Hercules is still trying to determine exactly how many tires are involved in the recall, spokeswoman Suzanne Mitchell said Monday.
The tires were made in China and sold by Hercules, which is based in the Findlay, Ohio.
Hercules says in documents sent to government safety regulators that the separations could reduce a driver's ability to control a vehicle. At least one crash was reported. Mitchell would not comment when asked if the problem has caused any other crashes or any injuries.
"We're looking to make this as successful of a recall as we can for our customers," she said.
Hercules will replace the tires for free. Owners can call the company at 888-965-5795.
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