How Much Lighter Is The Carbon Fiber Frame Of A Road Bike Compared To An Aluminum Frame? How Does Weight Affect Climbing Efficiency?

When I bought a car before, I tried the carbon fiber frame. I really noticed a significant difference in weight. After doing some careful research, I found that the weight difference between the carbon fiber frame and the aluminum frame of a road bike mainly depends on the material grade and design positioning.
Among frames of the same level (such as competition-level), the weight of carbon fiber frames usually ranges from 800 to 1100 grams, while aluminum frames typically weigh between 1300 and 1600 grams, with a difference of approximately 300 to 600 grams. The gap for entry-level models might be slightly smaller (200 to 400 grams), as the manufacturing process of aluminum frames has improved, carbon fiber entry-level models will also be slightly heavier to ensure strength.
The impact of weight on climbing efficiency is direct and significant. During climbing, gravity is the main resistance. For every additional 1 kilogram of load, an extra 5-8 watts of power needs to be output at a 5% slope to maintain the same speed. A 300-600 gram (approximately 0.3-0.6 kilograms) lighter frame can correspondingly save 1.5-4.8 watts of power. Continuous climbing (such as over 10 kilometers) will significantly reduce physical exertion. Moreover, the "dragging sensation" of the lightweight frame is weaker, and the response when pedaling is more direct. Especially for riders with lighter weight (below 65 kilograms) or with average strength, the difference in body sensation is more prominent.
If the proportion of uphill sections during cycling is high (such as over 30%), the lightweight benefits of carbon fiber become very obvious; if the main terrain is flat, the perception of speed difference is relatively weak, and factors such as wind resistance need to be comprehensively considered. Regardless of the price, just go for carbon fiber with your eyes closed!