The FOX Ski Float 3 Evol QS LWR Adjustable Shock is a lightweight, fully rebuildable and revalveable suspension upgrade designed for select Ski-Doo Summit snowmobiles. Part number 850-21-268 features FOX Factory Race Series performance, refined MY26 styling, and multiple adjustment options for tuning ride comfort and handling across changing trail, mountain, and riding conditions.
The Float 3 Evol QS platform uses a 60% lighter piston and 20% lighter shaft to reduce unsprung weight while maintaining responsive suspension performance. Its rifle-bore body supports position-sensitive damping, while the double-digressive aluminum piston, high-pitch spring design, and high-volume bearing help deliver controlled movement through varied terrain. Aluminum and injection-polymer mounting hardware, an optimized reservoir length, and newly weight-optimized body caps contribute to the compact, updated design.
QS3 provides three-position compression adjustment for quick tuning between riding conditions. The QSL configuration adds a rear track shock lockout function on compatible models, allowing the rider to firm the rear suspension when needed. This FOX shock is finished with orange reservoir caps and black Type III anodized bodies for a durable, professional appearance.
Fitment includes 2017 Ski-Doo Summit Burton 800R E-TEC 154-inch, 2017 Summit SP 800R E-TEC 146-inch, 2017 Summit SP 800R E-TEC 154-inch, 2017 Summit X 850 E-TEC 154-inch with 3.0-inch track, 2017 Summit SP 850 E-TEC 154-inch, 2018 Summit SP 850 E-TEC 146-inch and 154-inch, 2018 Summit X 850 E-TEC 154-inch with 3.0-inch track, and 2019 Summit SP and Summit X 850 E-TEC models with 146-inch and 154-inch tracks, as applicable. Verify the exact model and suspension position before installation.
Features:
- Brand: FOX Factory Race Series
- Manufacturer Part Number: 850-21-268
- Vendor Part Number: 530-1262
- Application: Select Ski-Doo Summit snowmobiles
- Adjustment: QS3 three-position compression adjustment
- Lockout: QSL rear track shock lockout for select compatible models
- Construction: 60% lighter piston and 20% lighter shaft
- Damping: Rifle-bore body with position-sensitive damping
- Piston: Double-digressive aluminum piston
- Spring: High-pitch spring design
- Serviceability: Fully rebuildable and revalveable
- Hardware: Aluminum and injection-polymer mounting hardware
- Finish: Orange reservoir caps with black Type III anodized bodies
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"