The phrase "flat tire" refers to a situation where the tire on a vehicle doesn't have enough air inside and is no longer round, making it difficult or impossible to drive. Full definition
It did originally came with run flat tires, but like many others I choose to run conventional tires. (mechanics.stackexchange.com)
This additional insurance pays a set amount of money toward certain types of assistance, such as towing, jump - starts and changing flat tires. (allstate.com)
Don't get caught with flat tires thanks to the included tire pressure monitoring system. (usedcarsgroup.com)