ATB, or "All Terrain Bike" is a type of bike that can ride on a variety of terrains, from city streets to mountain trails. For those who are looking for synonyms for this versatile bike, "mountain bike" or "off-road bike" might be suitable options. Other possible synonyms include "gravel bike", "dirt bike" or "adventure bike", as they all suggest a bike that is capable of handling different types of surfaces with ease. Additionally, "hybrid bike" or "crossover bike" could also be used to describe an ATB, as it combines features of both road and mountain bikes.