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Grinduro 2018 sponsors include Giro, Fabric and SRAM

The Giro-owned events, in California and Scotland, are in the fourth year. SCOTTS VALLEY, Calif.

Giro launches Grinduro: a race that combines enduro and gravel grinding

QUINCY, Calif. (BRAIN) — Giro Sport Design is producing a new event this fall near its California headquarters. The Grinduro is a 60-mile competition on dirt and pavement with elements of gravel road racing and mountain bike enduro competitions. The winners will be determined based on performance over four relatively short timed sections within the course