Whats the optimal tire pressure setting for gravel and road riding, considering the varying conditions and surfaces encountered on a typical ride? Should riders prioritize lower pressure for comfort and traction on rough gravel sections, or higher pressure for efficiency and speed on smoother road stretches? Are there specific pressure ranges that work best for different types of gravel and road surfaces, such as chip seal, asphalt, or dirt roads? How do factors like tire width, tread pattern, and rider weight influence the ideal pressure setting? Are there any general guidelines or rules of thumb for adjusting tire pressure based on the specific terrain and conditions of a ride?