Kids BMX Frame Size Calculator
Kids BMX Frame Size Calculator
Finding the right size BMX for kids can be tricky because they are not sized the same as normal kid’s bikes. To make life simple for you we have made a kids BMX size frame size calculator.
How to Use The Kids Frame Size Calculator
1) Enter the kid’s height in the kid’s bike size calculator.
2) Measure the child’s leg length/inseam. (measure from the ground to the top of the inside of their leg)
3) If the leg length/inseam is within the recommended range then this is the correct frame size.
If their leg length is:
⬆ More than the recommended range consider going up a frame size
⬇less than the recommended range consider going down a frame size
Kids BMX Size Calculator (Plus Size Guides & Charts)
Race BMX Sizing Chart
| Rider Height | Frame Size | Toptube Length | Stem Length | Bar Rise | Bar Width | Crank Length | Gearing |
|---|---|---|---|---|---|---|---|
| 4’4″ & under | Micro | 15″ – 16.5″ | Mini: 25mm – 35mm | 2″ – 2.5″ | 20″ – 22.5″ | 145 – 155mm | 41-43 / 16 |
| 4’2″ – 4’10” | Mini | 16″ – 17.5″ | Mini-Mini XL: 30mm – 40mm | 2″ – 3.5″ | 21″ – 23.5″ | 155 – 165mm | 41-43 / 16 |
| 4’6″ – 5’1″ | Junior | 17″ – 18.5″ | Mini XL-Expert: 40mm – 45mm | 3″ – 5″ | 22″ – 25″ | 160 – 175mm | 42-43 / 16 |
| 5’0″ – 5’4″ | Expert | 18.5″ – 19.5″ | Expert-Pro: 43mm – 48mm | 5″ – 7″ | 25.5″ – 27″ | 170 – 175mm | 42-43 / 16 |
| 5’2″ – 5’6″ | Expert XL | 19.5″ – 20″ | Expert-Pro: 43mm – 48mm | 6″ – 7″ | 25.5″ – 27″ | 170 – 175mm | 42-43 / 16 |
| 5’3″ – 5’8″ | Pro | 20″ – 20.5″ | Pro: 50mm – 55mm | 7″ – 8″ | 27″ – 28″ | 175 – 180mm | 43-44 / 16 |
| 5’7″ – 6″ | Pro XL | 20.5″ – 21.25″ | Pro XL: 50mm – 55mm | 8″ + | 28″ | 180 – 190mm | 44 / 16 & over |
| 6″ & over | Pro XXL | 21.25″ – 22″ | Pro XXL: 52mm – 60mm | 8″ + | 28″ | 180 – 190mm | 44 / 16 & over |
How Do You Size a Race BMX?
The best way to size a race BMX is to look at a size chart that uses your height and inseam to determine your ideal size range.
What Age Should You Start BMX?
Children can start BMX as young as 3 years old if they have the right bike and are conformable at riding. All kids are different, so it mainly comes down to their height and ability. in recent years pump tracks have become popular with all ages, and they are also a great way for your child to learn the basics of BMX. Our little one started riding the local pump track on his balance bike and then made a seamless transition onto pedals.
How High Should a Kid’s BMX Seat Be?
BMX saddle height depends on personal preference. Most people don’t sit down and pedal while riding BMX, so the seat does not need to be up too high. Many BMX riders prefer their saddles as low as possible (out of the way), and others like them to be a few inches up, which can help the rider know where the bike is in relation to their legs.
Does Frame Size Matter BMX?
In short yes, correct BMX frame size is very important. No matter if you are a child or an adult we all come in a wide range of sizes. BMX brands offer a good range of frame sizes for kids. However, when it comes to larger adults there are fewer options available.
Should I Size up When Buying a Kid’s BMX?
Only size up if your child is closely between two sizes. Otherwise, try and stick to the recommended size because if the bike is too big it will often be hard work for your little ones to handle. At the end of the day getting the correct size bike is important because it will allow them to gain confidence and more importantly have fun!
Can Girls Ride BMX?
Of course, girls can ride BMX! There are also many professional female BMX riders. Riding BMX is a sport that’s open to all no matter your age, gender or ethnicity.
How Much Does It Cost to Start Bmx?
Starting BMX riding can start from as little as $200 for a used BMX, and can go up to $2000+ for a high-speed new BMX. Many people new to BMX normally want to know if it’s worth spending money on a high-end well spec’d BMX. The simple answer is yes, but within reason. Most riders won’t have the need to get the highest spec’d BMX possible, but if you buy a cheap BMX you will most likely not enjoy it as cheap BMXs are usually heavy and no fun ride. So at a minimum, go for a BMX from a known BMX brand that has 3-piece cranks.
Final Thoughts on Kid’s BMX Size
When looking for the correct size kid’s BMX you can either try our kid’s bike size calculator at the top of this page, or you can check out the kid’s BMX frame size chart alow on this page. Remember, try and stick to the recommended frame size, sizing up can be tempting but you’re only going to make like hard for your little one.
You may also like:
- If you are looking for normal kids bike size calculator you can check out our: Kids Bike Size Calculator (Plus Size Guides & Charts)
- If you are looking for a mountain bike frame size calculator, check out our Mountain Bike Frame Size Calculator, Charts, Fit & Frame Geometry
- If you’re looking for a saddle height calculator: Bike Saddle Height Calculator
