Question: how tall are goku and vegeta?
Answer: Goku's 'official' height is 5'9, just as Vegeta's is 5'5, and Bulma's is 5'5. But Goku is clearly far taller than Bulma, the top of her head near his shoulders, and Vegeta is also half-a-head taller than Bulma. It's only in Super that he seems to be getting taller and closer to that 5'5, 5'6 range.