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Shimano brake Ultegra R8100 front CS51 18/27mm lockring (R55C4)

81.99 
RRP 96.99 
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From 27.01.2026 (Tuesday) Check availability
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Delivery method on Wednesday 28.01.2026
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Delivery method on Wednesday 28.01.2026
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Ultegra R8100 brake calipers offer an exceptional balance of stiffness, weight and stopping power. Maximum tire width: 28C.
Technologies used: SLR-EV

  • Type: ROAD
  • Total package weight: 332g, Front, black
  • SLR - SHIMANO Linear Response, CS51, 18mm nut
  • Brake pads: R55C4
  • Material: Aluminum / Steel

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Product details
Location Front
product ID 147842
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WARNING
For assistance with installation, adjustment, and replacement of products not found in the user's manual, please consult the place of purchase or a distributor. A dealer's manual intended 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 handling characteristics) and operation of your bicycle. Improper use of the bicycle's brake system may result in a loss of control or fall, which could lead to serious injury.
- Do not disassemble or modify the product. This may cause the product to not operate correctly, and you may fall unexpectedly and be seriously injured.
- Do not apply the front brake too strongly. If you do, the front wheel may lock and the bicycle may fall 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 collide and be seriously injured.
- A wet road surface can cause tires to lose traction. To avoid this, reduce your speed and apply the brakes well in advance and gently. If the tires do happen to lose traction, you may fall and be seriously injured.
- Do not allow any oil or grease to get onto the brake shoes. If the bicycle is ridden with oil or grease on the brake shoes, the brakes may not work correctly, and serious injury could result from a fall or collision.
- Do not use the brake cable if it is rusty, frayed, or cracked. Otherwise, the brakes may not function correctly.

Japanese manufacturer produces road, mountain, gravel, trekking, BMX and e-bike groupsets. They also offer a whole series of components and apparel. Their range goes from wheels, footwear, eyewear to backpacks. Shimano is a traditional manufacturer known for their quality work, which is why they are the favourite choice of amateurs and professionals.

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