Shimano Dura-Ace BR-R9170 Brake Caliper Fixing Bolt

This specific bolt is designed for the BR-R9170 hydraulic disc brake caliper. While it may physically fit other models, it is engineered specifically for the R9170 system's tolerances and should not be used as a substitute for other brake models.

The length of the bolt is critical because it must engage enough threads in the caliper body to be secure without bottoming out or damaging the frame. This 25mm version is specifically intended for frames with thicker chainstays where a standard-length bolt would be too short.

Shimano bolts often come with a pre-applied thread locker. If yours does not, or if you are reinstalling a bolt, it is good practice to apply a small amount of medium-strength thread locker to ensure it remains secure under the vibrations of riding.

Check your current bolt length or consult your bicycle frame's technical manual. If you are installing a new caliper and the bolt does not thread deeply enough into the caliper body, or if it feels loose, you likely need a different length to accommodate your specific frame geometry.

Yes, this is an original equipment manufacturer (OEM) replacement part. Using genuine Shimano hardware ensures the correct metallurgy and thread pitch, which is essential for the safety and structural integrity of your braking system.