FR Inline Brake for 3 or 4 Wheels

FR BRAKE 1  for 4 wheels Frames for skates equipped with X3R frames (FRX 80, FR3 80, and NEO2 80) 72-90mm compatible with: 4x72mm, 4x76mm, 4x80mm, 4x84mm, 4x90mm frames

FR Brake 2 Rockerable for 4-wheel frames  is a brake specifically designed for 4-wheel rockerable X3R frames. It provides safe and effective stopping power without compromising agility. This model is highly recommended for skates such as the FR SKATES FRX 80, FR3 80, and NEO2 80, and is also compatible with all 4-wheel frames ranging from 219 mm to 273 mm – suitable for setups from 4x72 mm to 4x90 mm, whether flat or rockerable.72-84mm compatible with: 4x72mm, 4x76mm, 4x80mm, 4x84mm frames

FR Brake 3: for 3-Wheel Frames Compatible with FR1 310, FR1 325, FR2 310, FR3 310, and FRX 310 skates.