BA-21
Encyclopedia
The BA-21 was an experimental Soviet armored car from 1938. It was a major modification of BA-20
BA-20
The BA-20 was an armored car developed in the Soviet Union in 1936 and used in the early stages of World War II.-Design and production:The BA-20 armored car was developed in 1934 for use by HQ staffs, reconnaissance and communications units...

, that used triaxial truck chassis instead of biaxial. Next year, the design was further developed into LB-23, which had a better engine. Both vehicles were not accepted for production.
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