Fat Bike Definition

noun

A bicycle specialized for riding on snow-covered trails, such as snowshoeing trails, cross-country skiing trails, winter hiking trails, and skiing pistes. The bikes have fat wide snow tires, similar to aviation tundra tires and trucking M/S tires, to increase traction on ice and snow.

Wiktionary

Other Word Forms of Fat Bike

Noun

Singular:

fat bike

Plural:

fat bikes

Origin of Fat Bike

fat +‎ bike FAT BIKE , from the fat tires (tyres) equipped to these bicycles and their requisite need for wider frames to accommodate the width of the tires.

From Wiktionary