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The spring rate of the Suntour NEX suspension fork can be adjusted to be softer or firmer.
The adjustment knob is located on the left side of the suspension fork. First remove the cap covering the adjustment knob. Use a flat head screw driver and be careful not to force the cap off too vigorously.
Use a 5mm HEX key to adjust the knob. (Some fork models use the slotted head and can be adjusted with a coin)
For a firmer ride adjust the screw clockwise a few clicks
For a softer ride, adjust the knob counter clockwise a few clicks