The derailleur of a road bike changes the transmission ratio by adjusting the position of the chain on the chainring and flywheel to adapt to different road conditions and riding needs. The following is a detailed guide to using the derailleur of a road bike:
1. Basic operation of the derailleur
Front derailleur: Controlled by the left hand, used to adjust the position of the chain on the chainring. Adjust the chain to the large chainring (high transmission ratio) for flat roads or downhill, and adjust it to the small chainring (low transmission ratio) for climbing.
Rear derailleur: Controlled by the right hand, used to adjust the position of the chain on the flywheel. Adjust the chain to the large flywheel (low transmission ratio) for climbing, and adjust it to the small flywheel (high transmission ratio) for flat roads or downhill.
2. Timing and skills of shifting speed
Keep pedaling: Keep pedaling when shifting speed to ensure that the chain is smoothly hung on the new chainring or flywheel.
Shifting speed with the right foot on top: Shifting speed when the right foot is at the top of the pedal can reduce the loss of the transmission device.
Pre-judgment: Especially when climbing a slope, downshift in advance to avoid excessive chain tension and damage.
3. Speed shifting suggestions for different road conditions
Uphill: Adjust the front chainring to 1st gear and the rear flywheel to 1-6th gear to save effort and protect the transmission and knees.
Flat road: Adjust the front chainring to 2nd gear and the rear flywheel to 3-7th gear, which is suitable for maintaining speed and efficiency.
Downhill: Adjust the front chainring to 3rd gear and the rear flywheel to 5-9th gear, and upshift in advance to avoid stepping on the air.
4. Precautions for speed shifting
Avoid continuous speed shifting in multiple gears: Only adjust one gear at a time to avoid excessive pressure on the transmission.
No speed shifting when stationary: Adjusting the gear when stationary may cause the chain to be misaligned or damage the transmission.
Regular maintenance: Clean and lubricate the chain, chainring and rear derailleur system to extend its service life.
5. Principle of the transmission
Transmission ratio: The larger the front chainring and the smaller the rear flywheel, the higher the transmission ratio, which is suitable for high-speed riding; the smaller the front chainring and the larger the rear flywheel, the lower the transmission ratio, which is suitable for climbing.
Combining front and rear transmissions: When the road conditions change greatly, adjust the front transmission first, and then fine-tune the rear transmission to achieve the best riding effect.
By mastering the above techniques, you can use the road bike transmission more efficiently to adapt to different riding needs, while protecting vehicle components and extending their service life.
