The engine can be throttled down for the very young and new riders.
Dirt bike sizes.
For both the 5 to 9 and 7 to 10 age groups it really depends on what bike has the more appropriate stand over height seat height.
Between 8 and 11 years old kids will be able to use a standard gear box so a 65 cc mini dirt bike will be the best choice.
Kids 5 to 9 years old.
These bikes have all of the same controls as a full sized adult dirt bike.
Generally speaking the cc s affect the power and smoothness of your ride but are not necessarily a measurement of power.
This is a dirt bike sizing chart guide please keep in mind that a pit bike is a dirt bike with smaller tires usually 10 or 12.
A 50cc bike is an ideal size for kids aged between 3 7.
Typically 21 to 28 seat height 50cc 110cc dirt bikes.
As the rider improves the throttle can be adjusted to increase performance.
Typically 17 to 21 seat height 50cc 70cc 80cc 90cc dirt bikes.
My article on finding the best trail bike might also be useful in your dirt biking quest.