The Helm MKII Air contains a volume adjuster that allows the rider to pick and choose from a variety of different settings to find the perfect balance between a linear fork and a progressive fork. Some users might prefer a more linear setting for giving the most plush feeling possible to maximize traction over challenging terrain, while others would prefer to prioritize progression so that they always have more travel in reserve as they hit larger features. For most riders, finding a balance between the two is the goal, and the volume adjuster contained within the Helm is essential. 

You can also follow along in our video if you prefer to have a visual aid: 

Step 1: Remove the protective caps from the top and bottom of the fork on the left leg.

Step 2: Unthread the negative air spring charge button. 

Step 3: With the negative air spring charge button pressed down, simultaneously release all of the air from the fork through the schrader valve on the top. 

Step 4: Clean the top of the fork before removing the air valve assembly. 

Step 5: Using a 30mm socket, remove the air valve assembly.

Step 6: The Helm MKII Air is set up at the factory without the air volume piston installed. Before installing the gold piston, ensure that both the inner and outer O-rings are properly greased and in place..

Step 7: Slide the wing nut up indexed rod with the threads facing away from the air valve assembly.

Step 8: Set the piston to your desired position depending on how progressive you would like the fork to perform. As you move the piston further down the rod, the air volume will decrease, and the progression will increase. Ensure that the piston is properly settled into the indexed position on the rod. 

Step 9: Tighten the wing nut onto the piston threads.

Step 10: Apply a light coat of grease to the fork crown threads, and gently reinstall the air spring assembly by guiding the air piston into position. 

Step 11: Start threading the air volume assembly by hand to ensure that there is no cross threading. Then tighten it with a 30mm socket to 36Nm using a torque wrench. 

Step 12: With your air volume assembly reinstalled, add the desired PSI to your fork, and charge the negative air valve. By equalizing the chambers and allowing air to flow from the positive chamber to the negative chamber, the PSI in the positive chamber will drop, and it is recommended to repeat the inflation and negative pressure charging once or twice to ensure proper performance. 

Step 13: Close the negative air charge valve, and reinstall the protective caps on the top and bottom. 

Step 14: Go ride!