The Heusinkveld Engineering Sim Pedals Ultimate Upgrade Kit is suitable for the original Sim Pedals Ultimate kit, and provides the benefits and main technical enhancements to your pedal set that are seen on the latest Sim Pedals Ultimate+. This upgrade kit will improve your Ultimate pedals in regards to durability, electronics and smartcontrol software with improved brake spring system components.EMC tested controller box, which can be used with the powerful Heusinkveld smartcontrol softwareAdded bearings on the spring rod pivots will improve the smoothness of the pedalThe rubber stack assembly includes a knurled knob for easy preload adjustmentThe brake rubber stack assembly is fitted with custom made Heusinkveld brake elastomers that give an unprecedented progressive feel to the brake pedal and have been tested to retain their performance even after a million duty cycles. Also in the kit are spring rod pivots which have internal bearings. This improves the smoothness of the pedal,