FOX Factory Series 1.5 Zero QS LRW Adjustable Rear Track Shock, Part Number 850-02-045

Completely redesigned and refined Factory Series Shocks are the lightest yet! Available in Coil and Float series with updated MY 26 styling. Rifle Bore have spiral grooves on the inside of the shock allowing oil to flow around the main piston reducing the damping force in the ride zone for a plush ride. The grooves end through the final 30% of the travel forcing the oil to flow through the main piston resulting in a significant increase in bottom-out resistance to cushion hard hit. QSE model rear track shocks include an electronic lock out mode with the simple click of a handlebar mounted button!

The FOX Factory Series 1.5 Zero QS LRW Adjustable Rear Track Shock is a high-performance suspension upgrade engineered for select Ski-Doo Summit snowmobiles. Model 850-02-045 features FOX Rifle-Bore technology, which uses internal spiral grooves to control oil flow around the main piston. This position-sensitive damping design helps deliver a plush ride through the initial portion of travel while increasing bottom-out resistance during harder impacts.

The redesigned Factory Series shock uses a lighter piston and shaft, an optimized reservoir, and weight-conscious body caps to reduce overall weight without sacrificing durability. Its double digressive aluminum piston, high-pitch spring design, and high-volume bearing support consistent suspension performance in demanding mountain terrain. The shock has a black Type III anodized body with orange reservoir caps and is fully rebuildable and revalveable for long-term serviceability and tuning flexibility.

Adjustability includes QS3 three-position compression control for quick trail or terrain changes. On applicable rear track configurations, the QSL lockout system provides additional control, while QSE-equipped models allow the rear track shock to be locked out using a handlebar-mounted switch. Aluminum and injection-molded poly mounting hardware are included as part of the optimized design. This FOX shock fits select 2017-2019 Ski-Doo Summit models, including Summit Burton 800R E-TEC, Summit SP 800R E-TEC, Summit SP 850 E-TEC, and Summit X 850 E-TEC applications with 146-inch and 154-inch tracks, including specified 3.0-inch configurations. Verify the exact model, year, track length, and suspension configuration before ordering.

Features:

• Fitment: Select 2017-2019 Ski-Doo Summit snowmobiles with 146-inch or 154-inch tracks, including specified 3.0-inch configurations
• Model: Factory Series 1.5 Zero QS LRW Adjustable Rear Track Shock
• Brand: FOX
• Manufacturer Part Number: 850-02-045
• Rifle-Bore Bodies: Position-sensitive damping helps provide a plush ride and increased bottom-out resistance
• Weight Optimization: Features a 60% lighter piston, 20% lighter shaft, smaller overall size, and optimized reservoir length
• Adjustability: QS3 three-position compression adjustment supports quick suspension tuning
• Lockout: QSL lockout system is available on rear track applications, with QSE handlebar-switch compatibility on select models
• Construction: Includes a double digressive aluminum piston, high-pitch spring design, and high-volume bearing
• Mounting Hardware: Uses aluminum and injection-molded poly mounting hardware
• Serviceability: Fully rebuildable and revalveable for long-term maintenance and custom tuning
• Finish: Black Type III anodized body with orange reservoir caps

Fitment:
2017 Ski-Doo Summit Burton 800R E-TEC 154"
2017 Ski-Doo Summit SP 800R E-TEC 146"
2017 Ski-Doo Summit SP 800R E-TEC 154"
2017 Ski-Doo Summit SP 850 E-TEC 154"
2017 Ski-Doo Summit SP 850 E-TEC 165"
2017 Ski-Doo Summit X 850 E-TEC 154"/3.0"
2017 Ski-Doo Summit X 850 E-TEC 165"/2.5"
2017 Ski-Doo Summit X 850 E-TEC 165"/3.0"
2018 Ski-Doo Summit SP 850 E-TEC 146"
2018 Ski-Doo Summit SP 850 E-TEC 154"
2018 Ski-Doo Summit SP 850 E-TEC 165"
2018 Ski-Doo Summit X 850 E-TEC 154"/3.0"
2018 Ski-Doo Summit X 850 E-TEC 165"/2.5"
2018 Ski-Doo Summit X 850 E-TEC 165"/3.0"
2019 Ski-Doo Summit SP 850 E-TEC 146"
2019 Ski-Doo Summit SP 850 E-TEC 154"
2019 Ski-Doo Summit SP 850 E-TEC 165"
2019 Ski-Doo Summit X 850 E-TEC 154"/3.0"
2019 Ski-Doo Summit X 850 E-TEC 165"/2.5"
2019 Ski-Doo Summit X 850 E-TEC 165"/3.0"
2020 Ski-Doo Summit SP 850 E-TEC 146"
2020 Ski-Doo Summit SP 850 E-TEC 154"
2020 Ski-Doo Summit SP 850 E-TEC 165"
2020 Ski-Doo Summit X 850 E-TEC 154"/3.0"
2020 Ski-Doo Summit X 850 E-TEC 165"/2.5"
2020 Ski-Doo Summit X 850 E-TEC 165"/3.0"
2020 Ski-Doo Summit X 850 with Expert Package E-TEC 154"/3.0"
2020 Ski-Doo Summit X 850 with Expert Package E-TEC 165"/3.0"
2021 Ski-Doo Summit SP 850 E-TEC 146"
2021 Ski-Doo Summit SP 850 E-TEC 154"
2021 Ski-Doo Summit SP 850 E-TEC 165"
2021 Ski-Doo Summit X 850 E-TEC 154"/3.0"
2021 Ski-Doo Summit X 850 E-TEC 165"/2.5"
2021 Ski-Doo Summit X 850 E-TEC 165"/3.0"
2021 Ski-Doo Summit X 850 E-TEC Turbo 154"
2021 Ski-Doo Summit X 850 with Expert Package E-TEC 154"/3.0"
2021 Ski-Doo Summit X 850 with Expert Package E-TEC 165"/3.0"
2021 Ski-Doo Summit X 850 with Expert Package E-TEC 175"
2021 Ski-Doo Summit X 850 with Expert Package E-TEC Turbo 154"
2021 Ski-Doo Summit X 850 with Expert Package E-TEC Turbo 165"
2021 Ski-Doo Summit X 850 with Expert Package E-TEC Turbo 175"
2022 Lynx Boondocker 850 E-TEC DS 3900
2022 Lynx Boondocker 850 E-TEC DS 4100
2022 Ski-Doo Summit SP 850 E-TEC 146"
2022 Ski-Doo Summit SP 850 E-TEC 154"
2022 Ski-Doo Summit SP 850 E-TEC 165"
2022 Ski-Doo Summit X 850 E-TEC 154"/3.0"
2022 Ski-Doo Summit X 850 E-TEC 165"/2.5"
2022 Ski-Doo Summit X 850 E-TEC 165"/3.0"
2022 Ski-Doo Summit X 850 E-TEC Turbo 154"
2022 Ski-Doo Summit X 850 with Expert Package E-TEC 154"/2.5"
2022 Ski-Doo Summit X 850 with Expert Package E-TEC 154"/3.0"
2022 Ski-Doo Summit X 850 with Expert Package E-TEC 165"/3.0"
2022 Ski-Doo Summit X 850 with Expert Package E-TEC Turbo 154"
2022 Ski-Doo Summit X 850 with Expert Package E-TEC Turbo 165"
2022 Ski-Doo Summit X 850 with Expert Package E-TEC Turbo 175"
2023 Lynx Shredder DS-850 E-TEC 154"
2023 Lynx Shredder DS-850 E-TEC Turbo R 154"/3.0"
2023 Lynx Shredder DS-850 E-TEC Turbo R 165"
2023 Lynx Shredder RE-850 E-TEC Turbo R 154"
2023 Ski-Doo Freeride 850 E-TEC 146"
2023 Ski-Doo Freeride 850 E-TEC 154" Turbo
2023 Ski-Doo Freeride 850 E-TEC 154"/2.5"
2023 Ski-Doo Freeride 850 E-TEC 165"
2023 Ski-Doo Freeride 850 E-TEC 165" Turbo
2023 Ski-Doo Freeride 850 E-TEC Turbo R 146"
2023 Ski-Doo Freeride 850 E-TEC Turbo R 154"
2023 Ski-Doo Summit Edge 850 E-TEC 154" 2.5
2023 Ski-Doo Summit Edge 850 E-TEC 165"
2023 Ski-Doo Summit Edge 850 E-TEC 175"
2023 Ski-Doo Summit Neo 600 EFI 146"
2023 Ski-Doo Summit Neo+ 600 EFI 146"
2023 Ski-Doo Summit SP 850 E-TEC 146"
2023 Ski-Doo Summit SP 850 E-TEC 154"
2023 Ski-Doo Summit SP 850 E-TEC 165"
2023 Ski-Doo Summit X 850 E-TEC 154"/3.0"
2023 Ski-Doo Summit X 850 E-TEC 165"/2.5"
2023 Ski-Doo Summit X 850 E-TEC 165"/3.0"
2023 Ski-Doo Summit X 850 E-TEC Turbo R 154"/3.0"
2023 Ski-Doo Summit X 850 E-TEC Turbo R 165"/3.0"
2023 Ski-Doo Summit X 850 with Expert Package E-TEC 154"/3.0"
2023 Ski-Doo Summit X 850 with Expert Package E-TEC 165"/3.0"
2023 Ski-Doo Summit X 850 with Expert Package E-TEC Turbo R 154"/3.0"
2023 Ski-Doo Summit X 850 with Expert Package E-TEC Turbo R 165"/3.0"
2023 Ski-Doo Summit X 850 with Expert Package E-TEC Turbo R 175"
2024 Lynx Shredder DS-850 E-TEC Turbo R 154"/3.0"
2024 Lynx Shredder DS-850 E-TEC Turbo R 165"
2024 Lynx Shredder RE-850 E-TEC 146"
2024 Lynx Shredder RE-850 E-TEC 154"/3.0"
2024 Lynx Shredder RE-850 E-TEC Turbo R 146"
2024 Lynx Shredder RE-850 E-TEC Turbo R 154"
2024 Ski-Doo Freeride 850 E-TEC 146"
2024 Ski-Doo Freeride 850 E-TEC 154"/3.0"
2024 Ski-Doo Summit Neo 600 EFI 146"
2024 Ski-Doo Summit Neo+ 600 EFI 146"
2024 Ski-Doo Summit X 850 E-TEC 154"/3.0"
2024 Ski-Doo Summit X 850 E-TEC 165"/2.5"
2024 Ski-Doo Summit X 850 E-TEC 165"/3.0"
2024 Ski-Doo Summit X 850 E-TEC Turbo R 154"/2.5"
2024 Ski-Doo Summit X 850 E-TEC Turbo R 154"/3.0"
2024 Ski-Doo Summit X 850 E-TEC Turbo R 165"/3.0"
2024 Ski-Doo Summit X 850 with Expert Package E-TEC 154"/3.0"
2024 Ski-Doo Summit X 850 with Expert Package E-TEC 165"/3.0"
2024 Ski-Doo Summit X 850 with Expert Package E-TEC Turbo R 154"/3.0"
2024 Ski-Doo Summit X 850 with Expert Package E-TEC Turbo R 165"/3.0"
2024 Ski-Doo Summit X 850 with Expert Package E-TEC Turbo R 175"
2025 Lynx Shredder DS-850 E-TEC 154"
2025 Lynx Shredder DS-850 E-TEC Turbo R 154"/3.0"
2025 Lynx Shredder DS-850 E-TEC Turbo R 165"
2025 Lynx Shredder RE-850 E-TEC 146"
2025 Lynx Shredder RE-850 E-TEC 154"/3.0"
2025 Lynx Shredder RE-850 E-TEC Turbo R 146"
2025 Lynx Shredder RE-850 E-TEC Turbo R 154"
2025 Ski-Doo Freeride 850 E-TEC 146"
2025 Ski-Doo Freeride 850 E-TEC 154"/2.5"
2025 Ski-Doo Freeride 850 E-TEC 154"/3.0"
2025 Ski-Doo Freeride 850 E-TEC 165"
2025 Ski-Doo Summit X 850 E-TEC 154"/2.5"
2025 Ski-Doo Summit X 850 E-TEC 154"/3.0"
2025 Ski-Doo Summit X 850 E-TEC 165"/2.5"
2025 Ski-Doo Summit X 850 E-TEC 165"/3.0"
2025 Ski-Doo Summit X 850 E-TEC Turbo R 154"/3.0"
2025 Ski-Doo Summit X 850 E-TEC Turbo R 165"/2.5"
2025 Ski-Doo Summit X 850 E-TEC Turbo R 165"/3.0"
2025 Ski-Doo Summit X 850 with Expert Package E-TEC 154"/2.5"
2025 Ski-Doo Summit X 850 with Expert Package E-TEC 154"/3.0"
2025 Ski-Doo Summit X 850 with Expert Package E-TEC 165"/2.5"
2025 Ski-Doo Summit X 850 with Expert Package E-TEC 165"/3.0"
2025 Ski-Doo Summit X 850 with Expert Package E-TEC Turbo R 154"/2.5"
2025 Ski-Doo Summit X 850 with Expert Package E-TEC Turbo R 154"/3.0"
2025 Ski-Doo Summit X 850 with Expert Package E-TEC Turbo R 165"/2.5"
2025 Ski-Doo Summit X 850 with Expert Package E-TEC Turbo R 165"/3.0"
2026 Lynx Shredder DS-850 E-TEC 154"
2026 Lynx Shredder DS-850 E-TEC Turbo R 154"/3.0"
2026 Lynx Shredder DS-850 E-TEC Turbo R 165"
2026 Lynx Shredder RE-850 E-TEC 146"
2026 Lynx Shredder RE-850 E-TEC 154"/3.0"
2026 Lynx Shredder RE-850 E-TEC Turbo R 146"
2026 Lynx Shredder RE-850 E-TEC Turbo R 154"
2026 Ski-Doo Freeride 850 E-TEC 146"
2026 Ski-Doo Freeride 850 E-TEC 154"/2.5"
2026 Ski-Doo Freeride 850 E-TEC 154"/3.0"
2026 Ski-Doo Summit X 850 E-TEC 154"/2.5"
2026 Ski-Doo Summit X 850 E-TEC 154"/3.0"
2026 Ski-Doo Summit X 850 E-TEC 165"/2.5"
2026 Ski-Doo Summit X 850 E-TEC 165"/3.0"
2026 Ski-Doo Summit X 850 E-TEC Turbo R 154"/3.0"
2026 Ski-Doo Summit X 850 E-TEC Turbo R 165"/3.0"