Age


Height

4-7

Micro-mini

40"-48"

7-9

Mini        

48"-54"

8-11

Junior

50"-57"

10-12

Expert

54"-60"

11-13

Expert XL

56"-64"

13-16

Pro

60"-68"

16&over        

Pro XL

65"-72"

Tall Adults

Pro XXL

72"+

©2012-2014 All content of this web site is property of SPR BMX. All Rights Reserved.
Bike fit and maintenance, while separate, are closely tied together. When purchasing a new bike or making some changes to your current bike you need to have a basic understanding of how the components both are sized for the rider and how they work together. We will start with an overview of the equipment.

BMX race bikes are designed and purpose built to be ridden on BMX dirt tracks. They are very different from road bikes or mountain bikes although they do share some traits. They are light-weight but strong enough to take the jumps and rollers. There are two types of BMX race bikes, class bikes which have a 20" or smaller wheel size and cruiser bikes that have a 24" or larger wheel size. Race bikes are generally single gear with no front or rear suspension.

Below is a table with some common frame sizes based on age/height:
Part 1
Bike Fit Guide and Tips
NOTE:
This chart is provided as a general guideline to sizing a BMX race bike. The information may vary based on rider for all components of a bike. Always check with your local bike shop or service person.
Clear as mud? I know, I know. To make it even a bit more confusing is that the sizes listed in the table vary (sometimes wildly) between manufacturers. So an expert bike from Company A may not be the same size as an Mini from Company B. The key to sizing a bike frame is the top tube length (TT). This is measured from the center of the head tube (the very front of the bike) to the center of the seat tube (where the seat goes). This gives us the best apples to apples comparison for frames.

So how much should I budget for a race bike? At the time of this writing a good entry-level race bike will run you between $300-$400 brand new. You can save quite a bit if you purchase a used bike instead which would probably be somewhere in the area of $150-$400. For smaller kids this can be a good way to get into racing as most micro, mini and junior bikes have probably been very well taken care of and lightly used. You can find some used deals at your local bike shops, national and large regional events or even your local track.

I would strongly caution you about purchasing a used bike from websites like Craigslist or Ebay. While you can find some incredible deals from time to time you really have to know what you are looking for and what you are looking at. If there is any question about an item ask someone who you know and trust. I've seen many new riders wind up with a bike that was in poor condition or had some low quality parts. A wobble in a wheel may be a $20 charge for truing or $150+ charge for a rim and relacing.

We have provided some links to the left of local (Oklahoma City) bike shops and online retailers who carry BMX race bikes to give you somewhere to start looking.

Back to bike fit. There are literally hundreds, if not thousands, of web sites that provide a chart or calculator for sizing bike components. We have one of this site as well on the Tech Page. Most of the time it will be more relevant if you a building a bike or replacing components but they can be helpful.

Now you have a better idea of finding a bike to fit your rider. As always, if you have any questions feel free to ask someone. Now let's move on to some Basic Maintenance.
LOCAL BIKE SHOPS (OKC AREA)
ONLINE RETAILERS
These links are provided for convenience or reference only and are not intended as an endorsement by SPR or their agents.
Continue to Bike Maintenance >>