Measure the rider before comparing bikes.
Start with inseam and overall height. The rider should be able to stand over the bike with comfortable clearance, sit without feeling stretched, and reach the handlebar without locking the elbows.
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1
Check inseam clearance The rider should comfortably stand over the frame with both feet stable.
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2
Test seated reach Hands should rest naturally on the handlebar without shoulder tension.
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3
Confirm braking comfort Brake levers should be easy to reach and squeeze with small hands.