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eBay£7.84Visit shop Shimano Cues Jockey Wheels Pulley Set RD-U4020/ U3020 Genuine Replacement
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The Shimano CUES Tension and Guide Pulley Set (MPN: Y3JK98010) is designed for cyclists performing drivetrain maintenance on RD-U4020 and RD-U3020 rear derailleurs. It offers the primary benefit of restored, crisp shifting performance by replacing worn-out pulleys that can cause sluggish gear changes, though users should note this set is specific to these CUES models and may not fit older Shimano derailleur architectures.
| Model Part Number | Y3JK98010 |
|---|---|
| Brand | Shimano |
No, this specific pulley set is engineered exclusively for the Shimano CUES RD-U4020 and RD-U3020 series.
Yes, ensure the guide pulley and tension pulley are placed in their specified locations as labeled on the derailleur cage.
Pulley lifespan depends on riding conditions, but you should replace them when the teeth look like 'shark fins' or the pulley has significant lateral play.
Yes, they feature pre-installed sealed bearing units to manage rotational load and reduce drag.
No, a standard hex wrench (usually 3mm or 4mm) is sufficient to remove the pulley cage bolts.
Verify that the guide and tension pulleys are in their correct respective positions and that the cage bolts are not overtightened.
Ensure the cage plates are fully closed and the chain is correctly threaded through the derailleur path, avoiding the metal tabs in the cage.
Installation requires a standard hex key to remove the derailleur pulley cage bolts. 1. Shift the chain to the smallest cog to reduce tension. 2. Unscrew the lower (tension) and upper (guide) pulley bolts. 3. Clean the mounting area thoroughly. 4. Install the new pulleys, ensuring they rotate freely and the cage is aligned correctly. Compatibility is strictly limited to Shimano CUES RD-U4020 and RD-U3020 rear derailleurs. For care, wipe away external grime after wet rides and apply a light bicycle-specific lubricant to the chain; the sealed bearings themselves are maintenance-free and should not be disassembled.
