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
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.
Tropix branded long mtb handlebar grips with locking ring
In the past people have had problems with conventional push on grips flying off during extreme riding ( or some times even casual riding) so LOCK ON grips were designed with an alloy band on the end of the grip that can be tightened preventing them sliding off,
These grips are ideal for most types of bike including BMX & Mountain bikes or fixies
Soft grip with plastic insert inner
Standard 22.2mm handlebar size (nearly all bars are 22.2 at the ends)