RPG Off-Road 15+ F150 | 17-20 Raptor Stage 1 Frame Support Kit


  • Lifetime Warranty
  • Able to use Fox or King 2.5″ Bump Stops
  • Added strength to the frame rail
  • Includes strike plates
  • Works with factory leaf springs, Deaver leaf springs and Icon leaf springs
  • Ability to swap in 2×5″ x 4″ bump stops for towing/hauling
SKU: RBPA0001_2.5 Category:

RPG Offroad’s Stage 2 Frame Support kit is the industries best selling rear frame support/gusset kit, with the ability to use Fox or King 2.5″ bump stops. When adding the Stage 2 Frame Support kit to your 15+ F150 or 17-20 Raptor, you will not only strengthen the rear frame and gain the peace of mind you are looking for, you will also be adding needed bottom-out control using those Fox or King 2.5 bump stops.   These are the same Air Bumps you will find on a good portion of the race cars competing in the Baja 1000. This product is also compatible with both OEM leaf springs and aftermarket springs.

Why pay hundreds more for less???


  • 3x thicker than the stock frame rail
  • Ability to run 4″ stroke air bumps to increase payloads and towing
  • 100% Lifetime Warranty
  • Able to run very little air pressure for smooth and controlled ride
  • Double cross bolt design to eliminate inward frame movement
  • Doesn’t interfere with aftermarket exhaust options
  • No gimmicks, just proven results with the offroad miles to prove it

Now for the long story of why RPG over the others:
The frame support is over 3 times thicker than the stock frame, and transfers the energy to a much larger cross section of the frame. Unlike other systems that are out there, we intentionally didn’t enclose the whole frame rail. We left the inner rail open with the theory that in case of a rear-end collision, the frame still has a path of least resistance to follow. Another major benefit of going with the RPG Frame Support kit is the fact that we use a full size 2.5” bump stops vs. a 2.0” bump stop that is typically only found in light buggies and mid sized trucks on the racing circuits.
The Fox 2.5” bump stop is the same bump that is used on nearly every wining trophy truck that Fox or King sponsors. The reasons why you want to run a 2.5” vs. a 2.0” on your Raptor is the following.  A 2.5” bump stop has nearly 100% more piston surface than a 2.0″ air bump, plus has far greater amounts of fluid in the bump stop body itself to help with cooling the bump. This means you can run much less valving, much less nitrogen pressure and a much shorter shaft than a 2.0” inch like found on our competitors kits.  The Fox 2.5” bump stop only requires 2.5” of shaft travel vs. 3.75-4” of shaft travel with a 2.0”.  This results in a bump stop that sits further away from the axle. With the RPG kit you won’t be hitting the bumps around town on every dip, pothole and speed bump, and most importantly, your bump stop wont be the one controlling the ride, the shock will.  The only time a bump stop should be felt is in the last 15-20% of your full bottom out travel.  It should only be a last line of defense, not a ride characteristic tool. Our rebound valving is setup so it doesn’t interfere with the ride, and comes out fast as opposed to slowly like you will find on our competitors kits.  A fast rebound setup will prevent double bumping in whoop sections and allows for the bump to keep up with the whole suspension.  With our kit, you only need to run 90psi for both on road and offroad. There is no need to ever adjust it from there and it offers displays very little heat buildup which results in a much longer life span.
What comes in the box:

  • • RPG Frame Support with Air Bump Mounts
  • • FOX 2.5″ Air Bumps
  • • Grade 8 Hardware
  • • Axle Impact Pads
Additional Information
Weight 100 lbs
Dimensions 36 × 12 × 12 in
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