Shimano Flat-Mount Road Disc Caliper Fixing Bolt (Y8N208030) – For 30mm Thick Chainstay

This here’s a genuine Shimano part — the flat-mount disc caliper fixing bolt, model number Y8N208030.

It’s designed for road bikes with a 30mm thick chainstay.

If you’re building up a frame or swapping calipers, this is the bolt you need to mount that caliper solid.

It’s brand new, still in the package.

Small part, but it’s a genuine Shimano piece, so you know it fits right and holds up.

Don’t rig it with random hardware — grab the right bolt.