Parametric MTB (and any bike) Chain guide
Print Profile(1)
Bill of Materials
- bearings 696-2RS x 2: sets can be found on amazon or aliexpress for relatively cheap
Description
Parametric Kids MTB Chain Guide
I designed this chain guide for my kid’s mountain bike after constantly dealing with dropped chains. I tried several commercial solutions first, but none worked reliably, so I decided to design my own guide that mounts behind the rear wheel.
The guide keeps the chain aligned with the drivetrain and helps prevent the chain from jumping off, even after small jumps and rough riding. The integrated bearings allow the chain to glide smoothly while also reducing wear on the printed part.
The design is fully parametric, so you can easily adapt it to your own bike. You can adjust:
- The overall length of the guide
- The diameter of the mounting rod/tube
- The spread/opening width of the clamp section
Hardware / BOM
Very simple hardware:
- 2× 696-2RS bearings (or similar size)
- 1× M6×30 bolt
- 1× M6 nyloc nut
- 2× washers
- 1× zip tie
Installation and adjustment are quick and straightforward.
Printing Recommendations
I printed mine in PC-CF, but ASA, PETG-CF, or regular PETG should also work well.
I would avoid very brittle materials.
I chose to print the part flat on the bed with additional supports. In my case, this seemed to provide the best longitudinal strength for the guide. However, feel free to experiment with different print orientations depending on your printer, material, and riding style.
The part shown in the photos has been working great on a kid’s MTB and completely solved the chain dropping issue.
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, publishing derivative works outside the Makerworld platform or 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. Subject to the above restrictions, derivative works may be published only within the Makerworld platform, and all such derivative works must be licensed under the same SDFL‑C license, without modification or additional terms. You may download the digital versions of this object, 3D print it, and display images, videos, or usage demonstrations of 3D printed versions of the object on personal social media platforms or Makerworld official channels, provided that no digital versions of the object are shared or distributed.
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