Six fire-fighers were pressed into service to douse the flames, which was brought under control over two hours later, police said.
Though the exact cause of the fire could not be ascertained yet, short circuit is suspected to be behind it, Officer-in-charge of Olidih Police station Mukesh Kumar said.
Kumar said 30-35 motorcycles including one worth Rs 16 lakh was badly damaged in the fire.
The alertness of a police patrolling team, who swing into action immediately after seeing smoke coming out of the showroom, stopped the fire from spreading to the vicinity. he said.
The show room was opened only a few months ago.