Circuit Sports Adjustable Rear Upper Leading Arms: 2015+ Mazda Miata MX-5 (ND)

Circuit Sports Adjustable Rear Upper Leading Arm is a direct replacement of the Mazda MX-5 Miata (ND) factory link: part
#N243-28-20X. Our arm uses Teflon-lined spherical (pillowball) Heim joints with steel spacers as well as high tensile strength carbon
steel u-brackets to ensure that each arm is made for high quality as well as increased strength, precision, and longevity. Each part
retains the qualities of the OEM unit but is designed on improving strength and allow for increased adjustability in fine tuning. The
body of the tubular arms are finished off in our signature Circuit Sports high-gloss blue powdercoat to help resist against rust,
damage, stain and oxidation.
Rear OEM alignment specifications are relatively conservative and max out at just about -2* of camber at the eccentric cam bolt,
with a max of about 7.0mm link movement. However when used in conjunction with our other ND arms/links, camber and toe can
be further increased, decreased, and/or corrected with more precision depending on the application; whether it’s to increase
traction, improve high-speed stability, or cornering effectiveness and speed. This allows for quicker and finer adjustments with more
range without having to adjust the eccentric cam bolts, which means that the user can make more aggressive track adjustments and
yet revert back to the previous configuration for street without changing baseline alignment settings. Circuit Sports recommends
setting all arms/links to oem spec as a baseline before making adjustments and documenting the lengths as reference to your
specific application and vehicle height (for easier recall and consistent adjustment).