Baby bike tire size: 12 inc to 20 inch. 12*1.75", 12*2.125", 14*1.75, 14*2.125,16*1.75,16*2.125, 20*2.125.

Baby bike tiresize: 12 inc to 20 inch. 12*1.75", 12*2.125", 14*1.75, 14*2.125,16*1.75,16*2.125, 20*2.125

Kid's bike tire