a bike while wearing a dress like when they are driving karts).

The basic model of the bike for all characters is the Standard Bike, a motocross motorcycle showing the emblem of the character over the plate of the front and the sides of the rear. The color of a standard bike also changes, matching the character's custom color. These bikes are the only available to use in Battle modes along with the Standard Karts. These bikes appear to be based on the bikes in Excitebike.

The large bikes are given design differences, depending on which large-sized characters are using them. Except for the Standard Bike L, each large bike has three design differences.
 * The default designs are used by Wario, Waluigi, Donkey Kong, King Boo, Funky Kong, and the large-sized Mii.
 * The second designs, which are depicted having lower positioned exhaust pipes and/or repositioned handles, are used by Bowser and Dry Bowser.
 * The third designs, which are depicted having shorter handles, repositioned foot pedestals, and/or a thinner body, are used by Rosalina.

Additionally, the Bit Bike has a design difference that's only seen when the player is using a small-sized Mii; the Bit Bike's exhaust pipes are positioned lower for the small-sized Miis, than for the other small-sized characters. All bikes differ from karts in many ways. While driving a bike, characters are able to perform wheelies, which boost the player's speed temporarily. If a bike is rammed into while doing a wheelie, the player will lose speed and have to accelerate again. Also, bikes only emit blue sparks when drifting and release a small mini-turbo, thus making bikes unable emit yellow sparks for powerful mini-turbos.

Some bikes, such as the Mach Bike, can perform Inside Drifting, with the bikers riding them leaning toward the inner part of the turn instead of properly drifting, resulting in them drifting in instead of drifting out and, as a consequence, taking sharper and quicker turns.

Mario Kart 8 / Mario Kart 8 Deluxe
After their absence in Mario Kart 7, Bikes return in Mario Kart 8 with the ability to go underwater, use gliders, and utilize anti-gravity. Also, in this installment, just like the karts, bikes are able to perform a Super Mini-Turbo and the bikers only perform wheelies during the boosts obtained via a Mushroom, a boost pad or a rocket start, unlike in Mario Kart Wii. As with karts, the bikes in this game can be customized with different bodies, wheels and gliders. Inside Drifting also returns, though there is a slight delay when compared to Mario Kart Wii. Peach, Daisy, and Rosalina retain their alternate biker suits from Mario Kart Wii. Also, Pink Gold Peach wears a biker suit while riding bikes as well.

Gallery
Names in parenthesis are European variants.