How to adjust these two screws on the rear dial of a mountain bike

This is difficult to describe accurately in words, and I will describe the steps in the form of **.

The following preparation is important and requires special attention.

Adjust the control back dial to the smallest flywheel blade.

<> see the name of the screw in the picture below:

Let's start the adjustment steps:

After <>, stir the pedal with your hand and let the crankset drive the rear wheel to rotate.

Control the dial to move from the smallest cassette, one gear, one gear to the largest cassette. If you hear a bad winding (click) on the chain halfway, turn the rear derailleur fine adjustment screw on the finger dial counterclockwise for 1 4 weeks, then step back one gear to the small flywheel, and then move into gear to the big flywheel (return to the gear that was not winding smoothly just now), and observe whether the winding is smooth (whether there is a click). If you do not continue to the large flywheel, if so, continue to adjust according to the red letter and then rotate the fine adjustment screw on the finger dial 1 4 weeks.

until the winding is smooth.

Every unwinding place is adjusted in this way, and the rear derailleur fine adjustment screws on the finger can not be rotated too much each time, only 1 4 weeks so that the adjustment is slow.

Until finally it goes up smoothly to the largest flywheel.

<> stop when in contact (do not rotate more), this is the adjustment screw, no need to tighten.

Note: The H and L screws on some rear derailleurs may be different from the H and L screws in the tutorial, but the adjustment method is the same.

Adjust the rear derailleur.

Before, be sure that the rear axle is straight, if the rear axle is curved, the flywheel swings left and right when turning, if the swing amplitude is large. This can't be adjusted.

It is to adjust the range, dial to the minimum and maximum gears, adjust one of the screws so that the lower gear is aligned with the upper gear.

Tools Raw materials.

1. Phillips screwdriver.

mm Allen wrench.

Method. 1. Dial the finger to the 1st position. Use an Allen wrench to loosen the shift line with a Phillips screwdriver clockwise.

Tighten the limit screws, which is the outer piece of the front derailleur and ** flush.

2. Observe the height of the derailleur and platter, 1-3mm.

3. Loosen the L limit screw counterclockwise, so that the derailleur is retracted, and the outer piece is 1-3mm with the chain, (that is, the minimum plate of the tower flying does not rub the derailleur).

4. Set up the speed line, dial to the 2nd gear, rotate the crankset, and observe whether the 2-8 gears are rubbing the chain. If rubbing the outer piece of the derailleur, tighten the trim screws. Otherwise, loosen the fine-tuning screws, and you'll be fine.

Forward dial. Introduction].

The front derailleur is a bicycle shifting system.

It is responsible for the accurate and rapid lifting of the crankset gear. to adapt the cyclist to different road conditions. From the front dial arm movement mode, it can be roughly divided into four categories:

Swing-up front derailleur, pendulum front derailleur, side-swing front derailleur. From the way of wiring the front derailleur, it is roughly divided into pull-up front dillerailleur and pull-down front derailleur.

Mountain bike. The adjustment of the front derailleur mainly adjusts the inner limit (the inner dead center of the drive range) and the outer limit (the outer dead center of the drive range). The specific steps are as follows:

1. First know the limit screw, in the figure below, L represents the inner limit, and H represents the outer limit.

2. Inner limit adjustment: first change the crankset to the smallest tooth, and the flywheel to the maximum tooth, check whether the inner guide plate rubs against the chain, or the gap between the inner guide plate and the chain is large, at this time, you need to adjust the screw marked L on the front dial to keep a distance of 1 to the chain.

3. The following picture shows that the chain touches the leading chain plate, which can be adjusted to the required distance. You can first loosen the front derailleur shift line, adjust the spacing of the front derailleur inner limit according to the inner limit adjustment method, and then tighten the front derailleur speed line.

4. Adjustment of the outer limit: change the front dial to the maximum chainring, change the flywheel to the smallest piece, and then check whether the outer guide plate touches the chain or the spacing is too large, and adjust the screws marked with h for adjustment. Again, keep a distance of 1 to .

5. As shown in the figure below, if the spacing is too large, you only need to adjust the H screw. If the outer chain guide plate is too outward, the chain will fall off outwards and even get stuck between the chain and the crank, so you need to be careful.

6. Note: If the outer chain guide plate of the adjusting H screw still touches the chain, it means that the transmission line is relatively loose and the transmission needs to be adjusted.

on the fine-tuning bolts. Here's the screwdriver.

The one pointed.

To borrow the one going downstairs, first of all, find a flat-head Phillips screwdriver. See the two screws on the front dial of the Himano sis. One is h and one is l. You screw the h-screw. Just adjust to the exact position.

H screw - used to adjust the positioning of the chain at the most ** piece. Counterclockwise (screwed out): The front dial arm is away from the seating tube; Clockwise (precession):

The front dial arm is close to the seatpost. Note: Counterclockwise (unscrewed) to master the scale, too much, will cause the chain to fall off the plate, stuck between the crank and **, very dangerous.

l Screws – used to adjust the positioning of the chain at the smallest platter. Counterclockwise (screwed out): the front dial arm is close to the seating tube; Clockwise (precession):

The front rake arm is away from the seatpost. Note: Counterclockwise (spin out) to master the scale.

If it is too much, it will cause the chain to come off and get stuck between the bottom bracket and the small plate, which is very dangerous.

There is also the ability to adjust the tightness of the front derailleur wire to adjust the sensitivity and position of the front derailleur shift, moving outward when tight, and moving inward when loose.

Sometimes how to adjust the tightness of H screws and L screws and iron wires will have a disc that does not go up or down or scrape the chain, at this time you can loosen the fixing screws of the front drapeur, as pointed in the figure, the position of the front dribple to the direction pointed by the arrow, with the adjustment of H screws and L screws, as well as adjusting the tightness of the steel wire can solve most of the problems.

The adjustment method of mountain bike front derailleur is as follows:

1. If it is a front derailleur that has been installed, first modulate the H l screw to the center, check whether the relative position between the derailleur and the large crankset is accurate, and the spacing and plane positioning are accurate. Note that the front derailleur is positioned in the mid-panel position, and the indicator is selected as 2 gears.

If the front derailleur is installed at the beginning: install the front derailleur on the seatpost, and slightly tighten the ring fixing screws so that it has a certain friction with the seatpost, and can move up and down and turn left and right on the seatpost more freely.

2. Spacing positioning: use the preset alignment block attached to the front derailleur (can also be replaced by a toothbrush) to cushion the front derailleur guide plate, so that the outer guide plate surface and the large crankset plate surface are on the same plane. Move the front derailleur up and down along the seat tube to keep the distance between the outer guide plate and the crankset teeth within the range of 1-3mm.

At this point, tighten the front dillerale ring fixing screw slightly, so that the upper and lower positions of the front derailleur on the seatpost have been determined.

3. Plane positioning: grasp the strength, rotate the front derailleur left and right on the seat tube (be careful not to move the front derailleur up and down), and more accurately make the front derailleur outer guide plate surface and the large crankset plate surface on the same plane, that is, determine the left and right position of the front dupliceur on the seat tube. At this point, tighten the front dial ring fixing screw thoroughly.

At this point, the front derailleur without pulling the wire completes the positioning on the seatpost.

4. Steel wire fixing: pass the steel wire through the position shown by the steel wire fixing screw, and place the inner hexagonal wrench in the screw and prepare to tighten; Clamp the wire head with a wire plier and pull hard, at this time, the preset alignment block of the front dial guide plate may fall, it doesn't matter, continue to grasp the strength and direction to pull hard, and when the front dial outer guide plate surface is on the same plane as the large crankset disc surface, quickly tighten the steel wire fixing screw.

It should be reminded here that when operating this step, the finger in charge of the front dial must be positioned at 2 (that is, positioned in the middle disk). Front dial 3 disc (maximum), rear dial 8 disc (minimum), adjust H screw to ensure no friction; Front dial 1 disc (minimum), rear dial 1 disc (maximum), adjust L screws to ensure no friction.

21-speed MTB front derailleur adjustment:

1. There are two limit screws on the front dribple, which are not marked with "H" and "L". The screws marked with an "H" are the ones that limit the left and right position of the chain on the largest crankset. Rotate clockwise to bring the chain closer to the small crankset on the inside of the large crankset; Rotate the chain counterclockwise to bring the chain closer to the outside of the large crankset (too much counterclockwise rotation will cause the chain to drop).

The screws marked with an "L" are the ones that limit the left and right position of the chain on the smallest crankset.

Rotate clockwise to bring the chain closer to the larger chainset on the inside of the small chainring; Rotate the chain counterclockwise to bring the chain closer to the outside of the crankset (turning the "L" screw too much counterclockwise will also cause the chain to drop). Adjust the "H" and "L" limit screws to keep the front derailleur and the chain at a gap of about 3 mm.

2. Control the finger dial of the front derailleur, and the position connected to the transmission line is the transmission line fine-tuning screw, which is used to control the tightness of the transmission line. Rotate the trimmer screw clockwise to loosen the shiftline (the chain moves closer to the smaller crankset), and rotate the trimmer screw counterclockwise to tighten the shiftline (the chain moves closer to the larger crankset).

There are two screws on the front derailleur, H is adjusted on the large crankset, L is adjusted on the small crankset, and it is useless to adjust on the middle crankset.

1. First of all, prepare tools and screwdrivers.

and wrenches. <>

2. Then use an Allen wrench.

Loosen the shift line and have a Phillips screwdriver clockwise.

Tighten the screws in the position so that the outer piece of the front derailleur is flush with **.

3. Next, carefully observe the height of the derailleur and the platter, which is generally about 1-3 mm with the finch key.

4. Counterclockwise rotation is to loosen the limit screw, so that the derailleur is retracted, the outer piece and the chain are about 1-3 millimeters old, and the smallest disc on the inner side is not rubbed against the derailleur is the best.

5. Then install the gear line at the position of the handlebar, dial to the 2nd gear, rotate the crankset, and observe whether the 2-8 gears may rub the chain. If Lu Qiaoguo rubs the outer piece of the chain derailleur, tighten the fine-tuning screws, and slowly loosen the adjustment screws. When tightening the trim screws, you should dial it to the first gear before operating.

When you buy it, the guy at the store will put it on for you、、、 if you buy it online, you go to the place where you bought the bike and ask someone to put it on for you.

How to install the front derailleur for mountain bikes:

1. Open the mounting fastening screws of the front derailleur, and the installation seat is open.

2. Put the front derailleur into the seatpost and close the mount, and gently tighten the mounting screws by hand.

3. Adjust the paddle of the front derailleur and keep it parallel to the tooth of the crankset.

4. Make sure that the clamp block (a long plastic block) at the initial position of the front derailleur is in the corresponding position of the front dillerail, and then adjust the upper and lower positions of the front derailleur on the riser, so that the installation line on the front derailleur sticker is about 1 2 mm away from the top of the most ** piece of the crankset, and the front derailleur can be locked with a wrench to fasten the screw.

5. Twist the dial trim screw clockwise to the end, then exit the circle, and adjust the dial to the gear (3 gear) of the maximum crankset. Install the transmission cable in place along the frame, and finally connect the transmission cable to the transmission cable locking screw on the front derailleur and gently tighten the transmission cable and then lock it.

6. Take out the initial position clamp block (plastic block) of the front derailleur and make a slight adjustment to the position of the front derailleur before you can ride on the road.