If you’ve ever built or upgraded a stunt scooter, you’ve probably heard riders talk about compression systems. Compression is what holds the fork, headset and bars together, keeping your scooter tight while still allowing the bars to spin smoothly.
There are several different compression systems used in stunt scooters, each designed for different setups and rider preferences. In this guide we’ll explain the most common scooter compression systems and how they work.
What Is a Compression System?
A compression system keeps the fork, headset and bars securely tightened together while still allowing the scooter to rotate smoothly when doing tricks.
Without compression, the front end of your scooter would become loose and rattly. A properly tightened compression system removes headset movement while keeping the bars spinning freely.
Different systems achieve this in slightly different ways.
HIC (Hidden Internal Compression)
HIC is one of the most common compression systems used on stunt scooters.
It works using a shim that sits and cap over the fork and inside the bars. A compression bolt then pulls everything together through the headset.
HIC systems are popular because they are:
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strong and reliable
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relatively simple to install
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compatible with many bars
Note, this can only be used with oversized bars.
IHC (Internal Hidden Compression)
IHC is similar to HIC but designed for standard diameter bars.
The fork has a smaller steerer tube which allows the compression to sit inside bars with a smaller internal diameter.
IHC systems are known for being:
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lightweight
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simple to maintain
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common on many complete scooters
Note, bars can be standard or oversized providing the internal diameter is the same. Aluminium bars for example are standard on the inside, and oversized on the outside due to using thicker walls than steel and titanium.
SCS (Standard Compression System)
SCS is another very popular compression system, especially for street riders.
Unlike other systems, the clamp itself acts as part of the compression system, meaning a separate compression shim isn’t required.
Benefits of SCS include:
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extremely strong
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very reliable
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great for heavier riding styles
Because of its strength, SCS is often used on street style setups.
ICS (Internal Compression System)
ICS was one of the earlier compression systems used on stunt scooters.
It works by tightening a bolt from the bottom of the fork, pulling the fork and bars together through the headset.
While it can still be found on some scooters, ICS is less common today because newer systems like HIC, IHC and SCS are generally easier to adjust.
Which Compression System Is Best?
There isn’t one “best” compression system, it mostly comes down to compatibility and rider preference.
Many riders choose compression based on their style. Most park riders will run an IHC or HIC setup, due to the benefits in reduced weight. Whereas street riders run SCS due to the strength and look. As long as the system is installed and tightened properly, each option can provide a smooth and reliable ride.
Final Thoughts
Compression systems play a key role in keeping your stunt scooter tight and riding as it should. Understanding how they work makes it easier to maintain your scooter and choose compatible parts when upgrading.
Whether you're riding HIC, IHC or SCS, making sure your compression is properly tightened will help keep your scooter feeling smooth and solid.