A. The number of gear combinations on a 27-speed bike allows for greater speed adjustments and smoother rides on various terrains. An all-terrain bike, it is designed for off-road use and is equipped with sturdy frames, wider tyres, and suspension systems to manage rough trails and uneven surfaces. The 27-speed bike emphasises gear variety for versatile cycling, whereas the ATB bike prioritises durability and control for off-road excursions.