{"product_id":"polaris-rzr-trail-900-keller-ball-joints","title":"Keller Polaris RZR Trail 900 Ball Joints (2021+)","description":"\u003cp\u003e\u003cstrong\u003ePolaris RZR Trail 900 ball joints fail at the snap ring, not the joint itself.\u003c\/strong\u003e That thin clip is the only thing holding a factory joint in the A-arm, and tight technical trail work is exactly the duty cycle that finds it. Keller ball joints remove it entirely — the two-piece housing threads into the arm like a nut and bolt. Hardened 4340 chromoly, greaseable, adjustable and rebuildable.\u003c\/p\u003e\n\u003cp\u003eTodd Keller's original threaded design, covering the 50-inch RZR Trail 900 from 2021 onward. On this machine the same joint serves both positions, so you simply choose how many you need.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eTwo-piece threaded housing eliminates the OEM snap ring\u003c\/li\u003e\n\u003cli\u003e4340 hardened chromoly steel housings and studs\u003c\/li\u003e\n\u003cli\u003eAdjustable and greaseable for correct stud articulation over years of service\u003c\/li\u003e\n\u003cli\u003eRebuildable — a worn joint is serviced, not replaced\u003c\/li\u003e\n\u003cli\u003eOne joint fits both upper and lower positions on this platform\u003c\/li\u003e\n\u003cli\u003eLimited lifetime warranty against manufacturing defects\u003c\/li\u003e\n\u003cli\u003eMade in USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eBuilt To Solve: RZR Trail 900 Ball Joint Pull-Out and Snap Ring Failure\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSnap ring shearing and letting the joint separate from the A-arm\u003c\/li\u003e\n\u003cli\u003eClunking or knocking from the front end over roots, rock ledges and ruts\u003c\/li\u003e\n\u003cli\u003ePlay in the wheel when rocked top-to-bottom on a jack\u003c\/li\u003e\n\u003cli\u003eRepeat OEM joint failures on a machine that spends its life at full steering lock\u003c\/li\u003e\n\u003cli\u003eTorn boots admitting water and grit so the joint wears from the inside\u003c\/li\u003e\n\u003cli\u003eReplacing the same joint often enough that it has become routine maintenance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eBest For: Tight-Trail and Wooded-Terrain RZR Trail 900 Riders\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eRZR Trail 900 owners riding narrow, rocky or rooted trail systems\u003c\/li\u003e\n\u003cli\u003eRiders who spend most of the day at or near full lock rather than at speed\u003c\/li\u003e\n\u003cli\u003eOwners who have already replaced an OEM joint and do not want to do it again\u003c\/li\u003e\n\u003cli\u003eMachines running larger or more aggressive tires than stock\u003c\/li\u003e\n\u003cli\u003eAnyone who wants a serviceable joint rather than another disposable one\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf the joints are sound but the boots are torn, the Keller boot replacement kit is the cheaper fix.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMaterial: 4340 hardened chromoly steel, stud and housing\u003c\/li\u003e\n\u003cli\u003eDesign: two-piece threaded housing, no snap ring\u003c\/li\u003e\n\u003cli\u003eServiceability: adjustable, greaseable and rebuildable\u003c\/li\u003e\n\u003cli\u003eA-arm modification: not required\u003c\/li\u003e\n\u003cli\u003ePositions: one joint serves both upper and lower on this platform\u003c\/li\u003e\n\u003cli\u003eWarranty: limited lifetime against manufacturing defects, original purchaser\u003c\/li\u003e\n\u003cli\u003eManufacturer Part Number: BJK-P-RG#AM (one joint), BJK-P-RG-K-2#AM (two joints)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003ePolaris RZR Trail 900: 2021 onward\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis is the 50-inch Trail 900 specifically. The wider Trail S 900 and Trail S 1000 take their own Keller listings, so check which car you have before ordering. Fitment is not guaranteed on applications not listed above.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003ch3\u003eWhy do RZR Trail 900 ball joints pull out of the A-arm?\u003c\/h3\u003e\n\u003cp\u003eThe factory joint is retained by a snap ring seated in a groove. Side load at full steering lock, rock strikes and the extra leverage of bigger tires can deform or shear that ring, and once it goes the joint has nothing holding it. Keller joints thread into the A-arm instead, so there is no clip to fail.\u003c\/p\u003e\n\u003ch3\u003eIs this the same part as the Trail S 900 or Trail S 1000?\u003c\/h3\u003e\n\u003cp\u003eThe physical joint is shared across much of the platform, but each car has its own SuperATV listing and part number. Order from this page for the 50-inch Trail 900 and from the matching page for a Trail S.\u003c\/p\u003e\n\u003ch3\u003eDo I need different joints for the upper and lower positions?\u003c\/h3\u003e\n\u003cp\u003eNo. On the Trail 900 the same Keller joint serves both positions, which is why this product is sold by quantity rather than by upper and lower.\u003c\/p\u003e\n\u003ch3\u003eHow many do I need for a full front end?\u003c\/h3\u003e\n\u003cp\u003eFour — two per side. SuperATV lists this car in single and two-joint quantities, so a complete front end is two of the two-joint option.\u003c\/p\u003e\n\u003ch3\u003eDo Keller ball joints require A-arm modification?\u003c\/h3\u003e\n\u003cp\u003eStandard Keller joints do not — they thread into the factory arm as supplied. The Mega version uses an oversized housing and does require machined A-arms, which is the main reason to pick one over the other.\u003c\/p\u003e\n\u003ch3\u003eCan these be rebuilt instead of replaced?\u003c\/h3\u003e\n\u003cp\u003eYes. They grease and adjust, and the Keller ball joint rebuild kit for Polaris services them with a new cup, boot and pin when the internals eventually wear.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eWhy Keller\u003c\/h2\u003e\n\u003cp\u003eTodd Keller designed the two-piece threaded ball joint to fix the one part of a stock front end that keeps failing, and SuperATV now builds and backs the line. The design has barely changed because it does not need to: thread the housing in like a nut and bolt, use a chromoly stud, and make the whole assembly serviceable so a worn joint gets rebuilt rather than binned.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eComplete Your RZR Trail 900 Front End Rebuild\u003c\/h2\u003e\n\u003cp\u003eBefore ordering, confirm you have the 50-inch Trail 900 rather than a Trail S, then decide whether you are replacing a single failure or doing all four corners. If the boots are torn but the joints are sound, the Keller boot replacement kit is the cheaper fix. If the joints are worn but the housings are good, the Keller rebuild kit for Polaris services them. Tie rods and A-arm bushings are worth inspecting while everything is apart.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eInstallation Video\u003c\/h2\u003e\n\u003cp\u003eOfficial SuperATV installation walkthrough with Todd Keller: \u003ca href=\"https:\/\/www.youtube.com\/watch?v=Mbt4iX4DWRA\" target=\"_blank\" rel=\"noopener\"\u003eHow To Install Keller Ball Joints\u003c\/a\u003e\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Why do RZR Trail 900 ball joints pull out of the A-arm?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The factory joint is retained by a snap ring seated in a groove. Side load at full steering lock, rock strikes and the extra leverage of bigger tires can deform or shear that ring, and once it goes the joint has nothing holding it. Keller joints thread into the A-arm instead, so there is no clip to fail.\"}},{\"@type\":\"Question\",\"name\":\"Is this the same part as the Trail S 900 or Trail S 1000?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The physical joint is shared across much of the platform, but each car has its own SuperATV listing and part number. Order from this page for the 50-inch Trail 900 and from the matching page for a Trail S.\"}},{\"@type\":\"Question\",\"name\":\"Do I need different joints for the upper and lower positions?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. On the Trail 900 the same Keller joint serves both positions, which is why this product is sold by quantity rather than by upper and lower.\"}},{\"@type\":\"Question\",\"name\":\"How many do I need for a full front end?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Four - two per side. SuperATV lists this car in single and two-joint quantities, so a complete front end is two of the two-joint option.\"}},{\"@type\":\"Question\",\"name\":\"Do Keller ball joints require A-arm modification?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Standard Keller joints do not - they thread into the factory arm as supplied. The Mega version uses an oversized housing and does require machined A-arms, which is the main reason to pick one over the other.\"}},{\"@type\":\"Question\",\"name\":\"Can these be rebuilt instead of replaced?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. They grease and adjust, and the Keller ball joint rebuild kit for Polaris services them with a new cup, boot and pin when the internals eventually wear.\"}}]},{\"@type\":\"VideoObject\",\"name\":\"How To Install Keller Ball Joints With Todd Keller\",\"description\":\"Official SuperATV walkthrough showing how Keller two-piece threaded ball joints install into the A-arm without a snap ring.\",\"thumbnailUrl\":\"https:\/\/i.ytimg.com\/vi\/Mbt4iX4DWRA\/hqdefault.jpg\",\"uploadDate\":\"2022-08-03\",\"embedUrl\":\"https:\/\/www.youtube.com\/embed\/Mbt4iX4DWRA\",\"contentUrl\":\"https:\/\/www.youtube.com\/watch?v=Mbt4iX4DWRA\"}]}\u003c\/script\u003e","brand":"Keller","offers":[{"title":"1 joint","offer_id":67590746275876,"sku":"BJK-P-RG#AM","price":153.95,"currency_code":"USD","in_stock":true},{"title":"2 joints","offer_id":67590746308644,"sku":"BJK-P-RG-K-2#AM","price":307.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0694\/6488\/3236\/files\/bjk-p-tspr_1_2_1_1_1_1_66a4fd8c-6202-4709-8b03-bba797454d36.jpg?v=1790927821","url":"https:\/\/dunes2dezertsxs.com\/products\/polaris-rzr-trail-900-keller-ball-joints","provider":"Dunes 2 Dezert SXS","version":"1.0","type":"link"}