When it comes to mountain bike gearing options, what are the key considerations for riders who frequently encounter varied terrain and elevation changes in a single ride? How do the different types of drivetrains, such as 1x, 2x, and 3x, impact the riding experience in terms of weight, efficiency, and ease of use? Are there any specific gearing configurations that are better suited for certain types of terrain, such as steep climbs or technical descents? What role do factors like cadence, power output, and personal riding style play in determining the optimal gearing setup? Are there any emerging trends or technologies in mountain bike gearing that are worth considering, and how might they impact the way we think about gear selection in the future? What are some common mistakes or misconceptions about mountain bike gearing that riders should be aware of, and how can they avoid them?