Motorcycle sales last month declined 3.04% to 9,53,322 units, from 983,210 units a year earlier, according to data released by the Society of Indian Automobile Manufacturers (SIAM).
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Total two-wheeler sales in May slumped 1.25% to 13,80,950 units.
However, sales of commercial vehicles grew 3.95% to 48,841 units in May, SIAM said.
Vehicle sales across categories registered a decline of 0.58% to 16,83,962 units, from 16,93,740 units in May 2014, it added.