Gears and transmission
Derailleur Extra Pulley Attachment
- Bounding box
- 40 × 60 × 101 mm
- Engine
- 3D Printing B-rep
- Parameters
- 13
- Published
- November 10, 2026
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The prompt
Normal bicycle rear derailleurs have 2 pulleys. Please design an extra pulley attachment that can be bolted to the lower pulley on an existing derailleur.
Parameters
| Name | Value | Range |
|---|---|---|
| Side plate thickness | 4 mm | 2 – 8 |
| Inside width for pulley | 9 mm | 6 – 20 |
| Extra pulley centre distance | 45 mm | 30 – 80 |
| Lower pulley bolt hole | 5.5 mm | 4.5 – 8 |
| Extra pulley axle hole | 5.5 mm | 4.5 – 8 |
| Chain clearance around pulleys | 8 mm | 5 – 15 |
| Rear web thickness | 4 mm | 2 – 8 |
| Extra pulley outer diameter | 40 mm | 25 – 70 |
| Extra pulley width | 8 mm | 5 – 15 |
| Extra pulley bore | 5.3 mm | 3.2 – 8 |
| Number of teeth | 12 mm | 8 – 20 |
| Tooth depth | 2 mm | 0.6 – 5 |
| Tooth width at pitch circle | 4 mm | 2 – 10 |
Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.
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