Official B-RAIL Mounting Rail + Accessory List

NEW: Following popular requests, I’ve added a .STEP base part that you can use to create your own accessories!

If you design and share an addon, let me know — I’ll be happy to feature it on the Community Addon page!

UPDATE : We’ve released an optimized version (v2) of the standard rail that makes sliding accessories a bit smoother. Be sure to check out the updated print profile!

This is the official mounting rail for the B-RAIL System, designed to fit any standard bottle cage mounts on your bike. It allows you to attach a wide range of accessories and swap them out in seconds. The integrated rear latch makes clipping accessories on and off quick and effortless. With the B-RAIL System, you can customize your bike setup in just seconds.

Note: If the rail doesn’t fit perfectly on your bike, please check the section titled “Other Rails and Adaptors”—there are many options available that may suit your setup better.  Also, if your screws have heads higher than 5 mm, I recommend using the Offset Rail, which provides additional clearance for larger screw heads.

Here’s what you can mount on the rail today: 

Boxes:

• NEW Horizontal Container – Gen2
• Small Vertical Container
• Vertical Container
• Small Horizontal Bike Container
• Large Horizontal Bike Container
• Horizontal Container For Phone
• Tall Container + Airtag/SmartTag 2
• Sliding Bike Case
• Sliding Bike Case with Phone Mount
• Seatpost Storage Box for Garmin Varia

Bottle Holders: 

• Bottle holder
• NEW Side-Entry Bottle Holder with 7 available sizes! 
• Bottle Holder With Small Compartment
• Nalgene Bottle Holder
• Slim Bottle Holder
• Double Bottle Holder

Other Cargo Accessories:

• U-Lock Holder
• Fork Light Mount
• Minimal Strap Mount 
• XL Fork Bag Mount
• GoPro Mounting Point
• GoPro Mounting Point (Fork Version)
• Front Pannier Racks 
• Milk crate
• Milk Crate (Top Tube version)
• Rear Pannier

For Kids: 

• Kids’ Bike Doll Seat
• Kids’ Bike Rear Basket

Other Rails and Adaptors :

• Offset Rail
• No-Screw Rail 
• XL Standard Rail
• XL Offset Rail
• XL No-Screw Rail
• XL Rail - 150 mm version
• Rail with AirTag/SmartTag 2
• Rail with Pump Holder
• Seatpost rail
• Single/Double Mounting Point Adaptor (now with M5 nuts option!)

Browse the community-made B-Rail accessories, mods, and remixes:

• B-Rail Community Addons

Many other innovations to come - subscribe to see what is coming!

Please share your ideas or suggestions in the comments — and I’ll possibly make them for you. 

I hope you enjoy the B-RAIL System!