You will need to replace bike parts every so often. This depends on how often you ride and the conditions you ride in. Parts that get used a lot, like tires and brake pads, may need to be replaced more frequently due to wear and tear. Other parts, like the frame and crankset, may last longer. Regular maintenance, such as cleaning and lubricating the chain and checking for wear on the tires and brakes can help make your bike parts last longer.