

Product Description
The United Rooftop sits at the top end of United's line up, ready to take on the streets and park with its Chrome finish topping the build off.
With a chromoly top tube and 1020 Hi-ten Steel construction throughout the rest of the frame, forks and bars the Rooftop is built to take abuse and keep going through the slams and lands. The Rooftop features United parts throughout with a sealed 14mm cassette hub, sealed front hub and 2.3" wide tyres on single walled rims.
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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) |