transmission had five forward gears and one reverse gear to drive the forward-mounted drive sprocket. The suspension was a smaller version of that used in the Panzerkampfwagen 38(t). It consisted of four large road wheels per side, each pair mounted on a wheel carrier and sprung by leaf springs. There were two wheel carriers per side. The idler wheel was at the rear and one return roller was fitted. It had a ground pressure of only 0.5 kg/cm2. It could cross a ditch wide, climb an obstacle high and ford a stream deep. Variants Iran: RH (AH-IV-P) Iran was the first customer for the AH-IV and ordered fifty plus a prototype in 1935 for delivery the following year. Deliveries began in August 1936 with the last batch arriving in Iran in May 1937, although the armament was shipped separately and wasn't installed until November 1937. The Iranians were well pleased with their vehicles and planned to order between 100 and 300 additional AH-IVs, but the outbreak of World War II prevented any follow-through. Their tankettes were the smallest of the series at only and differed only slightly in size from the Romanian R-1 tankettes that followed it on the production lines. It could only climb an obstacle high, had a range of and a ground pressure of only 0.45 kg/cm2. It used the ZB vz. 26 and 35 machine guns. Romania: R-1 (AH-IV-R) The Romanians signed a contract for 36 AH-IV-R, as they were designated by ČKD, on 14 August 1936, including one prototype to be delivered in two months and the entire order in seven months. These deadlines were unable to be met as the Romanians demanded many changes, which all had to be made on the production line because ČKD had initiated production of the entire order before the prototype was accepted. The first ten tankettes off the production line were sent to Romania in October 1937 to participate in the autumn maneuvers when they made a favorable impression before being returned to the factory. The production run was completed the next month, but the Romanians refused to accept them as they didn't conform to the specifications. The required modifications took until April 1938 to perform, but another evaluation was required under summer conditions and they weren't formally accepted until August 1938. Nicolae Malaxa bought a license to produce the R-1 as the AH-IV-R was known in Romanian