In order to evaluate the tire - vehicle - terrain system, the tire- road characteristics should be determined carefully. This needs theoretical model and / or practical testing under controlled environment which can be fulfilled using a soil bin. Before this work, such facility did not exist in Egypt. Accordingly; the objective of this work was set to design, produce, and assemble a test rig for dynamic evaluation of off-road tire characteristics (soil bin). The constructed soil bin mainly consists of a single driven tire traction tester, towing resistance, measuring equipment , and testing track containing the tested soil. The measured data ( the input driving torque, the net traction, the sinkage, and the tire revolutions) can be recorded on a digital data acquisition system and processed using a computer.