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Kei car

Car culture term

Kei car
Photo: Retired electrician / Wikimedia Commons · CC0

What is Kei car?

Japanese vehicle classification with strict size and engine displacement limits (currently 660cc maximum). Includes commuter cars, vans, trucks, and a sports segment.

Kei car (kei-jidosha, "light vehicle") is a Japanese vehicle classification with strict regulatory limits on size and engine displacement. Current limits (as of 2024) are 660cc maximum displacement, 11.2 feet maximum length, 4.9 feet maximum width, and 6.6 feet maximum height. Vehicles meeting these limits qualify for tax and registration benefits in Japan, including reduced annual taxes, lower toll rates, and exemption from certain parking requirements.

The kei classification emerged after World War II to encourage affordable transportation in postwar Japan. The displacement limit started at 100cc in 1949 and was progressively raised to the current 660cc by 1990. Today, kei cars represent roughly 30 percent of new car sales in Japan, dominating commuter, urban, and rural transport segments.

The kei category includes city commuters (Daihatsu Move, Suzuki Wagon R), small trucks (Daihatsu Hijet, Suzuki Carry, Honda Acty), vans, and a small but iconic sports segment. The kei sports car trio (Honda Beat, Suzuki Cappuccino, Mazda Autozam AZ-1) of the early 1990s defined the kei performance segment. The Honda S660 (2015-2022) revived the category in the modern era.

Related terms

JDM

Frequently asked questions

Why are kei cars limited to 660cc?
The 660cc displacement limit was set in 1990 as the highest of progressive increases since the original 100cc limit in 1949. The limit balances providing useful power for daily driving while maintaining the kei category as a distinct, smaller-vehicle classification. The limit has remained 660cc for over 30 years.
Can kei cars be imported to the US?
Yes, after 25 years of age. A 1990s kei car (Suzuki Cappuccino, Honda Beat, etc.) can be legally imported to the United States now. Younger kei cars must wait. Some states have additional restrictions; California has been particularly strict on imported kei trucks. Import processes vary.
Are kei cars safe?
By modern standards, less safe than full-size cars. The small size limits structural crash space. Modern kei cars include airbags and modern safety features but are still smaller and lighter. For low-speed urban use, they are generally adequate. For highway driving in mixed traffic, they are more vulnerable.
Why are kei trucks popular in the US?
Practical workhorses for farms, ranches, and properties. Kei trucks (Suzuki Carry, Daihatsu Hijet, Honda Acty) are small enough to navigate tight spaces, capable of reasonable load capacity for their size, and inexpensive to import and maintain. They are often used as off-highway utility vehicles rather than registered for road use.
What is the most powerful kei sports car?
Modified kei cars can produce significant power. The factory limit is 64 horsepower (a gentleman agreement among Japanese manufacturers, not regulatory). Heavily modified kei sports cars (especially Cappuccino and Beat builds) can exceed 200 horsepower with larger turbos and supporting modifications, though doing so removes the kei classification.

Kei car on the blog

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