Len Performance Ski Shock, Polaris RMK Khaos / Pro RMK AXYS & Matryx 2019–2026 (54-50004)
Len Performance Ski Shock, Polaris RMK Khaos / Pro RMK AXYS & Matryx 2019–2026 (54-50004)
Len Performance
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Product details
Len Performance LS8-50004 rebuildable ski shock for the Polaris 850 RMK Khaos (AXYS, 2019–2021), the 2021 AXYS 600 / 850 RMK Pro, and the 2022–2026 Matryx RMK Khaos, Khaos Slash, RMK Pro and Pro Slash in 650, 850, Patriot 9R and Patriot Boost, 146 through 174 in. tracks. One part number fits either side. At $522.95 each, it is A2D's value pick for a rebuildable, adjustable reservoir mountain ski shock: clicker adjustment, a reservoir and a serviceable design without the cost of a race-level shock.
This is the most adjustable ski shock in the Len Performance snow line: separate low-speed and high-speed compression clickers (8 low / 3 high) and an 8-click rebound adjuster, per Len Performance. Low-speed compression tunes how the front end settles on a sidehill and in the trees; high-speed compression handles re-entries and hard hits; rebound controls how quickly the ski comes back down. The threaded body with locking preload rings sets ski pressure for rider weight and snow conditions.
Fitment. Sold each; order two for a pair (Len Performance sells the pair as kit LS8-50004K). A2D also offers this shock as a two-shock pair bundle: Len Performance Polaris MATRYX RMK/KHAOS Ski Shocks (pair). Matching Len Performance track shocks for the Khaos skid are the 54-50004F front track shock and 54-50004R rear track shock. Chassis: Polaris AXYS (2019–2021) and Matryx (2022–2026).
Fitment list (Len Performance year/model lookup)
- RMK / Khaos: 2019-2026 850 RMK Khaos 155; 2019-2022 850 RMK Khaos 163/165; 2019-2026 850 RMK Khaos 165; 2021 600 AXYS RMK Pro 155; 2021 850 AXYS RMK Pro 155; 2021 850 AXYS RMK Pro 163/165; 2021 850 AXYS RMK Pro 174; 2022-2026 650 RMK Khaos Slash 146 Matryx; 2022-2024 650 RMK Pro 155; 2022-2024 850 RMK Khaos Slash 146; 2022-2024 850 RMK Khaos Slash 155; 2022-2024 850 RMK Khaos Slash 163/165; 2022-2026 850 RMK Pro 155; 2022 850 RMK Pro 163/165; 2022-2024 850 RMK Pro Slash 155; 2022-2024 850 RMK Pro Slash 163/165; 2022-2026 Patriot Boost RMK Khaos Matryx 155; 2022-2024 Patriot Boost RMK Khaos Slash 155; 2022-2024 Patriot Boost RMK Pro Slash 155; 2022-2024 Patriot Boost RMK Pro Slash 163/165; 2023-2026 Patriot 9R RMK Khaos 146 Matryx; 2023-2026 Patriot 9R RMK Khaos 155 Matryx; 2023-2026 Patriot 9R RMK Khaos 165 Matryx; 2023-2024 Patriot 9R RMK Khaos Slash 146; 2023-2024 Patriot 9R RMK Khaos Slash 155; 2023-2024 Patriot 9R RMK Khaos Slash 163/165; 2023-2024 Patriot 9R RMK Pro Slash 155; 2023-2024 Patriot 9R RMK Pro Slash 163/165; 2023-2024 Patriot Boost RMK Khaos Slash 163/165; 2025-2026 850 RMK Khaos 146; 2025-2026 850 RMK Pro 165; 2025-2026 Patriot 9R RMK Khaos 155 LE; 2025-2026 Patriot 9R RMK Pro 155; 2025-2026 Patriot 9R RMK Pro 165; 2025-2026 Patriot Boost RMK Khaos 165; 2025-2026 Patriot Boost RMK Pro 155; 2025-2026 Patriot Boost RMK Pro 165; 2026 Patriot Boost RMK Khaos 155 LE
Features
- Separate low-speed and high-speed compression clickers: 8-click low-speed and 3-click high-speed compression adjustment (per Len Performance).
- 8-click rebound adjustment.
- 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.
- Powder-coated spring resists corrosion and holds rate in cold, wet conditions.
- Threaded shock body with anodized dual-ring locking preload adjusters: set sag once and it stays set.
- Sold each.
Specifications
| Part number | 54-50004 (Len Performance LS8-50004) |
| OEM part number replaced | 7045529 (per distributor listings) |
| Shock location | Ski (front suspension), fits left or right |
| Chassis / platform | Polaris AXYS / Matryx |
| Adjustments | Compression (8 low-speed / 3 high-speed) and rebound (8), plus threaded spring preload |
| Length, extended | 406 mm / 15.99 in |
| Length, compressed | 269 mm / 10.6 in |
| Stroke | 137 mm / 5.39 in |
| Spring | Powder-coated coil spring included, 63 mm / 2.49 in diameter |
| Top eyelet | 17.8 mm ID x 29.5 mm wide (0.71 in x 1.17 in) |
| Bottom eyelet | 12.5 mm ID x 17.8 mm wide (0.5 in x 0.71 in) |
| Weight | 3.85 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.