Len Performance Rear Track Shock, Polaris Indy VR1 / XC / XCR / Adventure Matryx 2021–2026 (54-50003R)
Len Performance Rear Track Shock, Polaris Indy VR1 / XC / XCR / Adventure Matryx 2021–2026 (54-50003R)
Len Performance
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Product details
Len Performance LS4-50003R rebuildable rear track 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 rear track shock with a reservoir shock that has 5-click compression adjustment. At $419.95 each, it is A2D's value pick for a rebuildable, adjustable reservoir rear track shock: clicker adjustment, a reservoir and a serviceable design without the cost of a race-level shock.
The rear track shock sets how the skid handles big hits, G-outs and bottoming with a passenger or gear on the tunnel. This is a springless unit that works with the factory rear torsion springs, so it drops in without changing the rest of the skid.
Fitment. Sold each. Pairs with the Len Performance 54-50003F front track shock for a complete rear suspension (Len Performance sells the pair as kit LS4-50003K). Matching ski shock: 54-50000. Chassis: Polaris Matryx.
Fitment list (Len Performance year/model lookup)
- Indy: 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
Features
- 5-click compression adjustment, tool-free.
- Aluminum reservoir shock: the remote-style reservoir keeps oil temperature down and damping consistent on long pulls.
- Fully rebuildable, serviceable shock. Len Performance rebuild kits and replacement parts are available.
- Hardened chromoly shaft for strength and seal life.
- Forged aluminum eyelet heads with premium steel and NBR bushings.
- Sold each.
Specifications
| Part number | 54-50003R (Len Performance LS4-50003R) |
| OEM part number replaced | 7045431 (per distributor listings) |
| Shock location | Rear track shock (rear suspension) |
| Chassis / platform | Polaris Matryx |
| Adjustments | Compression (5) |
| Length, extended | 489 mm / 19.26 in |
| Length, compressed | 342 mm / 13.47 in |
| Stroke | 147 mm / 5.79 in |
| Spring | None (uses the factory torsion springs) |
| Top eyelet | 17.8 mm ID x 29.5 mm wide (0.71 in x 1.17 in) |
| Bottom eyelet | 8 mm ID x 22.3 mm wide (0.32 in x 0.88 in) |
| Weight | 3.84 lb |
| Includes | One shock |
| Rebuild kit | Len Performance rebuild kits available; call to confirm the kit number for this shock |
| Sold | Each |
Ordering and installation. 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.