Subaru Rex K21
The rear-engined 'King' of the Japanese kei car era.
- Power
- 32 bhp
- Top speed
- 68 mph
- Est. value
- $3k–$8k
About the Subaru Rex K21
Launched in 1972 to replace the R-2, the Subaru Rex (K21) was a significant departure in styling, adopting a modern 'wedge' look inspired by the larger Leone. Despite the new body, it initially retained the rear-engine, rear-wheel-drive layout and the water-cooled two-stroke engine from its predecessor. The K21 was designed to meet strict Japanese kei car regulations, offering surprising interior space and a rear luggage compartment. It remains a cult classic in Japan, representing the final era of rear-engined Subaru microcars before the transition to front-wheel drive in the 1980s.
Subaru Rex K21 specs
The Subaru Rex K21 produces 32 bhp (24 kW) and 37 Nm (27 lb-ft) of torque. It has a top speed of 68 mph (110 km/h).
| Make | Subaru |
|---|---|
| Model | Rex |
| Generation | K21 |
| Trim | K21 |
| Years | 1972–1981 |
| Type | JDM |
| Body style | Hatchback |
| Country | Japan |
| Engine | 356cc water-cooled 2-stroke inline-2 |
|---|---|
| Displacement | 356 cc (0.4 litres) |
| Induction | Naturally aspirated |
| Power | 32 bhp (24 kW) at 6,000 rpm |
| Torque | 37 Nm (27 lb-ft) |
| Redline | 7,000 rpm |
| Top speed | 68 mph (110 km/h) |
| Transmission | 4-speed manual |
| Drivetrain | Rear-wheel drive |
| Weight | 480 kg (1,058 lb) |
| Power-to-weight | 67 bhp per tonne |
Typical figures for the standard car; options, markets and model years vary. Where our specs come from
How much is a Subaru Rex K21 worth?
A typical Subaru Rex K21 is estimated to be worth $2,500 – $7,500 (about £1,900 – £5,600).
Values are directional estimates for a typical example, not appraisals. Condition, mileage, history and specification all change what a real car is worth. Pound figures use the exchange rate of 3 November 2026. How values are estimated
Subaru Rex K21 rarity in CarSpot
The Subaru Rex K21 is an Uncommon card in CarSpot, with a rarity score of 20 out of 100. Hot hatches and premium sporty cars. An Uncommon card is worth 20 XP.
Each model's tier starts from a 0–100 score based on its value plus its power or production numbers. Once enough players have spotted a model, how often it is spotted can move it up or down one tier. How CarSpot rarity works
Rarity is a collectible game mechanic, not an assessment of real-world scarcity or value.
Subaru Rex K21 fun facts
- The name 'Rex' is Latin for 'King', chosen by Subaru to position the car as the leader of the competitive kei car segment.
- Early models used a two-stroke engine, but Subaru quickly transitioned to a four-stroke unit in 1973 to meet tightening emissions standards.
- The Rex was the first Subaru to feature the 'SEEC' (Subaru Exhaust Emission Control) system, a hallmark of their 1970s engineering.
