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am i correct in thinking that if a model terminator armour then they cant ride a juggernaut of khorne

Yes.

Terminators cant ride anythink. No to juggernaut ,no to bikes.

where does it say that in the rules

I think its specified under when you select terminator armour, anyway i don't think it exists in any codex having terminator's ride anything.

New transformers movie has Optimus prime riding a dinobot so maybe thats a precedent.

It is in the equipment list. The footnote reveals them as mutually exclusive.