Shimano GRX Crankset Dust Cap with Hidden AirTag / Novoo Holder

It serves a dual purpose: it acts as a dust and dirt plug to keep the hollow spindle clean, while discreetly housing

an Apple AirTag or Novoo tracker inside for hidden bicycle tracking.

The two-piece design secures safely inside the crankset spindle and expands into place. No extra hardware

required — the expansion screw is included as a 3D printable STL file!

Tools Required:

• 6mm Allen key for installation

Print Settings:

• Material: PETG or ABS/ASA (Recommended for outdoor UV & weather resistance)

• Layer Height: 0.20 mm

• Infill: 15%

• Walls/Perimeters: 3 or 4 (essential for the screw thread and expansion mechanical strength)

• Supports: Yes (depending on orientation)