Chain keeper

Parametric chain keeper design, for use with 1x drivetrains.

Customize to your liking.

I haven't tested the parameter space.

Untested/never printed.

Designed for two M4 x 20 socket head cap bolts & two M4 locknuts (7 mm width by 5 mm height).

Print both halves after adjusting the file for your frame.

The STLs are for my frame, a Fuji Jari, with the following geometry:
- BBDrop: 69 mm
- ChainStayLength: 435 mm
- SeatTubeAngle: 74.5 deg
- SeatTubeDia: 34.9 mm
- 42T ring

Sample Bike.sldasm provided for seeing it in context. The chainring is 43T in this example. The DiaTotoothRatio is found by 178 mm/43 teeth. The chainline is adjusted to my chainline of 50 mm.

Parts for the assembly (crankset & frame) are found in the Reference folder, which I hope are successfully uploaded.

Credit goes to Plamen Cherkezov for creating the frame model & Morar Adrian for the SR Apex crankset model, over on GrabCAD.