Human: How can I tell if my bike tires need replacing? Assistant: 
To check if your bike tires need replacing, first inspect them for signs of wear and tear, like cracks in the rubber, punctures, or any visible damage. Then, check the tire pressure to make sure it is at the correct level for your bike. Finally, before taking your bike out for a ride, test spin the tires to ensure they are not balding, fraying, or otherwise not in good condition.