How to Choose the Gear Size of the Rear Derailleur?

The selection of gear size for the rear derailleur depends on various factors, including the terrain, speed requirements, personal strength, and preferences. Here are some suggestions:
Terrain and Road Conditions: If the cycling route involves a lot of uphill climbs or undulating terrain, smaller gears are usually chosen to provide a higher gear ratio, helping to cope with hills and resistance. Conversely, for flat or downhill sections, larger gears can be selected to achieve higher speeds.
Speed Requirements: If you want to maintain a higher cycling speed, larger gears are typically chosen. However, if you prioritize a relaxed and comfortable cycling experience, smaller gears can be chosen to reduce pedaling effort.
Personal Strength and Preferences: Personal fitness level and preferences also affect gear selection. If you have strong physical strength, you may prefer larger gears to challenge higher speeds and resistance. On the other hand, if you prefer a relaxed cycling experience, you may prefer smaller gears to reduce pedaling load.
Taking into account the above factors, it is recommended that cyclists try different gear combinations in various cycling conditions to gradually find the best choice for themselves. In actual cycling, flexibly adjusting the gear size of the rear derailleur to meet current cycling conditions and personal needs is the key to achieving the best cycling experience.