The phrase "bald tires" refers to tires on a vehicle that have little or no traction left on them. It means that the tires are worn out and smooth, making them unsafe for driving, especially on wet or slippery roads. Full definition
While it may sound like a silly question to most of us, some people actually wonder — why they shouldn't drive on bald tires. (freewayinsurance.com)
And if it were about public safety, real auto inspections would be brought back to get the cars off the road with bald tires and worn brakes and no headlights. (ungerandkowitt.com)
Many environmentalists are eager to harvest fuel from bald tires and junk plastic. (discovermagazine.com)