In fact, this bike is really not easy to ride, and it is not as good as a modern little yellow car!

Since the pedal of this car is directly placed on the axle of the front wheel, the power of the car is mainly transmitted by the crank rocker linked to the pedal, the pedal turns a circle, and the front wheel also rotates a circle, in this case, it is too difficult to make the speed of the car faster!

If it weren't for Li Zexuan's martial arts, it is estimated that he would have been tired from riding from Yunshan to Chang'an, where would he have the spare strength to carry Lan'er around?

Modern bicycle because the body is driven by a chain, there will be a large transmission ratio between the front and rear gears, under normal circumstances, the pedal turns a circle, it will drive the rear wheel to rotate several times, the so-called variable speed bicycle is to add a flywheel at the place of the rear wheel, that is, the gear that can change the number of teeth.

Y represents the gear ratio, C represents the number of teeth of the driving gear, n represents the number of teeth of the passive gear, and the relationship between them is expressed by the formula, that is, Y = c/n For example: the wheel disc of a car is 48 teeth, and the flywheel is 16 teeth, and the gear ratio can be found to be 3 by substituting the formula. That is to say, pedaling the roulette wheel for one week, and the flywheel for three weeks, that is, the rear wheel for three weeks.

Although it is said that increasing the gear ratio can speed up the bike, it should not be ignored that the chain drive in this case is a laborious lever, and the larger the gear ratio, the more laborious the pedaling, based on this comprehensive consideration, in the actual situation, regardless of the model on the bicycle side, the gear ratio is about 2-4.

The gears of the transmission car are adjusted by changing the gear ratio to adjust the transmission ratio, so as to achieve the purpose of saving effort or increasing speed.

Another problem is the rotating parts of the bicycle body, all the workshop can do now is roller bearings, ball bearings can not be done. The roller also caused the bicycle in Li Zexuan's hand to run more jerky, the handlebar rotation was not flexible, and the friction kinetic energy loss of the wheel rolling was large. This makes it more strenuous to ride.

"Brother! Look! Look! Isn't that Sister Changle and Brother Prince? ”

When riding to the entrance of the East Market, Lan'er suddenly screamed excitedly.

"Huh~!"

When Li Zexuan heard Lan'er's voice, he hurriedly pinched the brakes of the car, and a hoarse friction sound resounded on the street, and the bicycle immediately stopped.

"Oops~!"

Due to inertia, Lan'er's head hit Li Zexuan's back all of a sudden, and the little girl couldn't help but let out an exclamation.

"Cheng Qian? Where? ”

Li Zexuan supported the bicycle with his right foot and turned his head to ask.

"Humph! Stinky brother, don't say a word to Lan'er when you park! ”

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's brother and ...... Ay! Brother, they're coming towards us! ”

Actually, needless to say, Li Zexuan has also found Li Chengqian and Changle in the crowd. The brother and sister were followed by two guards, and the guards were still holding several brocade boxes in their hands, presumably they should have gone out of the palace to go shopping and had just finished shopping.

The hoarse sound of brakes before instantly attracted the attention of the two brothers and sisters, and as soon as they saw Li Zexuan and Lan'er here, they leaned over to this side.

"Yikes! Brother Xiaoxuan! What kind of car are you pushing~? ”

Changle trotted all the way over, looked at the bicycle beside Li Zexuan with a look of surprise, and said.

"Yes! Xiao Xuan! Why have I never seen a car like this before? ”

Li Chengqian also walked to Li Zexuan's side at this time, and when he saw Lan'er sitting in the strange-looking car, he felt a burst of surprise in his heart, and couldn't help asking.

"Brother Prince is so stupid! It's called a bike, and it can run on its own, and it's fast! ”

Seeing that Li Chengqian and Changle both looked like they had never seen the world, Lan'er suddenly had a deep sense of superiority, and she couldn't help but say: "A-Niang said before that Brother Prince and Sister Changle were born in the royal family and have noble status, but now it seems that the royal family is not as good as our family!" ”

The little girl's mind is always so simple and naïve, her own family has a bicycle, but the royal family does not, then obviously her own home is better than the royal family!

"Huh! That's right! That's the bike! The workshop has just been made, and it's normal that you haven't seen it! ”

Li Zexuan held the bicycle with one hand, patted Lan'er's little head with the other, and said.

"Bikes? Can this car really walk on its own? ”

Li Chengqian took a serious look at the bicycle a few times, and said with some disbelief.

He always felt that this kind of car, as soon as people let go, they would fall to the ground, how could they walk on their own?

In fact, it's no wonder that he has a short vision, mainly because ancient people often saw horse-drawn carriages, and they have formed a mindset, bicycles only have two wheels, and the two wheels are still arranged one after the other, which is naturally far less stable than the carriage.

Before Li Zexuan could speak, Lan'er couldn't help but retort: "Why can't it!" Lan'er and her brother came here on this bike just now! ”

Changle covered his mouth and smiled: "Sister Lan'er, it should be the car that Brother Xiaoxuan is riding, you are in the car, right?" ”

Lan'er's face was not red and her heart was not beating, and she said, "Mmmm! People just want to express this meaning, Sister Changle, you are so understanding! ”

This girl's mouth is sweet and can get tired of death, Changle is filled with sweetness, "Hehe! Lan'er, how does it feel to sit on this bike? ”

Lan'er tilted her head, thought about it thoughtfully, and said, "Hmm! It's pretty comfortable...... It's just a little cold! ”

To be reasonable, it's true that bicycles are faster than horse-drawn carriages, but this thing is definitely not as warm as horse-drawn carriages, after all, it is windy on all sides!

This answer with a bit of cuteness and agility immediately made everyone laugh.

"Sister Changle, do you want to come up and try it too? It's really comfortable~? ”

Lan'er saw that everyone was laughing, and thought that they didn't believe what she said, so she said again.

Changle's eyes immediately flashed with a touch of emotion, Li Chengqian inadvertently glanced at Changle, his heart suddenly chuckled, and hurriedly said: "Ahem!" Changle, this hour is not early, if the father and the queen mother can't see you for a long time, they should be in a hurry! ”

As an elder brother, Li Chengqian has actually discovered that Changle's feelings for Li Zexuan are not the same, he can't tell whether it is the attachment to his eldest brother or the emotion between men and women, but no matter what it is, Changle should not get too close to Li Zexuan. As for such a thing as a carpool, it is even more impossible!

"Hmm~! Brother Xiaoxuan, Sister Lan'er, goodbye~! ”

Changle shook his thin lips and said softly.

Dressed in a pink palace dress, she looks even more pitiful in the sunset