Facebook Twitter LinkedIn Pinterest Bluesky Threads What are these holes for? by BigSlav667 Bicycling Bike Bike Repair Biking Cycling Repair
EmperorsChamberMaid_ on September 27, 2025 9:52 pm Mudguard and pannier rack mounts. You can have both.
Virtual_Club8510 on September 27, 2025 11:03 pm Those are for [disc brake adapters](https://images.performancebike.com/cdn-cgi/image/f=auto,width=950/images/large/bikes/shimano/ismmar180psa.jpg) but can be used for racks/mudguards.
6 Comments
Mudguard mounts or rack mounts.
Most likely a rack.
For attachments like fenders and racks
That’s where I carry you.
Mudguard and pannier rack mounts. You can have both.
Those are for [disc brake adapters](https://images.performancebike.com/cdn-cgi/image/f=auto,width=950/images/large/bikes/shimano/ismmar180psa.jpg) but can be used for racks/mudguards.