Hello! I am currently training for a cross-country bike trip and having never biked through mountains, am concerned about my bike having a double crankset rather than a triple. I'm worried that I'll hurt my knees biking at gears which may not be ideal. I've heard many times that switching from a double to a triple is one of the most difficult and expensive repairs to do on a bike, so that doesn't seem like a viable option. I'm wondering if anyone has thoughts on biking through mountains with a double crankset and any advice on saving knees from too much strain?