>>1931548most of the ones itt don't need one since the drivetrain only drives one wheel.
>>1930237has a drivetrain attached to a thru axel to drive both rear wheels simultaneously, so there must be a diff somewhere although it's not visible in the pic I don't think . but little kid trikes that look like it don't have them since the drive is direct to the front wheel, the crank is on the wheel.
