From the Super Mario Wiki, the Mario encyclopedia
The Brown Offroader is a kart in Mario Kart Tour. Like the name suggests, it is a brown-colored variant of the Offroader and is classified as a tour-exclusive High-End kart. As a result, it appears to be a brighter version of Donkey Kong's Offroader from Mario Kart Wii, but with a red flag and brown shock absorbers. Unlike the Offroader, it uses a set of tires that match the one seen on the back of the vehicle, which also resemble the Koopa King's tires. Also unlike the Offroader, this kart increases the speed boosts and points resulted from driving over Dash Panels.