The demand for even heavier duty tractors grew rapidly in the mid-sixties. The UR1 range of Zetors ranged from approximately 25 to 60 hp and were lacking sufficient robustness and power for the arable farmers in Central Europe. In 1968, the development of UR2, the second Zetor Unified Range, was completed. The UR2 was better known as the "Zetor Crystal" range of tractors. It was the first range of tractors ever produced that had a flatbed cab with an integrated roll protection system. At the time, the Zetor Crystal was probably the most technological tractor around.
What other manufacturers offered as optional extras, or failed to offer at all, Zetor included on the Crystal range as standard equipment.
Ten years after the first UR2 tractor was produced, Zetor introduced turbochargers to the Crystal range. The four cylinder engine, when fitted with a turbocharger, was rated at 100hp. The six cylinder version in comparison could be turbocharged up to 160hp.
The Zetor Crystal series contained the following models: 8011, 8045, 10011, 10045, 12011, 12045, and the 16045 which was downtuned and sold as the 14045 in some countries (including England).
Production of the Zetor Crystal range ceased in 1989