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Technically the car ones would not be really as big as a building, also there would be a great difference in size between different robots as an F-15 is much larger than a Lamborghini. So obviously Transformers that turn into cars can't be as big as Seekers. I don't know if it's a fact that Transformers other than Cassetticons change size as they transform.

you forgot the obvious "size changing" transformer: G1 Megatron

Yup, plus Soundwave, the cassettes.. Some of the combaticons, the comic version insecticons..

The cartoon seemed to take the biggest liberties with size/mass shifting.

Originally posted by Tenebrous
you forgot the obvious "size changing" transformer: G1 Megatron

I've never noticed that

basically,transformer tech allows for a subspace pocket dimension,so as to store any additional mass

Which Bay then denied of all the cool characters, in favour of equal mass......only to fu*k the whole thing up by then having a mass shifting cube..... the imbeciles.