RZR Pro R/Turbo R 300M HD Lower Ball Joint by ZBroz Racing

Replace the weakest link in your Polaris RZR Pro R, Turbo R, or Pro S suspension with the ZBroz 300M HD Lower Ball Joint. Built from 300M alloy steel — the same ultra-high-strength material used in aerospace landing gear and military hardware — this lower ball joint is engineered for the heavy loads, big hits, and aggressive driving the new Pro-platform machines invite.

Factory lower ball joints are a known failure point on hard-driven Pro R/Turbo R/Pro S builds. The 300M material upgrade pushes ultimate tensile strength well past what stock components can handle, while the heat-treated stud and hardened housing extend service life through season after season of abuse.

Key Features

• 300M Alloy Steel Construction — aerospace-grade ultra-high-strength material
• Heat-Treated Ball Stud — surface-hardened for wear resistance under load
• Engineered for Pro R/Turbo R/Pro S Platform — not a generic upgrade
• Direct OEM Fit — drops into factory lower A-arms, no modifications
• Greaseable Sealed Design — keeps grit out, extends service life
• Engineered and Manufactured in the USA by ZBroz Racing

Specifications

• Heavy-duty lower ball joint (single unit — order quantity per A-arm needed)
• 300M alloy steel construction
• Heat-treated and surface-hardened ball stud
• Direct OEM replacement — no modifications required
• Sealed greaseable design
• Designed and manufactured by ZBroz Racing in the USA

Fitment

• Polaris RZR Pro R, Pro R 4
• Polaris RZR Turbo R, Turbo R 4
• Polaris RZR Pro S
• Direct fit on factory lower A-arms
• Not compatible with XP 1000, XP Turbo, Pro XP, or earlier RZR platforms

FAQ

What is 300M and why does it matter?

300M is an ultra-high-strength low-alloy steel originally developed for aerospace landing gear, military aircraft, and high-stress hardware. Its ultimate tensile strength substantially exceeds standard 4340 or chromoly steels, making it the right choice for a load-bearing suspension component that sees real abuse.

Will this fit my XP 1000 or Pro XP?

No. This ball joint is engineered specifically for the Pro R, Turbo R, and Pro S platform. Earlier RZR platforms use different lower ball joint specs — ZBroz makes the K37-4875-0 reverse-load upper for those vehicles.

Is this a single ball joint or a set?

Each unit is a single lower ball joint. Most Pro R/Turbo R applications need two lower ball joints (one per A-arm side) — verify your needs and order accordingly.

Will it work with aftermarket A-arms?

Yes for most aftermarket A-arms that retain the factory Pro R/Turbo R ball joint pocket dimensions. Verify with your A-arm manufacturer if uncertain.

Is installation DIY-friendly?

Yes — plan 1-2 hours per side with a ball joint press or a quality ball joint service tool. Detailed instructions are included.

Why ZBroz

ZBroz's racing program runs the Pro-platform RZRs in real desert competition where factory lower ball joints fail with regularity. The 300M material upgrade reflects what works on race trucks — same metallurgy, same heat-treat process, available as a direct OEM replacement.

CTA

Stop wondering when the factory lower ball joint will let go. Upgrade to the ZBroz 300M HD Lower Ball Joint and put the strongest material on the most stressed component. Order from Dunes 2 Dezert SXS.