We did that too when they were younger. They each had a 24” trek, or Jamis. The return diminishes when they get a bit older. Consider how long a new bike is going to fit say, and 11 year old. They start at 35lbs and 40” tall and by the time they’re 13 they’re 100 lbs and 5 ‘ tall. It’s just easier to size up to a 26 ASAP unless they’re already racing because hey basically ride up and down the street. My kids all started riding more seriously around the 13 year time frame.
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