The first company to crack this mold was arguably Vincent Motorcycles. Designed as a gentleman's touring bike, their model's speed was astounding for days when motorways and freeways didn't exist. However, its handling was basic, and its shortcomings became clear when faced by a motorway - girder forks.
In the 1960s two bikes were developed which could be both daily commuter as well as weekend racer. These were the first sport bikes. The first was the BSA Rocket 3/Triumph Trident, closely followed by the Honda CB750K.
The 1971 Kawasaki Z1, however, with its 900 cc (54.9 cu in) DOHC engine finally started the era of the modern sport bike. The Z1 sold so well that by the end of that decade the Japanese manufacturers were all building competing machines similar to the Z1 with its DOHC inline-4 engine configuration. The resulting "bike war" among the Japanese manufacturers and required investment in modern engine manufacturing contributed to the demise of the flagging British motorcycle industry.
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