Bike Sizing

To start racing at club level you do not need a race specific bike – there is plenty of time to plan the race bike of your dreams once you are hooked!

There are some small changes required to turn your normal BMX into a race machine though.

Brakes, you have to run a rear brake. We do not recommend the use of front brakes, but pegs, bike stands, bells and reflectors etc. must be removed.

There are many different bike sizes available and these sizes are generally matched to a rider by their age and height. As all people are created different please use this information as a guide only, although it should get you very close to a suitable bike size.

The different sizing of these bikes refers to the frame size e.g. length of each tube that makes up the frame, the handle bar highest and width, crank length, gearing and the size of the wheels. Each Manufacture has small differences is their specifications but mostly align with the increase in a child’s physical size.

Here are the different bikes sizes listed in order of smallest to largest:

1. Mini wheeler – Traditionally known as balance bikes, they do not have pedals and represent entry into BMX racing for children. Total length of bike must not exceed 88.9cm and total wheel height including inflated tire 33.02cm (ages from 3 up to 5 years old)
2. Micro mini – These bikes have a 18 inch wheel and are the natural progression out of mini wheelers, but before a 20 inch bike. Rider height of 120cm or less (age from 4-5 years old)
3. Mini – Are almost identical to Micro Mini’s but have a 20 inch wheel as all bikes beyond this size do Rider height of 120cm – 140cm (6-8 years old)
4. Junior – These bikes have a noticeable increase in frame size over the mini. Rider height of 140cm -150cm (8-12 years old)
5. Expert – Again frame size has increased noticeably again. Rider height of 145cm -160cm (10 to 15 years old)
6. Expert XL - Rider height of 155cm -170cm, 15+ years old and up from here
7. Pro – Rider height of 165cm -170cm
8. Pro XL - Rider height of 170cm -180cm
9. Pro XXL - Rider height of 175cm and greater
10. Pro XXX - Rider height of 180cm and greater
11. Cruiser – These bikes have a 24/26 inch wheel and generally start at the junior level