# FAQ: What Does Bike Frame Size Mean?

## How is frame size measured on a bike?

Adult bikes are measured by their frame size. Most manufacturers now measure the frame from the centre of the crank axle, to the top of the seat tube. Most road bikes are measured in centimetres (cm), whereas mountain bikes are generally measured using inches (in).

## What is bike frame size?

The frame size is simply the length of the bike’s seat tube, measured from the center of the cranks to either the top of the tube (referred to as “center to top”), or to the point where the seat tube intersects with the top tube (referred to as “center to center”).

## What does the bike size represent?

Bike frames are commonly measured in centimetres or inches representing the length of the seat tube. For example, a manufacturer may measure the seat tube length of a bike as 51cm, and then describe it is a small frame.

## What does an 18 inch bike frame mean?

A bicycle size chart uses that inseam measurement to determine which size of that particular model is right for you. In very general terms, an 18-inch bicycle is best for someone just under six feet in height, but factors like inseam length and the differences between bike manufacturers can all influence the fit.

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## How do you determine your frame size?

Approximate your frame size by wrapping your fingers around your wrist. If your thumb and index finger overlap, you likely have a small frame. If the two meet, your frame size is probably medium and you are large boned if they do not meet.

## What does a 26 inch bike mean?

And what does it mean when they say “26 inch”? A 26 inch mountain bike means that the wheels have an internal diameter of 26 inches. For example, a man who stands 5’8″ would be best suited for a 20-inch frame with 700c wheels or larger (700c refers to the diameter of the wheel).

## What does body frame size mean?

Body frame size is determined by a person’s wrist circumference in relation to his height. For example, a man whose height is over 5′ 5″ and wrist is 6″ would fall into the small-boned category.

## Is 20 inch bike for adults?

In the world of bicycles, there is nothing quite like a 20 inch bike. Smaller bikes fit neatly into the category of children’s cycles, while larger two-wheelers are designed for older children, teenagers, and adults. To further complicate things, there are plenty of 20-inch offerings for teenagers and adults.

## What does a 20 inch bike mean?

What is a 20” bike? The ’20 inch’ refers to the size of the wheels. Traditionally it is a common size and follows on from 14” and 16”, and then comes before 24”, 26” and beyond. It is also the wheel size of choice for the vast majority of BMX bikes.