Threadless Compression System – the method in which the headset components are compressed and secured to the deck, fork, and bars.
“StandardCompressionSystem:” the handlebars sit on top of the fork and utilize a clamp that tightens uniformly over both. The clamp typically has four or more bolts and does not require a slit in the handlebars.
SCS may be the heaviest of all compression systems but in exchange is the sturdiest. SCS clamps are commonly found on higher-end scooters and can be easily accessed for maintenance by taking off your bars.
“HiddenInternalCompression:” the handlebars slide over the fork and a clamp fits over both, tightening the handlebars directly to the fork. Encasing the fork, a bolt and shim compress the headset components for a smooth spinning deck that won’t come loose as you ride.
HIC is the most common compression systems because of weight, durability and cost. HIC systems are generally found on mid to high-range scooters and can be easily accessed for maintenance by taking off your bars.
“InvertedCompressionSystem:” utilizes a bolt inserted through the fork and screws into a star nut inside the downtube of the handlebar.
Although ICS is the simplest and cheapest method of threadless compression, it requires the most upkeep. ICS at times requires frequent tightening and that requires removing the front wheel to gain access.
ICS compression only works for handlebars with a standard inner diameter. Installation requires a slit in the bar as well as a specific “star nut” tool to install the star nut inside the bars.
Pytel is a new form of compression which is built into the clamp and can be adjusted without having to take anything apart. The clamp has three bolts and is tightened in only a few simple steps. First, you apply downward pressure with the entire clamp loose. Tighten the top two bolts as you apply pressure - this will ensure the bottom portion of the clamp compresses the headset as the angular surfaces create a wedge. Please note, it’s important to grease the angled surfaces of the clamp to ensure it fully tightens without binding.
Pytel it is one of the lightest and simplest systems available. However, since the system is so new, it currently is solely compatible with aluminum bars with a 2" slit, so ensure to check your setup before purchasing (standard inner-diameter with oversized outer-diameter).
Before these adapter shims. IHC forks only worked with standard sized bars. These shims have thicker walls, still fit for the smaller diameter IHC forks on the inside, but are now fit for an oversized bar on the outside.
Before bar inserts, when converting to an SCS, the vertical slit in the handle bars would have to be cut off in order to work properly with the SCS, sacrificing the length of the bars. Now, thanks to Phoenix Pro Scooters, we have bar inserts that slide into the bar, reinforcing the bars where the slit would have before created a weak point.