Tyre contact patch

#1

1960’s racing.
50cc, 15ish bhp, about 65kg. In the rain.

Along the same lines, this is an amazing machine. http://www.bikeexif.com/suzuki-rk67

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#2

I bet there’s an equally sized brown patch on the leathers

#3

God, those tyres look almost square! You had to be seriously brave to race bikes back then.

#4

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.