A 9m diameter vehicle fits in our existing factories …
— Elon Musk (@elonmusk) July 22, 2017
Musk is talking about the scaled down version of the Interplanetary Transport System that he plans to unveil in Adelaide, Australia at the end of September. For comparison purposes, the vehicle he unveiled last year had a 12 meter diameter. Falcon 9 has a diameter of 3.7 meters. The diameter of the Saturn V was 10.1 meters.
UPDATE: The above graphic shows the engine layout for the ITS. It would seem they would lose 21 outside engines by shrinking the diameter to 9 meters. That would leave the ITS with 21 Raptor engines on the first stage.
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