I HAVE 2 YEAR OLD AND WE GOT HER THE 18 INCH FMF (ITS SMALL!!) WELL THE CRANKS WERE HUGE 140s. I know redline has 130s the smallest available but that was still to big I took the cranks to r-way tooling in vineland and had them cutt down and re polished to 120s (perfect ) I paid she can pedal it! straight we have to work on turning! , this may take a while. lol It cost us about 90 bucks not bad! Are son started at 3 and has strugglled to get a good spin going on 135s I wish we did this for him. o-well he has the winter to grow.