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Shimano Dura Ace Di2 ST-R9170 + BR-R9170 Disc Brake & Shifter/Lever Set



Shimano Dura-Ace Di2 ST-R9170 + BR-R9170 Hydraulic Disc Brakes & Dual Control Shifter / Lever STi Set 11 Speed Electronic. A completely new level of reliability and braking performance is achieved with Dura Ace disc brakes. Even under challenging weather conditions, the rider can set maximum trust in braking performance. Thanks to the flat mount construction, the BR-R9170 hydraulic disc brake caliper is mounted direct to the frame, giving it a flat profile and higher efficiency. The heat dissipation is greatly improved and this gives the rider stable braking performance throughout the entire ride. Pre-bled Caliper, Brake lever, and Pre-Bled hose.

Application: Road, Cyclocross
Brake Type: disc brake, hydraulic
Mount: flat mount
Hydraulic Fluid: Shimano mineral oil
Hose Length: 1000 mm (front) / 1700 mm (rear)

Technical Inforamtion
Shift Lever Material: GFRP
Brake Lever Material: aluminium, painted
Body Material: aluminium, painted
Main Cylinder Material: aluminium
Gearing: Front: 2-speed, Rear:11-speed  Di2
Type: dual control (STI)
Brake Lever: hydraulic
Compatible Derailleur: road 11-speed
Handlebar Diameter: 23.8 “ 24.2 mm
Reach Adjust: yes (tools required)
Contact Point Adjust: yes
Brake Hose: SM-BH90-JK-SS
Hose Connection: straight

Shimano Item # UPC
Front: IR9170DLF4SA10A 689228892057
Rear: IR9170DRRDSA17 689228892095

Technical Information - Caliper:
Material: aluminium, painted, steel bolts (4 mm)
Construction: 2-piece
Brake Pistons: 2 pistons (ceramic)
Brake Pads: L02A resin Ice Tech with cooling fins
Recommended Rotor: SM-RT900 (front 140/160mm includes adapter front only) (Rear 160mm)
One Way Bleeding: yes
Technology: Ice-Tech
rotor not included

Servo Wave
When you pull a servo wave brake lever initial pad travel is fast, so little lever movement is needed to bring the pads into contact with the rotor. The power multiplication factor then increases rapidly at the pad-to-rim contact so more of the lever stroke is used to apply greater braking power with improved control.

One Way Bleeding
One way bleeding was developed for quick and easy prevention of air in Shimanos hydraulic system. Shimano has streamlined the oil route throughout the system to prevent air bubbles from being captured in the system. One way oil routing plus a funnel tool with mineral oil provides an easy and clean bleeding system.

The fade, which can occur to rotor and pad when braking on a long downhill ride for instance, has a negative impact on the braking performance. Shimano has adopted Ice Technology rotors and Ice Technology pads to realize the cooling technology for consistent performance. The rotor blade, which has a 3 layer-sandwich structure of stainless steel, aluminium and stainless steel, provides better radiation performance achieving from 400 °C to 300°C surface temperature. Also, the radiation fin has been adopted for the pad. Moreover, the rotor blade and the radiator fin provide long pad life, less noise, less fade and are lightweight.
XTR, Saint, Deore XT, SLX, Zee, Deore LX calipers are bundled with Ice Technology pistons in order to achieve optimized lightweight, high rigidity and heat dissipation. Oversized pistons transfer hydraulic power directly to the brake pad, and ceramic material is used to avoid heat transfer for constant stable braking, providing efficient stopping power transfer without loss.

Original Shimano parts guarantees that all components work perfectly for optimum performance and maximum safety and longevity.

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