9905-1031 - REAR Freightliner XC / Roadmaster RR4R / Alpine Peak / Spartan Summit-Alpine (Koni EVO)

9905-1031  -  REAR Freightliner XC / Roadmaster RR4R / Alpine Peak / Spartan Summit-Alpine (Koni EVO)


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Most orders are shipped within 24 hours from the order date. Orders placed on the weekend or after cutoff on Friday, and orders placed on select holidays are processed on the next business day. Please see our shipping terms for more information.

Koni 9905-1031


Experience a smooth controlled ride on your Class A motor home with Koni EVO 99 shock absorbers. Koni's patented open intake valves ensure that you get a smooth ride along with enough force to keep your RV from bouncing down the road. EVO 99 is especially good on independent front suspensions that have a limited amount of shock travel. Large piston holes and custom tuned valve stack ensure that you have extra body control when you need it without undue harshness.  You don't want poor road conditions to spoil your cross-country trip. The 50mm bore piston reduces internal pressure for smooth operation over rough roads, and the digressive valve stack and modular piston design control bouncing over bridges and large bumps.

The EVO series is Koni's latest shock design. The main difference between the FSD and the EVO series piston is that it is almost 40% larger than the FSD series (50 mm vs 36 mm). The larger size means that it can take a lot more force, or the same force with less pressure which helps with cooling and better responsiveness. The larger body diameter allows for more oil capacity which also helps with cooling and increases the longevity of the shock. EVO series has a higher tensile strength than previous Koni designs. EVO incorporates open intake valves + FSD technology which exceeds the performance of FSD technology alone. 


  • Freightliner XC Rear
  • Freightliner IFS Rear
  • Freightliner XC Tag Axle
  • Freightliner FL60 Rear
  • Roadmaster RR4R R4R Rear
  • Alpine Peak Rear
  • Spartan Summit Rear
  • Roadmaster RM4C Rear
  • Monaco Vesta 2011-2012 Rear
  • Holiday Rambler Trip 2011-2012 Rear

    Collapsed LengthExtended LengthUpper MountLower Mount
    20.16"Eye 3/4"Eye 3/4"

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    WARNING: Products may contain one or more chemicals known in the State of California to cause cancer and/or birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov

    Shipping Insurance Notice

    NOTICE: For orders outside of United States

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    • Views: 3244
    • Brand: Koni
    • Product Code: 9905-1031
    • Availability: 18
    • $250.00

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    This product has a minimum quantity of 2