The progression of sizes in kids bikes goes up in 4" steps, The smallest is 12" followed by 16", 20" and then 24". The 20" range is generally suited to the age range between 5-7, but often last shorter children until they're  closer to the age of 9. 

An exception to this standard sizing comes from the brand BYK, which supplies14" and 18" …

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20 Mongoose Racer X Silver 20 Mongoose Racer X Silver

20 Mongoose Racer X Silver

$299.00 $299.00
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