Shimano’s Shadow Plus rear derailleurs have improved chain retention and shift accuracy by reducing the movement of the derailleur’s cage while riding. The clutch mechanism inside a Shimano Shadow Plus rear derailleur uses friction to resist the forward movement of the derailleur cage. Over time riders may find they need to increase the amount of friction on the clutch to account for normal wear. This tutorial will keep your Shimano XTR, XT or SLX Shadow Plus rear derailleur shifting with precision and a bare minimum of chain slap for many miles to come.
How Shadow Plus works
When you flip the clutch switch from the ‘off’ to the ‘on’ position, you are rotating a cam that presses against a steel band that wraps around the clutch. When engaged, this band increases the amount of friction on the clutch, thereby increasing the amount of force required to move the derailleur cage.
The cage will still move, just not as freely as the cage of a derailleur without this clutch mechanism will.
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Shadow Plus in the 'off' position: The cam is not engaged and is not exerting any force on the friction band; in this mode the derailleur functions like any other, relying on the plate tension spring to resist the forward movement of the derailleur cage.
Adjusting your Shadow Plus clutch
- Time: 20 minutes
- Skill rating: Easy
- Cost: Free
Tools you'll need
- 2mm allen key
- Needle-nose pliers ((for direct-mount XTR and all XT and SLX Shadow Plus derailleurs))
Step 1: Disengage the clutch mechanism
Step 2: Remove the clutch cover
Step 3: Tighten the friction band
Step 4: Test the tension
Step 5: Reinstall the clutch cover
Step 6: Test ride
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