1960’s racing.
50cc, 15ish bhp, about 65kg. In the rain.
Along the same lines, this is an amazing machine. This Suzuki racing motorcycle has 14 gears | Bike EXIF
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I bet there’s an equally sized brown patch on the leathers
God, those tyres look almost square! You had to be seriously brave to race bikes back then.
The rear tyre, in the link, looks like it was probably a forerunner of the K81 Roadmaster which Dunlop later re-branded as the TT100.