Seatpost Rail – B-RAIL System
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Bill of Materials
Description
Big Update : V1.2
- Modified rail geometry to ensure a tighter fit
- Added an extended version of the rail, offset by 8 mm from the post to help clear collars or other bike frame constraints
- Added a 22 mm diameter version
- Added 12 new seatpost profiles (for aero bikes and others)
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Hello! 👋 This adapter lets you mount a B-RAIL to your seatpost — or to any other round tube on your bike.
As part of the B-RAIL System, it allows you to quickly swap accessories, making it easy to adapt your setup for any ride.
It’s available in six diameters and seatpost profiles (check dimension in the images):
- NEW 22.0 mm (7/8")
- 25.4 mm (1")
- 27.2 mm (1.07")
- 30.9 mm (1.22")
- 31.6 mm (1-1/4")
- 34.9 mm (1-3/8")
- NEW BMC Kalus
- NEW BMC Roadmachine 2
- NEW BMC Roadmachine 4
- NEW Cannondale Super6 EVO
- NEW Canyon Aeroad CFR
- NEW Canyon Aeroad CF
- NEW Canyon Ultimate CF SL
- NEW Scott Syncros Duncan
- NEW Trek Domane
- NEW Trek Madone SL Gen 6
- NEW Trek Madone SLR7
- NEW Ninebot
If you need another size, just let me know!
Mounting hardware:
You’ll need two M4×14 mm screws (AA176) and two M4 nuts (AB028).
For a complete list of compatible accessories, visit the Official B-RAIL Mounting Rail page.
Enjoy your new B-RAIL setup! 🚴
P.S. We’re always improving the B-RAIL ecosystem — if you have ideas or suggestions for new accessories, share them in the comments!
Membership
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License
You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.
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