Can’t decide if tracks or tyres are the best option for your tractor? This concept tractor from Claas combines the best of both worlds.

The Etrion 400, designed by automotive engineering student Merlyn Gray, has four driven wheels at each corner and independent Terra Trac units between. These can be lowered hydraulically to reduce compaction and lifted on the headlands to prevent scuffing. They would also be raised for road work to increase transport speeds and give a smoother ride.

It has four-wheel steer and apparently can spin on a sixpence when the track units are fully lowered.

Agritechnica 2011