Product Description
The Step Up 18" is built for kids who are ready for bigger challenges but not quite ready for 20-inch wheels.
Designed with a lightweight aluminum frame and responsive geometry, it provides easy handling and control for growing riders. With sturdy components and smooth-rolling tires, it’s made to handle everything from cruising to learning new tricks.
The Step Up 18" strikes the perfect balance of fun and function, offering the durability and performance your young rider needs to confidently push their limits.
NEED SOME HELP CHOOSING A BMX BIKE?
We have compiled a complete BMX buyers guide to help you through the process! Keep reading to find out more about your perfect BMX bike. Here at SourceBMX we are all riders, so we can offer advice that only 100% rider-owned BMX shops can - just ask.
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BMX BIKE SIZE GUIDE
BMX bikes are measured in two ways: the size of the wheel (20” is the standard BMX wheel size), and the length of the frame which is gauged by the top tube measurement. We have also simplified for you into XS, Small, Medium, etc.Here is a guide to what size you should be looking for - note that there is some overlap in sizes, as personal preference also comes into the equation!
| Rider Height (in) | Rider Height (cm ) | Wheel Size (in) | Top Tube Length (in) |
|---|---|---|---|
| 2FT - 3FT | 60 - 90cm | 12" | 11.5" - 13" |
| 2'8" - 3'4" | 80 - 100 cm | 14" | 2.8" - 15" |
| 3FT - 3'8" | 90 - 110cm | 16" | 14.5" - 17" |
| 3'6" - 4'6" | 105 - 135cm | 18" | 17" - 18.5" |
| 4'6" - 5'1" (XS) |
135 - 155cm | 20" | 18" - 20" |
| 4'10" - 5'4" | 147 - 162cm | 20" | 20" - 20.25" (XS - S) |
| 5'2"- 5'8" | 157 - 173cm | 20" | 20" - 20.5" (S - M) |
| 5'6" - 6FT | 165 - 185cm | 20" | 20.25" - 21" (M - L) |
| 6FT + | 180cm + | 20" | 20.75" + (L - XL) |


