On 27 September 1939 AMX presented its new suspension system. It resembled that of the Renault R35, with two bogies, horizontal springs — be it here of the oil type — and five road wheels per side. The prototype also had a new "Chausson" radiator and more comfortable suspended crew seats. The new type however was not tested immediately; only after also Renault had presented another prototype, this time with seven road wheels — an extra wheel having been inserted in the space created by moving the bogie assembly twenty centimetres backward — both types were simultaneously compared between 7 and 23 February 1940. It was shown that the AMX suspension, though much sturdier, had a negative influence on the performance: speed and range fell with about 15%, mostly due to an incorrect weight distribution. The new seats, though clearly adding to crew comfort, were too high, preventing a soldier of normal length from closing the hood. However the new Renault suspension offered no clear advantages over the older model in terms of vibration level and crew fatigue, so both models were in the end rejected as possible modification projects of existing vehicles; AMX's type on 11 April 1940 was judged not to be acceptable for future production.