A drive train for a human-powered vehicle comprises a drive unit, a sprocket arrangement, and a total gear range quotient. The drive unit includes a motor configured to impart propulsion to the human-powered vehicle. The sprocket arrangement is operatively coupled to the drive unit. The sprocket arrangement comprises a plurality of rear sprockets and a plurality of gear ratios respectively corresponding to the plurality of rear sprockets. The plurality of gear ratios includes a largest gear ratio and a smallest gear ratio. The total gear range quotient is obtained by dividing the largest gear ratio by the smallest gear ratio. The total gear range quotient is larger than 5.

A drive train for a human-powered vehicle comprises a drive unit, a sprocket arrangement, and a total gear range quotient. The drive unit includes a motor configured to impart propulsion to the human-powered vehicle. The sprocket arrangement is operatively coupled to the drive unit. The sprocket arrangement comprises a plurality of rear sprockets and a plurality of gear ratios respectively corresponding to the plurality of rear sprockets. The plurality of gear ratios includes a largest gear ratio and a smallest gear ratio. The total gear range quotient is obtained by dividing the largest gear ratio by the smallest gear ratio. The total gear range quotient is larger than 5.

A bicycle front derailleur that is movable between shift positions in association with an indexer. The inner mechanical end stop is adjusted at the first indexing position so there is no loosening of the control cable in the last downward gearshifting operation, with the benefit of an immediate and rapid response in the first upward gearshifting operation. The outer end stop is adjusted to interrupt the rotation of the cable-winding bush before it reaches the last indexing position. This pair of mechanical end stops limits the excursion of the derailleur to prevent it being able to shift the chain too much towards the frame or too much away from the frame, which ensures that the chain is not shifted beyond the gears.

A bicycle front derailleur that is movable between shift positions in association with an indexer. The inner mechanical end stop is adjusted at the first indexing position so there is no loosening of the control cable in the last downward gearshifting operation, with the benefit of an immediate and rapid response in the first upward gearshifting operation. The outer end stop is adjusted to interrupt the rotation of the cable-winding bush before it reaches the last indexing position. This pair of mechanical end stops limits the excursion of the derailleur to prevent it being able to shift the chain too much towards the frame or too much away from the frame, which ensures that the chain is not shifted beyond the gears.

The disclosure provides a bicycle front derailleur including a fixing component, a chain guiding component, a linkage assembly, a battery assembly, two terminals, a circuit board assembly and a driving module. Two opposite ends of the linkage assembly are respectively and pivotally disposed on the fixing component and the chain guiding component. The battery assembly includes a battery holder and a battery. The battery holder is disposed on the fixing component, and the battery holder has a battery slot. One terminal is disposed in the battery slot, and the battery is removably inserted into the battery slot and is electrically connected to the terminal. The circuit board assembly is disposed on the fixing component and electrically connected to the other terminal. The terminals are electrically connected to each other. The driving module is disposed on the fixing component and electrically connected to the circuit board assembly.

The disclosure provides a bicycle front derailleur including a fixing component, a chain guiding component, a linkage assembly, a battery assembly, two terminals, a circuit board assembly and a driving module. Two opposite ends of the linkage assembly are respectively and pivotally disposed on the fixing component and the chain guiding component. The battery assembly includes a battery holder and a battery. The battery holder is disposed on the fixing component, and the battery holder has a battery slot. One terminal is disposed in the battery slot, and the battery is removably inserted into the battery slot and is electrically connected to the terminal. The circuit board assembly is disposed on the fixing component and electrically connected to the other terminal. The terminals are electrically connected to each other. The driving module is disposed on the fixing component and electrically connected to the circuit board assembly.

A chain guide comprises a first guide member and a second guide member. The first guide member includes a first guide plate. The second guide member includes a second guide plate and an extending part. The extending part extends from the second guide plate toward the first guide plate. The extending part includes a first extending part and a second extending part. The first extending part has a first end portion, a second end portion, and a first intermediate portion. The second extending part has a third end portion, a fourth end portion, and a second intermediate portion. The first intermediate portion is spaced apart from the second intermediate portion. The first end portion is coupled to the second guide plate. The third end portion is coupled to the second guide plate. The second end portion is coupled to the fourth end portion.

A chain guide comprises a first guide member and a second guide member. The first guide member includes a first guide plate. The second guide member includes a second guide plate and an extending part. The extending part extends from the second guide plate toward the first guide plate. The extending part includes a first extending part and a second extending part. The first extending part has a first end portion, a second end portion, and a first intermediate portion. The second extending part has a third end portion, a fourth end portion, and a second intermediate portion. The first intermediate portion is spaced apart from the second intermediate portion. The first end portion is coupled to the second guide plate. The third end portion is coupled to the second guide plate. The second end portion is coupled to the fourth end portion.

A bicycle front shifting system includes operable to transmit a wireless signal, a crank assembly with two crank arms and a pedal on each of the two crank arms. The crank assembly is rotatable about a rotation axis. A front shift unit is coupled to the crank assembly and is rotatable about the rotation axis. The front shift unit includes a chain ring component with a big chain ring and a small chain ring. The small chain ring has a small diameter and the big chain ring has a big diameter that is larger than the small diameter. A shift mechanism is coupled to and rotatable with the chain ring component about the rotation axis. The shift mechanism is configured to receive the wireless signal from the shifter and to shift a chain between the big chain ring and the small chain ring according to the wireless signal.

A crank assembly comprises a crank arm, a front sprocket unit, and a plurality of chain-drop control protrusions. The plurality of chain-drop control protrusions is configured to inhibit a drive chain from getting into a space provided radially inwardly from the plurality of chain-drop control protrusions and between the crank arm and the front sprocket unit in an axial direction. The plurality of chain-drop control protrusions is configured to be provided to at least one of an axially inwardly facing crank-surface of the crank arm and an axially outwardly facing sprocket-surface of the front sprocket unit. The plurality of chain-drop control protrusions is spaced apart from each other in a circumferential direction with respect to the rotational center axis.