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EXT Fork Servicing & Upgrades

ProFlow Suspension is the official service centre for EXT New Zealand and we deal direct with EXT so have easy access to parts and can tap into their suspension tuning genius.

ProFlow has the only license to tune EXT in NZ so make sure you book in with us when you need your EXT suspension serviced.

Fork Service


At ProFlow Suspension we strip the fork down to its component parts, inspect the parts for damage, clean everything, test the parts and reassemble the fork with brand new seals, oil, grease and foam rings.

We then test the fork using our CTW Dyno to ensure the forks are working correctly and are not faulty.

Factory Fork Service - $270

  • Full strip-down
  • Close inspection and thorough cleaning of all components
  • Rebuild with new genuine manufacturers seals (unless specified otherwise)
  • Vacuum bleed (some dampers are hand bleed) with high-performance oils
  • Function test with CTW Dyno / leak test
  • Return to pre-service settings
  • Function test with CTW Dyno


EXT ERA Fork: $350
Ohlins Forks: $330

World Cup Fork Service - $350

  • Standard service plus 
  • Dyno damper test pre strip down 
  • More in depth testing to examine what the shock is doing at any point in time and match the shock/fork to the bike and rider style. 


Ohlins Forks: $365

Understanding Your

Bike Fork

Air Springs

Air springs are more common in most modern mountain bike forks than coil springs. The air spring is set up to resist the weight of the rider so the heavier your are and the more aggressively you ride the more air you will need. Smaller more timid riders need less air. This is easily adjustable with a shock pump and can be adjusted in small increments to custom tune the fork to the rider. With a coil fork you need to change the spring, you can buy a range of spring weights which will be recommended for riders weight by the product manufacturer. If you're unsure if your forks are set up correctly then feel free to get in touch and we can take a look.


Dampers control the motion of the fork and make it feel less like a pogo stick and smoothing out all the bumps in the trail. Getting the damper set up properly will increase front wheel traction while riding rough trails and while cornering. The damper in your fork is filled with hydraulic fluid, the movement of this fluid is controlled by the compression, rebound and lockout dials on your fork which open/close various ports. For example the lock out dial simply closes all of the damper ports, stopping oil from flowing and therefore stopping the fork from moving. ​ Your damper is filled with hydraulic fluid and the lockout, compression, and rebound controls are actuated by opening and closing various ports through which that fluid flows. For example, when you lock out your fork, you’re simply closing all of the damper’s ports, which keeps the oil from flowing.


It's important to get the rebound of your fork set up correctly because if it's too slow, your fork won't have rebounded fully before the next impact which makes your fork feel hard and will send impact through your hands. Too much rebound and you'll bounce off every root or rock you come across breaking traction and feeling sketchy.


The upper part of your fork is made up of the stanchions (legs which slide into the fork lowers), crown (connects stanchions to steerer) and steerer tube (connects the fork to your bike). This is known as the CSU (crown steerer unit).


Fork lowers connect the fork to your wheel and slide upwards during compression. Lowers house the bushings and lubricating oil, which make contact with your uppers. They also house the wiper seals which keep dirt out and the foam rings which provide lubricating oil to the seals and bushings.