United Motocross 21" BMX Bike
United Motocross 21" BMX Bike
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The United Motocross adds a complete setup for taller riders into the United line up, its 21" top tube length is perfect for anyone around and over 6ft.
With a chromoly top tube and 1020 Hi-ten Steel construction throughout the rest of the frame, forks and bars the Motocross is built to take abuse and keep going through the slams and lands. The Motocross features United parts throughout with an ultra loud sealed 14mm cassette hub and 2.3" wide tyres on single walled rims.
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- Free UK Shipping On Orders Over £99.99*
- Complete Tracking On All Orders
- 90 Day Returns Policy
- Free Gifts With All orders
- *Excludes bulky items
NEED SOME HELP CHOOSING A BMX BIKE?
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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) |
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| 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) |
