Shimano Dura-Ace disc brakes represent a whole new level of brake control and braking reliability in the road bike segment. The brake allows maximum confidence in braking performance even in harsh weather conditions.

Di2 ST-R9170 2speed front brake with handle bar
Handle diameter: 23.8mm/24.2mm
Double-sided steering (STI)
Front: 2-speed
Optical display: no
Purpose: Road, Triathlon, Cyclocross
Brake caliper: BR-R9170
Brake type: hydraulic, 2-piston
Fluid type: mineral oil
Cable: SM-BH90-JK-SSR
Pads: L02A resin with heat sink (also compatible: K02Ti Resin, K04Ti Metal, L04C Metal)
Mounting: Flat Mount (for 4mm steel screws).
Technologies: One-Way, Ice-Tech
Ceramic pistons
Easy installation and maintenance
Good heat dissipation
Recommended brake discs: rear 140mm (160mm with adapter)
Compatibility: EW-SD50
Software update via E-tube port: Yes
E-Tube port (pcs): 2

Material
Handle: Carbon
Clamp: Aluminum
Weight: Approximately 320g

Scope of delivery
1 ST-R9170 left 2speed handlebar
1 Dura Ace BR-R9170 disc brake caliper with cable
1 flat adapter 140mm / 160mm
1 L02A resin pads with heat sink
1 SM-BH90-JK-SSR 1000mm cable
2 Clamp screws
1 Oil+Bolt set
The brake is primed and bled with the factory length of cable