{"product_id":"len-performance-front-track-shock-polaris-indy-matryx-54-50003f","title":"Len Performance Front Track (Center) Shock, Polaris Indy VR1 \/ XC \/ XCR \/ Adventure Matryx 2021–2026 (54-50003F)","description":"\u003cp\u003eLen Performance LS4-50003F rebuildable front track shock, also called the center shock, for the rear suspension on the 2021–2026 Polaris Matryx Indy VR1, XC, XCR and Adventure 128 \/ 129 \/ 136 \/ 137 in 650, 850, Patriot Boost and Patriot 9R. It replaces the factory front track shock with a coil-over reservoir shock. At $520.95 each, it is A2D's value pick for a rebuildable, adjustable reservoir front track shock: clicker adjustment, a reservoir and a serviceable design without the cost of a race-level shock.\u003c\/p\u003e\u003cp\u003eThe front track shock controls how the skid loads under acceleration, how the sled transfers weight and how much ski pressure you keep when you get on the throttle. Being able to adjust it, rather than living with fixed factory valving, is the single biggest change most riders feel in the rear suspension. 5-click compression adjustment and threaded preload rings let it be set for rider weight and trail conditions.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFitment.\u003c\/strong\u003e Sold each. Pairs with the Len Performance 54-50003R rear track shock for a complete rear suspension (Len Performance sells the pair as kit LS4-50003K). Matching ski shock: 54-50000. Chassis: Polaris Matryx.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFitment list\u003c\/strong\u003e (Len Performance year\/model lookup)\u003c\/p\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003eIndy:\u003c\/strong\u003e 2021-2023 650 Indy VR1 129 Matryx; 2021-2026 650 Indy VR1 137 Matryx; 2021-2023 850 Indy VR1 129 Matryx; 2021-2026 850 Indy VR1 137 Matryx; 2022-2024 650 Indy XC 129 Matryx; 2022-2026 650 Indy XC 137 Matryx; 2022-2025 650 Indy XCR 128; 2022-2025 650 Indy XCR 136 Matryx; 2022-2023 850 Indy Adventure 137 Matryx; 2022-2024 850 Indy XC 129 Matryx; 2022-2026 850 Indy XC 137 Matryx; 2022-2025 850 Indy XCR 128 Matryx; 2022-2025 850 Indy XCR 136 Matryx; 2023 Patriot Boost Indy VR1 129 Matryx; 2023 Patriot Boost Indy VR1 137 Matryx; 2025 Patriot 9R Indy XCR 128 Matryx; 2025 Patriot 9R Indy XCR 136 Matryx; 2026 650 Indy XCR 129; 2026 650 Indy XCR 137; 2026 Patriot 9R Indy XCR 129; 2026 Patriot 9R Indy XCR 137\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e5-click compression adjustment, tool-free.\u003c\/li\u003e\n\u003cli\u003eAluminum reservoir shock: the remote-style reservoir keeps oil temperature down and damping consistent on long pulls.\u003c\/li\u003e\n\u003cli\u003eFully rebuildable, serviceable shock. Len Performance rebuild kits and replacement parts are available.\u003c\/li\u003e\n\u003cli\u003eHardened chromoly shaft for strength and seal life.\u003c\/li\u003e\n\u003cli\u003eForged aluminum eyelet heads with premium steel and NBR bushings.\u003c\/li\u003e\n\u003cli\u003ePowder-coated spring resists corrosion and holds rate in cold, wet conditions.\u003c\/li\u003e\n\u003cli\u003eThreaded shock body with anodized dual-ring locking preload adjusters: set sag once and it stays set.\u003c\/li\u003e\n\u003cli\u003eSold each.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e54-50003F (Len Performance LS4-50003F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOEM part number replaced\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e7045430 (per distributor listings)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShock location\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFront track shock \/ center shock (rear suspension)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eChassis \/ platform\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePolaris Matryx\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAdjustments\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCompression (5), plus threaded spring preload\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLength, extended\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e329 mm \/ 12.96 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLength, compressed\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e232 mm \/ 9.14 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStroke\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e97 mm \/ 3.82 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSpring\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePowder-coated coil spring included, 72 mm \/ 2.84 in diameter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTop eyelet\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14.5 mm ID x 42.7 mm wide (0.58 in x 1.68 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBottom eyelet\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e18 mm ID x 29.5 mm wide (0.71 in x 1.17 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5.20 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIncludes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOne shock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRebuild kit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLen Performance rebuild kits available; call to confirm the kit number for this shock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSold\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEach\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp\u003e\u003cstrong\u003eOrdering and installation.\u003c\/strong\u003e Sold each. Ships from stock at our Anchorage shop, or from our distributor's Boise, Idaho warehouse when not on the shelf. In-store pickup is available at checkout. Installation and shock setup are available at A2D Motorsports; call (907) 306-3062 to schedule. Len Performance rebuild kits are available, so the shock can be serviced or re-valved rather than replaced.\u003c\/p\u003e","brand":"Len Performance","offers":[{"title":"Default Title","offer_id":48786226020597,"sku":"54-50003F","price":520.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/0267\/9029\/files\/len-54-50003F.jpg?v=1790126900","url":"https:\/\/a2dmotorsports.net\/products\/len-performance-front-track-shock-polaris-indy-matryx-54-50003f","provider":"Shop A2D Motorsports ","version":"1.0","type":"link"}