Rex-JAP were motorcycles produced from 1912 to 1916, by the Rex firm of Coventry, and sold by the Premier Motor Co of Birmingham.
They produced a range of singles and V-twins using JAP engines in their existing frames. To begin with the machines had two-speeds and belt drive, but by 1914 there were only V-twin engines, but with three speeds and all-chain drive.
Thus they continued until 1916, but were not revived after the war.
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