Shimano GRX ST-RX820 shifting/hydr. brake, 2x12, right

WARNING
For installation, adjustment and replacement information on products not found in the user's manual, consult the place of purchase or a distributor. A dealer's manual for professional and experienced bicycle mechanics is available on our website (https://si.shimano.com).
For safety, be sure to read this "user's manual" thoroughly before use, follow it for correct use, and save it so that you can refer back to it at any time.
The following instructions should always be followed in order to prevent personal injury, physical damage to equipment and the surrounding area. The instructions are classified according to the degree of danger or damage that may occur if the product is used incorrectly.
DANGER - Failure to follow the instructions will result in death or serious injury.
WARNING - Failure to follow the instructions could result in death or serious injury.
CAUTION - Failure to follow the instructions could result in personal injury or physical damage to equipment and the surrounding area.

WARNING
- Because each bicycle may handle slightly differently depending on the model, learn the proper braking technique (including pressure on the brake lever and bicycle control characteristics) and operation of your bicycle. Improper use of your bicycle's brake system may result in a loss of control, which could lead to a serious injury due to a fall or collision.
- Do not disassemble or modify the product. This may cause the product to not operate correctly, and you may unexpectedly fall and be seriously injured.
- This hydraulic brake system has different braking characteristics than rim brake type brake characteristics, pointing to a relatively large braking force at the start of braking (higher than with the rim brake type); before use, become sufficiently familiar with the braking characteristics. If you ride your bicycle without becoming thoroughly familiar with the braking characteristics, braking may result in a fall from the bicycle, possibly resulting in serious injury or a fatal accident.
- The braking force of the hydraulic brake system will increase along with the size of the disc brake rotor (140 mm, 160 mm, 180 mm, 203 mm).
- Do not use a 203 mm disc brake rotor. This will excessively increase the braking force, which may cause you to lose control of the bicycle, fall, and be seriously injured.
- Use a 180 mm disc brake rotor only if you cannot obtain sufficient braking force with a 160 mm disc brake rotor during a test ride, such as when riding a road e-bike or if the rider is heavy. Otherwise, you may lose control of the bicycle, fall, and be seriously injured.
- If you feel the braking force is too strong or too weak, stop using it and consult the place of purchase or a distributor. Accidents or falls may occur due to loss of control of the bicycle, which may result in serious injury.
- Keep your fingers away from the rotating disc brake rotors. The disc brake rotor is sharp enough to cause serious injury to your fingers if your fingers get caught in the openings of a moving rotor.
- Do not touch the calipers or disc brake rotor during or immediately after riding the bicycle. The calipers and disc brake rotor become hot during braking, so you may be burned if you touch them.
- Do not allow any oil or grease to get onto the disc brake rotor and brake pads. Riding the bicycle with oil or grease on the disc brake rotor and brake pads may cause the brakes to not function, leading to serious injury due to a fall or collision.
- Check the brake pad thickness and do not use them if they are 0.5 mm or less in thickness. Otherwise, this may cause the brakes to not function, leading to serious injury due to a fall or collision.
- Do not use the disc brake rotor if it is cracked or deformed. The disc brake rotor may break, leading to serious injury due to a fall.
- Do not use the disc brake rotor if its thickness is 1.5 mm or less. Also, do not use it if the aluminum surface is visible. The disc brake rotor may break, leading to serious injury due to a fall.
- Do not apply the brakes continuously. This may cause a sudden increase in brake lever stroke, cause the brakes to not function, and lead to serious injury due to a fall or collision.
- Do not use the brakes if there is fluid leakage. This may cause the brakes to not function, leading to serious injury due to a fall or collision.
- Do not apply the front brake too strongly. Doing so may cause the front wheel to lock and the bicycle to tip forward, causing serious injury.
- Because the required braking distance will be longer during wet weather, reduce your speed. Apply the brakes well in advance and gently. You may fall or crash and be seriously injured.
- A wet road surface can cause the tires to lose traction. To prevent this, reduce your speed and apply the brakes well in advance and gently. If the tires lose traction, you may fall and be seriously injured.

CAUTION
- Cautions regarding SHIMANO genuine mineral oil
- If it gets in your eyes, flush your eyes with clean water and seek immediate medical attention. Contact with the eyes may cause irritation.
- If it gets on your skin, wash it thoroughly with soap and water. Contact with the skin may cause rashes and discomfort.
- Protect your nose and mouth with a protective breathing mask and use in a well-ventilated room. Inhaling mineral oil vapor or fumes may cause nausea.
- If you inhale mineral oil vapor or fumes, immediately move to a place where there is fresh air. Cover yourself with a blanket. Stay warm in a stable position and seek professional medical attention.
- Warm-up period
-Disc brakes have a certain warm-up period, and the braking force gradually increases along with the increasing warm-up period. Accidents or falls may occur due to loss of control of the bicycle, which may result in serious injury. The same situation occurs when replacing brake pads or the disc brake rotor.