What combination is used for the front and rear gear discs of mountain road speed change?

mountain road shifting? Zane bicycle manufacturer brings you the following introduction:

The road surface is uneven, and it cannot be avoided up and down slopes. Therefore, it is necessary to adjust the gear plate to adapt to the riding road conditions. Under the condition that the rear gear plate cannot cope with the changes, it is necessary to consider changing the front gear. If only the front gear is changed, the gear ratio will often be too large, and then the rear gear plate will be changed to reduce the pedaling force.
1. Lower the front gear plate and raise the rear gear plate.

2. Highlight the front toothed disc and the rear toothed disc.

The shift levers on the left and right sides need to be adjusted at the same time until the easiest to operate is selected. Generally, it is a combination of two kinds: front outside, back inside, front outside and back inside.

is:

1. The front large toothed disc and the back large toothed disc
2. The front small toothed disc and the back small toothed disc

Of course, some people do not approve this combination, because it will cause the chain to tilt, greatly reduce the transmission function of the chain and accelerate the chain loss. In addition, the chain will also rub against the toothed disc next to it, and the loss will be relatively large.

Mechanical disc brakes and hydraulic disc brakes actually have the same purpose to achieve, that is, to transmit the force of the grip to the brake pad through the medium, so that the brake pad and the disc generate friction, and then convert kinetic energy into heat. To achieve the braking function. The main difference between the two lies in the medium used to transmit power. To put it plainly, the principle of the wire disc and the V brake is the same, and both rely on the wire to transfer the force to the brake; as for the hydraulic disc brake, it is used The principle of the connecting pipe uses oil as the medium. Therefore, the hub drum and the disc in their structure can be the same, the main dimensions are the same, and there is no problem in common use.