How To Adjust Shimano Nexus 8-Speed Internal Gear Hub (SG-8R20)
Jadon Lee et un autre contributeur
Dernière mise à jour le 19 août 2025
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Introduction
Passez à l'étape 1 ↓If the gear selector isn't reaching its full range on the Shimano Nexus 8-speed internal hub (model SG-8R20), use this guide to properly set the shifting to reach the full shifting range and so that your shifter operates smoothly. This guide also works for Shimano Nexus 7-Speed internal gear hubs.
The internal gear hub system is controlled by how much the shifter (on the handlebar) pulls on the shifting cable, which connects to the internal gear hub. If the cable isn't being pulled by the correct amount, it will not set the internal gear hub to the intended gear.
A common issue in these systems is that the cable stretches over time, causing it to lose tension. If this issue isn’t corrected, the internal gear hub can be permanently damaged because it may end up positioned between gears rather than on a single gear setting.
Before using this guide, ensure that the shifter (on the handlebar) is properly functioning by changing the gearing and monitoring the cable in the rear of the bike (where it connects to the internal gear hub) to see that it is moving.
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Set the gearing to the 4th position on your shifter.
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Locate the alignment indicators on the right side (chain side) of the gear hub.
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If you can only see one indicator (as in picture 1), then your shifting is far out of alignment.
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Flip the bike and check the underside indicator.
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If the indicator closer the the wheel is further from the front of the bike, tighten the cable.
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Shift to the lowest gear.
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Insert a 2.5 mm hex key into the hole on the shifting mechanism and pull the shifter counterclockwise to relieve tension in the cable.
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Carefully remove the cable from the shifter.
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Use a set or combination of pliers and/or wrenches to loosen the cable nut.
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Rotate the two halves of the cable nut in opposite directions, turning the half facing you counterclockwise.
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Use a 2.5 mm hex wrench to pull the shifting mechanism counterclockwise again.
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Insert the cable nut into its slot, ensuring the cable sits snugly against the shifting mechanism. Slowly ease pressure off the hex wrench.
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Once the alignment markers are close to each other, adjust the screw on the shifter to fine-tune the cable tension.
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If the adjustment screw reaches its limit—too loose and nearly falling out, or too tight to turn—return to Step 3.
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Take your bike for a test ride! If the gears feel easier to shift or you cannot reach a higher gear, readjust the shifting and make sure the cable nut is properly tightened.
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