In fact, this bike is really hard to ride, it’s not as good as a modern little yellow bike!
Since the pedals of this car are placed directly on the axis of the front wheel, the power of the car is mainly transmitted through the crank rocker linked to the pedals. When the pedals rotate once, the front wheel also rotates. It would be too difficult to make the car go faster under such circumstances!
If it weren't for Li Zexuan's martial arts skills, he would have collapsed from exhaustion just from Yunshan to Chang'an. How could he have the energy to carry Lan'er around?
Because the body of a modern bicycle is driven by a chain, there is a larger transmission ratio between the front and rear gears. Generally, one turn of the pedal will drive the rear wheel to turn several turns. The so-called variable-speed bicycle has a large transmission ratio between the front and rear gears. A flywheel is added in place, which is a gear that can change the number of teeth.
Y represents the gear ratio, C represents the number of teeth of the driving gear, and n represents the number of teeth of the passive gear. The relationship between them is expressed by a formula, that is, Y=c/n. For example: the wheel plate of a certain car has 48 teeth and the flywheel has 16 teeth. Substituting into the formula, the gear ratio is 3. That is to say, when you pedal the wheel once, the flywheel will rotate three times, which means the rear wheel will rotate three times.
Although increasing the gear ratio can speed up the bicycle, don't ignore it. The chain drive in this case is a laborious lever. The larger the gear ratio, the harder it is to pedal. Based on this comprehensive consideration, in actual situations, regardless of the bicycle For the models on the side, the gear ratio is about 2-4.
The gear ratio of a transmission vehicle is adjusted by changing the gear ratio to save effort or increase speed.
Another problem is the rotating parts of various parts of the bicycle body. All the workshop can make now are roller bearings, and ball bearings cannot yet be made. The rollers also caused the bicycle in Li Zexuan's hand to run stiffly, the handlebars rotate inflexibly, and the wheel rolling friction loses a lot of kinetic energy. This makes it more difficult to ride this thing.
"Brother! Look! Look! Aren't those Sister Changle and Brother Prince?"
When riding to Dongshikou, Lan'er suddenly screamed excitedly.
"Chi~!"
When Li Zexuan heard Lan'er's voice, he quickly squeezed the brakes. A hoarse friction sound resounded on the street, and the bicycle stopped immediately.
"Ouch~!"
Due to inertia, Lan'er's head suddenly hit Li Zexuan's back, and the little girl couldn't help but let out a exclamation.
"Chengqian? Where is it?"
Li Zexuan supported the bicycle with his right foot, turned around and asked.
"Hmph! Dirty brother, you didn't even say a word to Lan'er when you parked your car!"
Lan'er rubbed her head and said with a flat mouth.
Of course, the little girl was definitely not really angry. After she complained about Li Zexuan, she said, "No, that's not the prince brother and... Hey! Brother, they are coming towards us!"
In fact, without her having to say anything, Li Zexuan had already found Li Chengqian and Chang Le among the crowd. The brother and sister were followed by two guards, and the guard was holding several brocade boxes in his hands. Presumably, they were out of the palace for shopping and had just finished shopping.
The hoarse sound of brakes from before instantly attracted the attention of the two brothers and sisters. When they saw Li Zexuan and Lan'er here, they leaned over.
"Ah! Brother Xiaoxuan! What kind of car are you pushing~?"
Changle trotted over and looked at the bicycle beside Li Zexuan with a surprised look on his face and said.
"Yes! Xiaoxuan! Why have I never seen this kind of car?"
Li Chengqian also walked up to Li Zexuan at this time. Seeing Lan'er sitting in the strange-looking car, he felt a sense of surprise in his heart and couldn't help but ask.
"Brother Prince is so stupid! This car is called a bicycle. It can run by itself, and it runs very fast!"
Seeing that Li Chengqian and Chang Le both looked like they had never seen the world, Lan'er suddenly felt a deep sense of superiority. She couldn't help but said to herself: "My mother-in-law said before that the prince brother and sister Chang Le were from the royal family and had noble status, but now it seems Come on, the royal family is not as good as our family!"
The little girl's thoughts are always so simple and innocent. If her family has a bicycle but the Royal family does not, then her own family is obviously better than the Royal family!
"Haha! That's right! This is a bicycle! It's just made in the workshop. It's normal for you, Chengqian, to have never seen it before!"
Li Zexuan held the bicycle with one hand, patted Lan'er's little head with the other hand, and said.
"Bicycle? This car can really walk on its own?"
Li Chengqian looked at the bicycle carefully and didn't believe it.
He always felt that a car like this would fall to the ground as soon as one let go of it. How could it possibly walk on its own?
In fact, this is not to blame for his short knowledge. The main reason is that ancient people often saw horse-drawn carriages and have formed a fixed mindset. Bicycles only have two wheels, and the two wheels are arranged one behind the other. Naturally, they are far inferior to the appearance of horse-drawn carriages. More stable.
Before Li Zexuan could say anything, Lan'er couldn't help but retort: "Why can't it be done! Lan'er and her brother came here on this car just now!"
Changle covered his mouth and smiled: "Sister Lan'er, it should be the car that brother Xiaoxuan is riding. Are you riding in the car?"
Lan'er's face was not red, her heart was not beating, and she said: "Yeah! That's what I want to express. Sister Changle, you are so considerate!"
This girl's sweetness can make people sick to death. Changle was so sweet that he said, "Haha! Lan'er, how does it feel to sit on this bicycle?"
Lan'er raised her head, thought about it seriously, and said, "Yeah! It's quite comfortable... just a little cold!"
To be honest, a bicycle is indeed faster than a horse-drawn carriage, but it is definitely not as warm as a horse-drawn carriage. After all, it is ventilated from all sides!
This somewhat cute and clever answer immediately made everyone laugh.
"Sister Changle, do you want to come up and try it too? It's really comfortable~?"
Seeing that everyone was laughing, Lan'er thought they didn't believe what she said, so she said again.
A hint of emotion immediately flashed in Changle's eyes. Li Chengqian glanced at Changle inadvertently. His heart suddenly skipped a beat and he said hurriedly: "Ahem! Changle, it's already late now. If the emperor and the empress are... I haven’t seen you for a long time, so I should be anxious!”
As an elder brother, Li Chengqian has actually discovered that Changle's feelings for Li Zexuan are different. He can't tell whether it is attachment to his eldest brother or the emotion between a man and a woman, but no matter what it is, Changle should not go with Li Zexuan. Too close. As for sharing a car, that’s even more impossible!
"...Hmm~! Then...brother Xiaoxuan, sister Lan'er, goodbye~!"
Changle shook his thin lips and said softly.
Wearing a pink palace dress, she looked even more pitiful under the sunset.
…………………………
