We loved our balance bikes. My then 6yo DD still couldn't ride a bike so DH grinded off the pedals and effectively made it a big balance bike, still took her a good few months. Poor kid got my coordination skills😂
DS1 had just turned 3 and was riding his big boy bike with pedals and never had training wheels because he learned how to balance using the balance bike.
And DS2 is 2.5 and pretty quick on the balance bike now and learning how to balance and lift his feet.