Shimano BR-RS305 Flat Mount Mechanical Calliper

Shimano BR-RS305 Flat Mount Mechanical Calliper

• Flat mount mechanical disc brake calliper for modern road and gravel bikes.

• Cable-actuated braking - no hydraulic fluid required.

• Compatible with 140mm and 160mm rotors (see fitment details below).

• Increased pad-to-rotor clearance reduces unwanted brake rub.

• Adjustable pad clearance for quick, precise setup.

• Forged one-piece alloy construction for strength and low weight.

• Low-profile body for clean integration and improved aerodynamics

• Shim-less mounting system for fast installation and easy alignment.

The Shimano BR-RS305 flat mount mechanical disc brake calliper delivers reliable road, gravel and cyclocross braking performance without the complexity of hydraulic systems. Designed for riders who prefer cable-actuated disc brakes, the RS305 offers smooth modulation, simple maintenance, and clean integration with Shimano's Flat Mount standard.

Ideal for endurance road bikes, winter training builds and cyclocross setups, this lightweight mechanical disc brake provides dependable stopping power with minimal fuss.

Rotor Compatibility:

• Front calliper: Compatible with 140mm or 160mm rotors using included flip-flop adapter.

• Rear calliper: Designed for 140mm rotor (160mm compatible with separate rear adapter).

Technical Specifications:

• Position: Front (BR-RS305-F) or Rear (BR-RS305-R)

• Brake type: Mechanical (cable-operated) disc brake

• Mount type: Flat mount

• Compatible rotor sizes:

Front: 140mm / 160mm

Rear: 140mm (160mm with separate adapter)

Recommended Shimano Disc Rotors:

• SM-RT54 / SM-RT56 (160mm)

• SM-RT70 (140mm / 160mm)

• *Brake calliper only. Disc rotor sold separately.