{"product_id":"spl-front-caster-rods-a90-supra-g29-z4","title":"SPL Front Caster Rods - A90 Supra \/ G29 Z4","description":"\u003cdiv\u003e \u003cdiv\u003e \u003cp\u003eThe SPL adjustable caster rods (TR G29) for the Toyota Supra (A90 \/ A91) and BMW Z4 (G29) provide adjustable caster and anti-dive to improve mechanical cornering grip and stability under aggressive braking. The billet aluminum arms use PTFE-lined, F1-fit FK USA spherical bushings to eliminate bushing deflection and bind, which are the primary causes of vague steering and braking feedback. The adjustable caster arms, aka tension rods, allow for a deeper customization of the suspension geometry to better suit your driving preferences and adapt to changes in tracks, aero loading, tires, and more.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv\u003e \u003ch3\u003eTechnical\u003c\/h3\u003e \u003ch4\u003eCaster Adjustment\u003c\/h4\u003e \u003cp\u003eSet the Ideal Caster for Better Lateral Grip\u003c\/p\u003e \u003cp\u003eCaster angle is critical to a MacPherson strut front suspension because it increases the amount of camber that is gained as steering angle is increased. It also improves the centering torque on the steering wheel for straight line stability and additional tire feedback. The result is better grip mid-corner and an improvement to peak braking by slightly reducing the need for static camber.\u003cbr\u003e\u003cbr\u003eAdjustable caster rods also allow you to adjust the wheel location (side view) to prevent tire rub with the front bumper, or fender in some cases as well as properly set the desired track width and camber angle while maintaining optimal kinematics, particularly bumpsteer.\u003c\/p\u003e \u003ch4\u003eTrack Width Adjustment\u003c\/h4\u003e \u003cp\u003eGet More from the Inner Tire\u003c\/p\u003e \u003cp\u003eExtending the front track width promotes a more neutral handling behavior and reduces the overall amount of weight that shifts off the inner tire and onto the heavily loaded outer. This is a major factor in improving the peak lateral grip on the short wheelbase Supra \/ Z4, and is especially helpful for any tire size limited class. The SPL front lower control arm (FLCA G29), SPL caster \/ tension rod (TR G29), and an adjustable camber plate allows you to properly maximize front track width, set your ideal camber angle, and optimize the front suspension setup.\u003c\/p\u003e \u003ch4\u003eAnti-Geometry Adjustment\u003c\/h4\u003e \u003cp\u003eFine Tune the Chassis Response Under Hard Braking\u003c\/p\u003e \u003cp\u003eIn the front, the provided spacers allow for fine tuning of the anti-dive geometry. The more anti-dive (expressed as a %) a car has less the front suspension will compress under braking. This is achieved by the arm geometry and tire grip working together to bear some of the load shift and keeping it from compressing the spring \/ damper. This geometry becomes more important as cars increase braking force with grippy tires and aero, especially on bumpy tracks and softer front spring rates. Changing anti-dive geometry can be helpful when setting up the front suspension to maintain acceptable front splitter heights or sufficient front suspension travel.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv\u003e \u003ch3\u003eBenefits\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eAdjustable Caster and Anti-Dive\u003c\/li\u003e \u003cli\u003eLightweight: 4.24 lbs (1.92 kg) per Side\u003c\/li\u003e \u003cli\u003eImproved Front Grip (with Steering Angle)\u003c\/li\u003e \u003cli\u003eBetter Front Kinematics with Aggressive Alignments\u003c\/li\u003e \u003cli\u003ePrecise Steering and Braking Feel\u003c\/li\u003e \u003cli\u003eImproved Braking Stability\u003c\/li\u003e \u003cli\u003eGreater Adaptability for Wheel\/Tire Clearance\u003c\/li\u003e \u003c\/ul\u003e \u003c\/div\u003e \u003cdiv\u003e \u003ch3\u003eMaterials\u003c\/h3\u003e \u003cul\u003e \u003cli\u003e6061-T6 Billet Aluminum Arms, 360° Clamps, and Clevis (Anodized Black)\u003c\/li\u003e \u003cli\u003e6061-T6 Billet, Hollow Aluminum Trailing Link (Anodized Black)\u003c\/li\u003e \u003cli\u003e4140 ChroMoly Clevis Stud\u003c\/li\u003e \u003cli\u003e6061-T6 Aluminum Adjustment Spacers\u003c\/li\u003e \u003cli\u003eZinc Plated Class 10.9 Metric Hardware\u003c\/li\u003e \u003cli\u003eTi-6Al-4V Titanium 1\/4\"-20 Socket Head Allen Screws (Anodized Blue)\u003c\/li\u003e \u003c\/ul\u003e \u003c\/div\u003e \u003cdiv\u003e\u003cimg title=\"made-in-usa.png\" src=\"https:\/\/cdn11.bigcommerce.com\/s-xn4bghc5\/product_images\/uploaded_images\/made-in-usa.png\" alt=\"made-in-usa.png\" width=\"319\" height=\"30\"\u003e\u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003ch3\u003eNoise, Vibration, and Harshness (NVH)\u003c\/h3\u003e \u003cimg src=\"https:\/\/cdn11.bigcommerce.com\/s-xn4bghc5\/images\/stencil\/original\/image-manager\/nvh-rating-6.png?t=1723245776\" alt=\"Product NVH Rating\"\u003e \u003cp\u003eThe caster arm bushings are an active part of NVH control strategy for the front suspension. The trade-off for performance is additional NVH over rough roads, particularly hard bumps, a small increase in road \/ tire noise, and a greater likelihood of tramlining for some setups. However, the ride quality on smoother roads, even with some rolling bumps, will be improved over stock due to the elimination of bushing bind. Going to a high-quality coilover with suitable spring rates will further enhance this improvement and mitigate some of the NVH impact.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv\u003e \u003ch3\u003eApplications\u003c\/h3\u003e \u003cp\u003e2020+ Toyota GR Supra (A90 \/ A91)\u003c\/p\u003e \u003cp\u003e2019+ BMW Z4 (G29)\u003c\/p\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cp\u003e\u003cstrong\u003eInstallation Instructions:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.dropbox.com\/scl\/fi\/eyked4gza6qfkwdro6jfk\/SPL-TR-G29-Rev-C.pdf?rlkey=fkmfrqvaj1gs86bgjg80cnyvz\u0026amp;dl=0\" target=\"_blank\" rel=\"noopener\"\u003eSPL Front Supra A90 \/ A91 + Z4 G29 Tension Arm Install Instructions\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"SPL Parts","offers":[{"title":"Default Title","offer_id":54599609254171,"sku":"SPL TR G29","price":1099.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/2123\/2667\/files\/SPL-TR-G29-L1-0-Tension-Rod-HiRes__62257.1787091337.jpg?v=1794416980","url":"https:\/\/www.sub2speedhouse.com\/products\/spl-front-caster-rods-a90-supra-g29-z4","provider":"SUB2 SPEEDHOUSE","version":"1.0","type":"link"}