True or False: The two small screws on a derailleur are for fine-tuning settings.

The assertion that the two small screws on a derailleur are for fine-tuning settings is false. In reality, these screws serve specific purposes related to the shifting mechanism of the derailleur. One screw is typically known as the high limit screw, which determines how far the derailleur can move towards the smallest (highest gear) cog. The other screw is the low limit screw, which sets the limit for the derailleur's movement towards the largest (lowest gear) cog.

These adjustments are not just for fine-tuning but are crucial for ensuring the derailleur operates effectively within its designated range. Incorrect adjustment can lead to poor shifting performance or even damage to the drivetrain. Therefore, while fine-tuning is an essential part of bicycle maintenance and setup, it is more accurate to say these screws are for limit adjustments rather than general fine-tuning.

Other options introduce concepts like limited applicability or dependence on professional adjustment, which do not align with the core function of the screws in typical derailleur setups across various bike types.