You don't really measure. It depends on age, ability, weight and height. For a beginner rider from age 4 - 20+ I'd look at either the Yamaha pw50 (for a 4-6 yr old), the TTR series of yamahas for older kids, or Honda CRF-F's. A KLX110 by Kawasaki is a great bike for a beginner up to about 11-12
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