99B-3209 - FRONT Alpine Peak / RR4R / Workhorse R26 UFO / Spartan MountainMaster I-Beam / Tiffin Phaeton PowerGlide I-Beam (Koni EVO)

99B-3209  -  FRONT Alpine Peak / RR4R / Workhorse R26 UFO / Spartan MountainMaster I-Beam / Tiffin Phaeton PowerGlide I-Beam (Koni EVO)


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Koni 99B-3209

Note: Some Spartan applications do not have enough clearance to accommodate the larger diameter of this shock. Please measure your existing shock diameter if you have a Reyco Granning 1200 axle, the 99B-3209 is 2.75" in diameter.

This is the New Front Heavy Duty replacement shock for the 8805-1021 used previously on the front axle of the Alpine Peak, Roadmaster RR4R, Workhorse UFO & Spartan MountainMaster I-Beam chassis. It became evident after a few years that the 8805-1021 just wasn't holding up to the weight and demands of these chassis. The Koni engineers went to work and did real world testing to come up with a shock that would increase the ride comfort yet be built to withstand the most punishing demands thrown its way.

The main difference between the 8805 and the 99 series piston is that it is almost 40% larger than the 8805 series (50 mm vs 36). Which means it can take a lot more force, or the same force with less pressure. This improves durability and performance. The 99 series is also Koni's latest shock design. It was developed for high end motorcoaches in Europe, and Koni is just starting to introduce it in America in the RV market. Both shocks control up and down movement, but Koni has found a better balance between the two with the 99 series setting.

Ride Quality:

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. Our 50mm bore piston reduces internal pressure for smooth operation over rough roads, and our digressive valve stack and modular piston design control bouncing over bridges and large bumps.


Performance parts should last, and Koni EVO 99 shocks can go the distance with our industry leading 9 T tensile strength. We back our products up with a lifetime warranty for the original purchaser.

Worldwide Reputation:

Koni is known as the shock absorber specialist worldwide. We have committed ourselves to delivering the finest quality product with the best performance. This philosophy results in unrivaled durability, superb road performance and maximum customer satisfaction.


  • Alpine Peak Front
  • Roadmaster RR4R (4 Air Bag) Front
  • Workhorse UFO (Rear Gas Engine) Front
  • Spartan MountainMaster I-Beam Up to 2004 Front
  • Spartan MC2000 w/ 510AR Front
  • Tiffin Phaeton w/ PowerGlide I-Beam Front
  • Roadmaster RM4C Front
  • Safari Sahara (8 Air Bag, 4 Shocks) Front
  • Monaco Vesta 2011-2012
  • Holiday Rambler Trip 2011-2012
  • Entegra Aspire with Spartan MountainMaster I-Beam Eaton Axle (Excludes Model 1253 Axle calling for B46-2150 due to axle clearance)

Collapsed LengthExtended LengthUpper MountLower Mount
23.59"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

  • Views: 32636
  • Brand: Koni
  • Product Code: 99B-3209
  • Availability: In Stock
  • $283.50
  • $210.00
This product has a minimum quantity of 2