After making its debut in Pebble Beach earlier this year, BMW's Z4 concept makes an appearance on the automaker's home turf at the 2017 Frankfurt auto show.

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Where the production Z4 features a retractable hardtop, the concept makes do with a speedster's fixed open top and dual roll hoops.

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It's amazing how this front end, which features many of the same design hallmarks as the 8 Series concept, can look so very different.

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At this point, BMW's not talking specs, but we know that the new rear-drive platform was developed in a joint venture with Toyota and will also underpin the next-generation Toyota Supra.

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Expect some version of the automaker's turbocharged four- and six-cylinder engines to find a place under the elongated hood.

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The concept's design integrates a duck-tail spoiler into the trunk's lid.

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Peer into the cabin to find a driver-centric cockpit with a two-tone design. The driver's seat and control surfaces are dark gray, while the passenger's seat and space feature a copper color that matches the exterior.

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Character lines stretch away from the surface in a manner that reminds me of the fabric-clad BMW Light GINA concept from many years ago.

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The proportions and overall style are reminiscent of the previous generation Z4, but BMW also draws inspiration from the short-lived Z8 roadster.

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We expect to learn more about the production car this concept spawns sometime next year. In the meantime, keep clicking for even more photos from Frankfurt.

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