Riding a road bike, sitting on the saddle, your feet can touch the ground, and your toes can touch i

Normally, it should be short, and we ride on the bicycle without touching the ground on our toes.

Either you have a small frame and a low bottom bracket height, so you may be able to barely touch the ground on your toes.

The correct height is that if you ride up and press the pedal with your heel to the end, and your legs are just straight, the height of the saddle is appropriate.

As for the adjustment of the front and rear positions of the cushion, it does not mean that it is comfortable to adjust the cushion one position back, too far back will lead to incorrect force angle.

You can ride on it and pedal normally, and when you step to the bottom, if your legs are just perpendicular to the ground, the saddle will be positioned in the front and back of the seat.

Of course, there is no regulation on the length of the seatpost for as long as you like.

a. The self-propelled BAI car is too fast, and when encountering an emergency situation, it is not easy to stop due to inertia.

DAOs are prone to cause harm, therefore.

The version is correct and does not conform to the topic;

Right b, the chain and the two gears connected to the equipment is not a pulley group, is the axle knowledge of the wrong statement, in line with the topic; c. The brake on the handlebar can be pressed to the steel ring of the wheel with a large pressure with a small force, so that the pressure can be increased and the friction can be increased, which is correct and does not conform to the topic; d. Pedal a few times before going uphill, so that the kinetic energy of the car can be increased, so that the kinetic energy will be converted into gravitational potential energy, so as to climb higher, the statement is correct, not in line with the topic; Therefore, choose B

The good thing is that cycling can develop the brain and improve physical fitness. Cycling is an effective way to strengthen the muscles of the lower limbs and strengthen the endurance of the whole body. The harm is: damage to the spine and lumbar spine.

The only thing that works best is diet and exercise! I only eat lunch one day, and I only drink water for the rest of my breakfast and dinner! Be sure to exercise! The most effective thing is: jump rope! Trust me, just give it a try! I'm sure I'll be thin! Good luck!

So many benefits of cycling! No other sport can be compared, how much do you know?

The comparison of about 3000 is real.

Since you mentioned the word "outdoor sports".

There are two more professional types: mountain bikes and road bikes.

A mountain bike of the same quality is a little more expensive.

It's hard to say the price point of all the bikes. If it is less than 100 yuan, it must not be bought. Overall, I divide the bikes into three categories:

400-1500 yuan for household type, 2000-5000 yuan for general amateur type, 6000-10000 yuan for professional amateur type (just summary data). Higher ones are generally more specialized.

If you're a beginner, it's not the main factor you consider, you can choose around 1500.

If you're more sensitive, you can consider around 500. In the lower grades of mountain bikes and road bikes, there is not much difference in quality. Of course, the uses are varied.

This depends on the brand, in fact, one or two sentences are not clear.

Thousands to tens of thousands are possible.

For amateur play, it is generally about 1500, a better one is 2000 to 3000, and a professional one needs tens of thousands.

It seems to be around 1200-1500, which is about the same as an electric car.

1500 or so will do, mine is 1680, Merida's.

Giant's, good, 1000 to 1500, very good quality amount.