The Karcepts ND Rear Sway Bar Kit was designed specifically for the autocrossing world, but with such a large available range of adjustment, all forms of racing or sport driving may benefit from this product. As it pertains to autocrossing, we wanted to make certain a low enough torsion rate was obtainable with our sway bar kit. Too much rear bar, coupled with the ND Miata's low-end torque, along with aggressive autocross inputs can easily equate to undesirable on-throttle oversteer. With 9 possible adjustment settings, the perfect compromise between forward drive and on-throttle rotation can be found for different setups, surface conditions, and driving styles. New for 2026 is yet an even softer available rate option, catering to input from the AST autocross community.
- Sway bar rate is adjusted with one wrench, in only a few minutes
- Rate adjustments are made with the vehicle on the ground, even at low ride heights
- 9 possible adjustment settings, maximizing tunability and overall range
- Billet aluminum arms optimized for strength and weight utilizing the latest FEA software
- Light weight, zero deflection solid sway bar mounts provided for precise feel
- Low friction, solid polymer bearings eliminate bushing bind
- Heat treated and plated steel alloy PTFE lined endlinks and all hardware included
- Splined 0.63" diameter x 0.44” gun drilled spring steel sway bar center section
- Center section available in 0.56" turn down and 0.63" (no turn down)
View the installation instructions for any potential install/fitment questions you may have: Karcepts ND Rear Sway Bar Kit Installation Instructions
Sway Bar Rates:
OE ND Rear Sway Bar = 41 lbs/in
Karcepts ND Rear Sway Bar Kit - 0.56":
Hole 1/1 = 46 lbs/in
Hole 1/2 = 48 lbs/in
Hole 2/2 = 51 lbs/in
Hole 2/3 = 54 lbs/in
Hole 3/3 = 58 lbs/in
Hole 3/4 = 62 lbs/in
Hole 4/4 = 66 lbs/in
Hole 4/5 = 72 lbs/in
Hole 5/5 = 78 lbs/in
Kit Weight = 3.3 lbs
Karcepts ND Rear Sway Bar Kit - 0.63":
Hole 1/1 = 62 lbs/in
Hole 1/2 = 66 lbs/in
Hole 2/2 = 69 lbs/in
Hole 2/3 = 74 lbs/in
Hole 3/3 = 78 lbs/in
Hole 3/4 = 84 lbs/in
Hole 4/4 = 90 lbs/in
Hole 4/5 = 98 lbs/in
Hole 5/5 = 105 lbs/in
Kit Weight = 3.8 lbs
Before purchasing a Karcepts Sway Bar Kit, we recommend all potential customers read our Sway Bar Disclaimer/Maintenance page as well as our Terms & Conditions.