These handy adaptors let you use different sized rotors on your frame or fork, so you can customize your stopping power. Specifically designed for a 74mm caliper on a flat mount road fork, these adaptors work with 140mm rotors to deliver reliable braking performance. And, with included mounting hardware, you can install them in a snap. Whether you’re a casual rider or a serious cyclist, Shimano Disc Brake Adaptors are a great addition to your bike, giving you more control and confidence on any ride.