In this article you can find instructions for installing or replacing single-speed sprockets and belt-drive sprockets on Classified Powershift Hubs. It includes torque specifications, spacer arrangements, and tips for proper belt alignment.
1. Torque specifications
Belt or single-speed sprocket lock ring:
Minimum: 30 Nm
Maximum: 40 Nm
Hubshell lock ring:
Minimum: 30 Nm
Maximum: 40 Nm
2. Belt and single-speed sprocket spacer installation
For Powershift Hubs with a single sprocket, all spacers delivered must be installed on either side of the sprocket to ensure proper belt or chain alignment.
If you know the belt or chain line of your frame, you can check the table below to determine how to divide the spacers over the left and right side of the the sprocket. If you don't know the belt or chain line, you can equally distribute the spacers on the left and right side of the sprocket and follow the belt or chain alignment procedure explained in step 3 below.
142 mm belt line:
| Belt Line (mm) | Interior Spacer (mm) | Exterior Spacer (mm) | Maximum Rear Sprocket | Spacers to Install |
|---|---|---|---|---|
| 53.2 | 1.5 | 4.5 | 34T | Interior 1.5, Exterior 4 |
| 53.7 | 2-1.5-1 | 2 | 34T | 1-1.5 |
| 54.2 | 2.5 | 3.5 | 34T | 1.5-1.5-1 |
| 54.7 | 3 | 3 | 34T | 1.5-1.5 |
| 55.2 | 3.5 | 2.5 | 34T | 1-2 |
| 55.7 | 4 | 2 | 34T | 1-1.5-1.5 |
| 56.2 | 4.5 | 1.5 | 34T | 1-1.5-2 |
148 mm Belt Line:
| Belt Line (mm) | Interior Spacer (mm) | Exterior Spacer (mm) | Maximum Rear Sprocket | Spacers to Install |
|---|---|---|---|---|
| 56.2 | 1.5 | 4.5 | 34T | 1.5, 2 |
| 56.7 | 2-1.5-1 | 2 | 34T | 1-1.5 |
| 57.2 | 2.5 | 3.5 | 34T | 1.5-1.5-1 |
| 57.7 | 3 | 3 | 34T | 1.5-1.5 |
| 58.2 | 3.5 | 2.5 | 34T | 1-2 |
| 58.7 | 4 | 2 | 34T | 1-1.5-1.5 |
| 59.2 | 4.5 | 1.5 | 34T | 1-1.5.-2 |
Tip: If the belt line is unknown, start with spacers evenly distributed left and right, similar to belt line 54.7 mm (142 mm hub) or 57.7 mm (148 mm hub).
3. Belt or chain alignment Procedure
Turn the pedals 10–15 rotations to check the belt or chain alignment.
The belt or chain is correctly aligned when it runs straight without noise.
If misaligned, move spacers from one side of the cog to the other.
Repeat rotations until the belt or chain runs silently.
Belt Tension: Contact the bicycle or belt manufacturer for guidance.
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