Adults from 4’10” to 6’4” would find a full size 20-inch BMX bike most suitable for them.
It is, however, very important that you know how BMX bikes are measured. From that, you can pick the most fitting size for your body type and riding style.
Freestyle BMX bikes are usually measured by the top tube length. Other styles are measured by the wheel size.
In this post, we will walk you through all the necessary considerations to choose the best BMX bikes for adults. Read on to find the answer for your need.
How BMX Bikes Are Measured
There are 2 ways in which BMX bikes are measured. Firstly, by the wheel size.
Basically, they measure the diameter of the wheel.
The 20-inch BMX bike is the full size bike which you will hear many people talk about.
On the market today, you will often see wheel sizes from 20, 24, 26, or even up to 29 inches.
The second way BMX bikes are measured is by the top tube length.
Top tube varies in length. It can go from 15 inches to 22 inches.
The shorter ones are for kids or teenagers. The longer ones are for adults.
You will usually find freestyle BMX bikes measured by the top tube length because it helps riders find the perfect balance point when doing tricks.
BMX Bikes Size By The Wheel Size
If you are a bit shorter than 5’, then a full size 20-inch BMX bike would fit you well.
If you are taller, consider buying the 24-inch one. That wheel size will give you enough height from the ground and support your body weight nicely.
However, if you are a heavy rider and quite tall, check out the 29-inch or 29er one. Those wheels will support your overall weight reliably in many different situations.
Check out the table below for a quick summary of our recommended size.
Recommended BMX Size (Wheel)
|4’4” - 5’0”||20|
|6’0” & up||29|
Freestyle BMX Bikes Size By The Top Tube Length
This size chart would be more applicable if you are shopping for a freestyle BMX bike.
Very simply, the top tube length is the length measured from the center of the seat tube to the center of the head tube.
Freestyle BMX bikes are measured this way because it allows users to easily choose the length that provides them with the most balanced point when doing tricks like spinning.
The most common size for adults is from 18 to 22 inches. If you are less than 5’2”, then an 18 or 19 BMX bike would fit your needs well.
If you are from 5’3” to 5’5”, then the top tube length of 20 inches would be perfect.
If you are taller than that, check out those with 21 or 22 inch top tube. They will let you perform your tricks more easily.
See the table below for our recommended freestyle BMX bike sizes:
|Rider Height||Recommended BMX Size (Top Tube)|
|4’9” - 4’11”||18|
|5’ - 5’2”||19|
|5’3” - 5’5”||20|
|5’6” - 5’9”||21|
|5’10” - 6’0||22|
Pro BMX Bike Size
At this point, many people often ask what BMX bike size do the pros ride. This is because they want to get a ballpark number that may work out well for them.
The real answer is it really depends on your style and personal taste. But as a general range, you will find many pro riders choose bike size from 20.5 to 21 inches.
And we are talking about the top tube length here.
For example, because Dennis Enarson is quite tall, he rides a 21-inch bike.
Chad Kerley, however, is slightly shorter so he rides a 20.8-inch more comfortably.
You should note that the rider height alone doesn’t necessarily decide the size of bike you will ride. There are many shorter pro riders that ride bikes with longer top tubes.
It is a matter of how you get used to your gear and practice your moves masterfully on it.
Once you’re comfortable, you will find the bike easy to control–no matter how tall or short it is.
BMX Bike Geometry and Measurements
If you are a visual learner, try watching this short video to help you understand more of how a BMX bike is built and its measurements.
Other Tips When Choosing a BMX Bike Size
If you are unsure of what size to get, be sure to pay a visit to a nearby bike shop to try out one of their BMX bikes.
If you are shopping online, check what size the seller is referring to. Is it the wheel size or the top tube length?
The other thing you should keep in mind is the stem size. If you are a taller rider, choose the stem with a higher rise so you don’t need to hunch over too much.
If you are a shorter rider, choose the stem with a lower rise so you can ride more comfortably.
For barspin tricks, be sure to choose a stem with a shorter reach. This is because it allows you do perform the tricks easily.
If you are using your BMX bikes for trails, a longer reach is good because your body won’t get too tired along the road.
How To Buy A BMX Bike
This video should help you answer the question with great details. Be sure to check it out below:
As you can see, choosing the perfect BMX bike size for you is not difficult at all. You just need to remember the way the bike is measured. That is, by the wheel size and by the top tube length.
Also, take into account your personal riding style, the stem reach and rise, and you’re very much good to go. After reading, hopefully you have a clearer idea of which bike size you are going to get. Thanks for reading & enjoy your ride!