650 SuperTwin racing will feature at next year's Southern 100 Road Races for the first time.
The class has proved to be popular over the past season at meetings in Ireland and at Oliver's Mount in Scarborough.
The schedule does have room following the announcement at the end of September that classic races were to be dropped from the Billown programme.
Two eight lap races for SuperTwins will take place on Wednesday evening and Thursday afternoon next July.
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