| abstract | - The Leyland Tiger Cub (coded as PSUC1) was a lightweight underfloor-engined chassis built by Leyland Motors between 1951 and 1970, most as 44-45 seat buses, with a smaller number as coaches. The standard bodied dimensions were 30ft (9.1m) long by 8ft (2.4m) wide, the UK maximum at launch in 1952. It was named when a lighter-weight chassis was introduced in 1952 as a modification to the older Leyland Royal Tiger (type PSU1), which was regarded by certain influential customers, especially in the BET group of privately-managed bus companies, as overweight, over-specified and too expensive, those who were operating it were also finding vacuum-servo versions under-braked. (note 1) It was powered initially by a Leyland O350H 91bhp 5.76-litre diesel engine, a horizontal version of the engine fitted to the Comet 90. It had a newly designed lightweight high straight frame with a vertical radiator set just behind the front axle. The launch transmission was the same four-speed constant mesh unit which had been used in the Tiger PS1, Titan PD1 and their export equivalents. There was a choice of either a single-speed or two-speed rear axle, both of spiral-bevel form and derived from the Comet 90 design, the latter using an electrically-actuated Eaton driving head in a Leyland casing. Wheels were of the 8-stud type and diaphragm-type air braking was standard. This was the first time Leyland had offered a bus chassis without another braking option, whilst vacuum or vacuum-hydraulic brakes were still standard across most of the UK bus and coach industry. (note 2)
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