A bike that doesn't fit will be uncomfortable and can cause injury. Frame size is often listed in centimeters (for road bikes) or standard S/M/L (for mountain and hybrid bikes). Ultimate Beginner Guide to Buying a Bicycle - Yellow Jersey
Choosing the right category narrows down your options immediately. Match your typical terrain to these common bike types: we buy bikes
Built for off-road trails and rugged terrain. They feature flat handlebars, wide "knobby" tires for grip, and suspension to absorb shocks. A bike that doesn't fit will be uncomfortable