Chances are really quite good that a lady who has neither the time, inclination nor money to buy 5 custom-fitted high quality bikes for her kids in a hurry would just end up buying used Walmart bikes from CL, and might not even know it. At least this way, she knows where to return it.

Bikes are pretty much all ill-fitting at those ages. Even if you take the trouble to size it properly, it'll likely be the wrong size within a month. Growth spurts are really sudden and pretty dramatic.

Get back to us when you have to budget your time and money caring for 5 kids and have to buy items you aren't knowledgeable about.