Shimano Ultegra BR-R8170 Hydraulic Disc Brake Caliper

$67.00 USD $97.00 USD

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The Shimano Ultegra BR-R8170 is a lightweight flat-mount hydraulic disc brake caliper that delivers quiet operation, precise modulation and confident stopping power, making it a worthwhile road bike brake upgrade for racing, endurance riding and steep local descents.

Shimano Ultegra BR-R8170 Features

Ten per cent wider pad clearance helps reduce rotor rub and braking noise
Refined modulation provides smoother control and a quicker initial braking response
ICE TECHNOLOGIES pad compatibility supports consistent performance on long descents
ONE WAY BLEEDING simplifies hydraulic brake servicing and removal of trapped air
Lightweight two-piston flat-mount design suits modern performance road bikes

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SKU: BR-R8170-F
Barcode: 4550170889517

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Series: Shimano Ultegra R8100

Brake type: Hydraulic disc brake

Mounting standard: Flat mount

Brake position:

Separate front and rear versions available

Number of pistons: Two

Piston material: Resin

Caliper material: Aluminium

Caliper finish: Painted Ultegra series colour

Hydraulic fluid: Shimano mineral oil

Recommended brake lever: Shimano Ultegra ST-R8170

Compatible brake hose: Shimano SM-BH90-JK-SSR

Brake hose connection: Straight

Standard brake pad compatibility:

Shimano K05S-RX resin pads without cooling fins
Shimano L05A-RF resin pads with cooling fins

Optional brake pad compatibility:

Shimano L04C-MF metal pads with cooling fins

Recommended disc brake rotors:

Shimano RT-CL800
Shimano RT-MT800

Brake pad retention: Pad axle

Caliper fixing tool: 4mm hex key

Anti-loosening system: Fixing pin and snap ring

Rear mounting-bolt options:

10mm
15mm
20mm
25mm
30mm
35mm

Manufacturer-listed average weight: Approximately 123g

The Shimano Ultegra BR-R8170 uses a compact aluminium caliper body engineered to balance low weight, structural stiffness and reliable hydraulic braking performance. Its flat-mount profile integrates neatly with modern road frames and forks, creating the clean appearance expected from a premium road bike groupset.

Two resin pistons apply controlled pressure to the brake pads while helping limit heat transfer from the braking surface into the hydraulic system. This assists in maintaining a predictable lever feel during repeated high-speed braking and extended descents.

Shimano increased the clearance between the brake pads and rotor by ten per cent compared with the previous Ultegra generation. The additional space reduces the likelihood of light rotor contact caused by wheel flex, heat-related rotor movement or small setup variations. This makes the system quieter and less sensitive to minor alignment changes.

The caliper is compatible with Shimano ICE TECHNOLOGIES brake pads. Finned brake pad options help transfer heat away from the braking surface, reducing temperature build-up during sustained braking. When paired with Shimano’s recommended RT-CL800 or RT-MT800 rotors, the complete system is designed to improve braking consistency, reduce noise and limit brake fade.

ONE WAY BLEEDING uses a streamlined internal oil path to discourage air pockets from becoming trapped inside the hydraulic circuit. This makes routine road bike brake servicing more efficient and helps qualified mechanics achieve a firm, consistent lever feel.

Available configurations:

Front flat-mount brake caliper
Rear flat-mount brake caliper

Typical rotor compatibility:

140mm road disc brake rotor
160mm road disc brake rotor

The correct rotor diameter depends on the frame, fork, mounting adapter and bicycle manufacturer’s specifications.

Front installation:

The front caliper may require a flat-mount adapter according to the fork design and selected rotor diameter. Retail front configurations are commonly supplied for use with a 160mm rotor, but package contents should be checked before installation.

Rear installation:

Rear fitment depends on the frame’s flat-mount thickness and the corresponding fixing-bolt length. Shimano supports several mounting-bolt lengths, ranging from 10mm to 35mm, to accommodate different frame designs.

Brake hose fitment:

The Shimano Ultegra BR-R8170 is designed for the Shimano SM-BH90-JK-SSR hydraulic brake hose with a straight connection at the caliper.

The Shimano Ultegra BR-R8170 is best suited to performance road cyclists, racers, endurance riders and enthusiastic recreational cyclists upgrading a modern flat-mount road bike.

Road cycling forum discussions have focused positively on the additional pad clearance offered by the Shimano Ultegra BR-R8170. Riders upgrading from previous Shimano road calipers frequently identify the reduced likelihood of intermittent rotor rub as the most noticeable everyday improvement.

Product Care & Warranty Information

Keep brake pads and rotors free from chain lubricant, grease, silicone spray and bicycle polish
Clean the disc rotor using isopropyl alcohol or residue-free bicycle disc brake cleaner
Never touch the rotor braking surface with oily or contaminated hands
Do not operate the brake lever while the wheel is removed unless a pad spacer is installed
Inspect brake pad thickness regularly and replace pads before reaching Shimano’s wear limit
Check pads for glazing, uneven wear or contamination
Inspect the caliper and hose connections for hydraulic fluid leakage
Use Shimano mineral oil only
Never introduce DOT brake fluid into the system
Follow Shimano procedures when bleeding, shortening or replacing the brake hose
Use a torque wrench when installing the caliper, adapter and associated hardware
Bed in new pads and rotors progressively before commencing steep or high-speed riding
Have the braking system inspected by a qualified bicycle mechanic if lever travel increases or braking power declines

Shimano Ultegra components purchased new in Australia are generally covered by Shimano Australia’s two-year limited warranty against qualifying defects in materials and workmanship.

Product SKU

Front: BR-R8170-F
Rear: BR-R8170-R

Barcode (GTIN/EAN)

Front: 4550170889517
Rear: 4550170889531

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