This question is about Nutrition and Cycling
Cyclists who ride for more than 2 hours a day need to eat at least 60% of calories from carbs to perform at their best or 5-8g/kg of body weight per day. For cyclists who ride less than 2 hours per day, about 45-55% of calories should come from carbs, which equates to 3-8 g/kg body weight per day [ 1]
Adequate carbohydrate is important for cycling because carbohydrate is the preferred fuel of working muscles, and depleting carbohydrate stores can lead to fatigue and poor performance [1]
[1] Kerksick, C.M., Wilborn, C.D., Roberts, M.D. et al. ISSN exercise & sports nutrition review update: research & recommendations. J Int Soc Sports Nutr 15, 38 (2018). https://doi.org/10.1186/s12970-018-0242-y