Children's bikes are generally measured by wheel size, rather than by frame size. Remember children do grow very quickly and you need to take this into consideration when buying a kids bike, However, if you buy a bike that is simply too big for your child, you will compromise your child's safety, and ultimately discourage your child from cycling.
Age of Child
Wheel Size
3 Years
12"
4 Years
14"
5 Years
16"
6 Years
18"
7/8 Years
20"
8/10 Years
24"
Which Size Bike Do I Require?
Adults bikes and those for 10/11 years and over, are generally measured by frame size. This is normally the measurement between the centre of the bottom bracket to the top of the seat tube.
Riders Height In Feet & Inches
Mainly Off Road Use Frame Size Required
Mainly On Road Use Frame Size Required
Road Racing Bikes Frame Size Required
4 feet 8 to 5 feet 0
12 to 14 inches
13 to 15 inches
46 to 48cm
5 feet 0 to 5 feet 4
14 to 16 inches
15 to 17 inches
48 to 50cm
5 feet 4 to 5 feet 8
16 to 18 inches
17 to 19 inches
50 to 52cm
5 feet 8 to 6 feet 0
18 to 20 inches
19 to 21 inches
52 to 56cm
6 feet 0 to 6 feet 2
20 to 22 inches
21 to 23 inches
56 to 60cm +
Silicone casing in Alien Head design features stretch band mount to wrap around handlebars, seatpost, frame - wherever it suits best! No mounting brackets, no tools, and being pocket sized, so easy to remove and carry with you to prevent theft, or switch over to another bike if you need to!