FAST SC4 Cartridge Upgrade ( Fox, RockShox, Marzocchi)

Why the SC4 cartridge is your best ally?

Simply put, it’s down to its specific conception with 3 independent compression ways, inspired from our up kit.
Low speed for comfort on small hits, medium speed to manage diving and balance of the bike and finally a circuit dedicated to high speed/impacts to flatten the ground.

The rebound is externally adjustable for the low speed. The high speed rebound shims stack will be set according to your expectations.


+ 3 independent compression circuits
+ The only kit to use hydraulics to manage the diving and balance of the bike
+ Blow Off Valve on high speed to flatten the bumps
+ More grip
+ Comfort and endurance
+ 100% sealed system thanks to Fast’s CELL FOAM

The SC4 cartridge is:

• An unique conception with 3 independent ways
• Custom Aeronautical 7075 T6 alloy
• Performing, durable, consistent

for YARI forks from 2017 onwards.

 for REVELATION forks 35mm from 2018 onwards. 

for LYRIK forks 35mm

for PIKE forks 35mm from 2016 onwards. 

for FOX 36 forks 36mm from 2015 onwards.

for FOX 38  

for SUNTOUR AION and AURON 35mm forks

for MARZOCCHI Z1 from 2019 onwards.