Len Performance Rear Track Shock, Polaris Switchback Pro-S / Adventure / ES & Rush 2012–2021 (54-50001R)
Len Performance Rear Track Shock, Polaris Switchback Pro-S / Adventure / ES & Rush 2012–2021 (54-50001R)
Len Performance
FREE ANCHORAGE PICKUP
Most orders are ready within 24 hours. Supplier-order exceptions are confirmed by email; freight to A2D is included in the product price. Need same-day pickup? Call 907-306-3062.
Shipping options and charges are shown at checkout. Shipping information.
CHECK YOUR FITMENT
Confirm your machine’s year, model, submodel, and the selected size or option before ordering. Need help? Contact the A2D team.
Product details
Len Performance LS4-50001R rebuildable rear track shock for the rear suspension on the 2012–2014 Pro-Ride Switchback 600 / 800 and ES, 2015–2021 AXYS Switchback 600 / 800 / 850 Pro-S and Adventure, and the 2017–2020 AXYS Rush 800 Pro-X and 600 / 800 / 850 Pro-S. It replaces the factory rear track shock with a coil-over reservoir shock. At $522.95 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 coil-over unit with its own 85 mm powder-coated spring, 5-click compression adjustment and a threaded body with locking preload rings, so the rear can be set for rider weight and trail conditions.
Fitment. Sold each. Pairs with the Len Performance 54-50000F front track shock for a complete rear suspension (Len Performance kit LS4-50001K). Matching ski shock: 54-50000. Chassis: Polaris Pro-Ride (2012–2014) and AXYS (2015–2021).
Fitment list (Len Performance year/model lookup)
- Switchback: 2012-2013 600 Switchback ES; 2012-2014 800 Switchback; 2012-2013 800 Switchback ES; 2013-2014 600 Switchback; 2015-2019 600 Switchback Adventure; 2015-2021 600 Switchback Pro-S; 2015-2020 800 Switchback Pro-S; 2016-2019 800 Switchback Adventure; 2019-2021 850 Switchback Pro-S
- Rush: 2017-2018 800 Rush Pro-X; 2019-2020 600 Rush Pro-S; 2019-2020 800 Rush Pro-S; 2019-2020 850 Rush Pro-S
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.
- 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 | 54-50001R (Len Performance LS4-50001R) |
| OEM part number replaced | 7044566 (per distributor listings) |
| Shock location | Rear track shock (rear suspension) |
| Chassis / platform | Polaris Pro-Ride / AXYS |
| Adjustments | Compression (5), plus threaded spring preload |
| Length, extended | 442 mm / 17.4 in |
| Length, compressed | 307 mm / 12.1 in |
| Stroke | 135 mm / 5.3 in |
| Spring | Powder-coated coil spring included, 85 mm / 3.3 in diameter |
| Top eyelet | 17.3 mm ID x 29.2 mm wide (0.7 in x 1.1 in) |
| Bottom eyelet | 17.8 mm ID x 29.3 mm wide (0.7 in x 1.2 in) |
| Weight | 6.10 lb (8 lb shipping) |
| Includes | One shock |
| Rebuild kit | 54-00003 (Len LSR-00003), per Dennis Kirk |
| 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.