FOX Factory Series S/D Renegade Track Kit 129 in QS3 Rear Track Shock, Part 853-04-001

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 S/D Renegade Track Kit 129 in rear track shock is designed for select 2021–2023 Ski-Doo MX Z snowmobiles with a 129-inch track. Part number 853-04-001 delivers refined suspension performance with a lightweight, fully rebuildable and revalveable design. The updated MY26 styling combines black Type III anodized shock bodies with orange reservoir caps for a clean, purpose-built appearance.

FOX Rifle-Bore shock bodies use internal spiral grooves to control oil flow around the main piston. This position-sensitive damping design reduces damping force through the ride zone for a smoother, more compliant feel, while the grooves end during the final 30% of travel to direct oil through the piston and increase bottom-out resistance during hard impacts. The optimized design includes a lighter piston and shaft, weight-optimized body caps, aluminum and injection-molded polymer mounting hardware, an optimized reservoir, a double-digressive aluminum piston, a high-pitch spring, and a high-volume bearing.

Adjustability comes from the QS3 three-position compression adjustment, allowing riders to select settings for varied trail and riding conditions. The QSE electronic lockout function is available on select models and allows the rear track shock to be locked out using a handlebar-mounted switch. This FOX shock fits 2021–2023 Ski-Doo MX Z X and MX Z X-RS models equipped with the 600R E-TEC or 850 E-TEC engine and a 129-inch track with a 1.25-inch lug profile. Verify vehicle configuration before installation.

Features:

• Lightweight Factory Series design with a 60% lighter piston and 20% lighter shaft
• Rifle-Bore shock body provides position-sensitive damping for a plush ride zone and improved bottom-out resistance
• QS3 three-position compression adjustment
• QSE electronic rear track lockout available on select models through a handlebar-mounted switch
• Fully rebuildable and revalveable construction
• Double-digressive aluminum piston for controlled suspension performance
• High-pitch spring design and high-volume bearing
• Optimized reservoir length and weight-optimized body caps
• Aluminum and injection-molded polymer mounting hardware
• Black Type III anodized shock body with orange reservoir caps
• Fits select 2021–2023 Ski-Doo MX Z X and MX Z X-RS models with 129-inch tracks and 1.25-inch lugs
• Brand: FOX
• Manufacturer Part Number: 853-04-001
• Vendor Part Number: 853-04-001

Fitment:
2021 Ski-Doo MX Z X 600R E-TEC 129"/1.25"
2021 Ski-Doo MX Z X 850 E-TEC 129"/1.25"
2021 Ski-Doo MX Z X-RS 600R E-TEC 129"/1.25"
2021 Ski-Doo MX Z X-RS 850 E-TEC 129"/1.25"
2022 Ski-Doo MX Z X 600R E-TEC 129"/1.25"
2022 Ski-Doo MX Z X 850 E-TEC 129"/1.25"
2022 Ski-Doo MX Z X-RS 600R E-TEC 129"/1.25"
2022 Ski-Doo MX Z X-RS 850 E-TEC 129"/1.25"
2023 Ski-Doo MX Z X-RS 600R E-TEC 129"/1.25"
2023 Ski-Doo MX Z X-RS 850 E-TEC 129"/1.25"
2024 Ski-Doo MX Z Adrenaline 600R E-TEC 129"
2024 Ski-Doo MX Z Adrenaline 600R E-TEC 137"
2024 Ski-Doo MX Z Adrenaline 600R E-TEC w/ Blizzard Package 129"
2024 Ski-Doo MX Z Adrenaline 600R E-TEC w/ Blizzard Package 137"
2024 Ski-Doo MX Z Adrenaline 850 E-TEC 129"
2024 Ski-Doo MX Z Adrenaline 850 E-TEC 137"
2024 Ski-Doo MX Z Adrenaline 850 E-TEC w/ Blizzard Package 129"
2024 Ski-Doo MX Z Adrenaline 850 E-TEC w/ Blizzard Package 137"
2024 Ski-Doo MX Z X 600R E-TEC 129"/1.25"
2024 Ski-Doo MX Z X 600R E-TEC 129"/1.5"
2024 Ski-Doo MX Z X 600R E-TEC 137"/1.25"
2024 Ski-Doo MX Z X 600R E-TEC 137"/1.5"
2024 Ski-Doo MX Z X 850 E-TEC 129"/1.25"
2024 Ski-Doo MX Z X 850 E-TEC 129"/1.5"
2024 Ski-Doo MX Z X 850 E-TEC 137"/1.25"
2024 Ski-Doo MX Z X 850 E-TEC 137"/1.5"
2024 Ski-Doo MX Z X-RS 600R E-TEC 129"/1.25"
2024 Ski-Doo MX Z X-RS 600R E-TEC 129"/1.5"
2024 Ski-Doo MX Z X-RS 600R E-TEC 137"/1.25"
2024 Ski-Doo MX Z X-RS 600R E-TEC 137"/1.5"
2024 Ski-Doo MX Z X-RS 600R E-TEC w/ Competition Package
2024 Ski-Doo MX Z X-RS 850 E-TEC 129"/1.25"
2024 Ski-Doo MX Z X-RS 850 E-TEC 129"/1.5"
2024 Ski-Doo MX Z X-RS 850 E-TEC 137"/1.25"
2024 Ski-Doo MX Z X-RS 850 E-TEC 137"/1.5"
2024 Ski-Doo MX Z X-RS 850 E-TEC Turbo R w/ Competition Package
2025 Ski-Doo MX Z Adrenaline 600R E-TEC 129"
2025 Ski-Doo MX Z Adrenaline 600R E-TEC w/ Blizzard Package 129"
2025 Ski-Doo MX Z Adrenaline 850 E-TEC 129"
2025 Ski-Doo MX Z Adrenaline 850 E-TEC w/ Blizzard Package 129"
2025 Ski-Doo MX Z X 600R E-TEC 129"/1.25"
2025 Ski-Doo MX Z X 600R E-TEC 129"/1.5"
2025 Ski-Doo MX Z X 850 E-TEC 129"/1.25"
2025 Ski-Doo MX Z X 850 E-TEC 129"/1.5"
2025 Ski-Doo MX Z X-RS 600R E-TEC 129"/1.25"
2025 Ski-Doo MX Z X-RS 600R E-TEC 129"/1.5"
2025 Ski-Doo MX Z X-RS 600R E-TEC w/ Competition Package
2025 Ski-Doo MX Z X-RS 850 E-TEC 129"/1.25"
2025 Ski-Doo MX Z X-RS 850 E-TEC 129"/1.5"
2025 Ski-Doo MX Z X-RS 850 E-TEC Turbo R w/ Competition Package
2026 Ski-Doo MX Z Adrenaline 600R E-TEC 129"
2026 Ski-Doo MX Z Adrenaline 600R E-TEC w/ Blizzard Package 129"
2026 Ski-Doo MX Z Adrenaline 850 E-TEC 129"
2026 Ski-Doo MX Z X 600R E-TEC 129"/1.25"
2026 Ski-Doo MX Z X 850 E-TEC 129"/1.25"
2026 Ski-Doo MX Z X-RS 600R E-TEC 129"/1.25"
2026 Ski-Doo MX Z X-RS 600R E-TEC 129"/1.5"
2026 Ski-Doo MX Z X-RS 600R E-TEC w/ Competition Package
2026 Ski-Doo MX Z X-RS 850 E-TEC 129"/1.25"
2026 Ski-Doo MX Z X-RS 850 E-TEC 129"/1.5"
2026 Ski-Doo MX Z X-RS 850 E-TEC Turbo R w/ Competition Package