Mega Keller ball joints are for RZR Pro XP builds that have already outgrown the strong ones. The housing and stud are oversized well past a standard joint, using the same two-piece threaded design that removes the snap ring entirely. They are large enough that your A-arms must be modified to accept them — that is the trade you make for the strength.
If your Pro XP is not running portals, very large tires, or race-level abuse, the standard Keller joint bolts straight in and solves the same problem.
Key Features
- Oversized housing and enlarged 4340 hardened chromoly stud
- Two-piece threaded design eliminates the OEM snap ring
- Adjustable, greaseable and rebuildable
- Requires modification of your A-arms to fit
- Sold as one, two, or a set of four
- Backed by a lifetime warranty
- Made in USA
Built To Solve: Repeat Ball Joint Failure on Heavily Built RZR Pro XPs
- Standard joints that keep failing on a Pro XP running portals or 32-inch-plus tires
- Snap ring separation under race or dune landing loads
- Studs bending or breaking rather than the housing letting go
- Front ends rebuilt every season that still do not last a season
- Builds where the A-arms are being modified or replaced anyway
Best For: Portal-Equipped, Big-Tire and Race-Prepped RZR Pro XP Builds
- Pro XP and Pro XP 4 owners on portal gears carrying significantly more unsprung weight
- Dune and desert riders landing hard and often
- Rock crawlers loading the front end at full articulation
- Racers who rebuild a front end on a schedule
- Experienced installers, or riders willing to pay for professional installation
This is not the joint for a stock or lightly modified Pro XP. The standard Keller ball joint fits without touching your A-arms and removes the same snap ring failure point.
Specifications
- Material: 4340 hardened chromoly steel stud with an oversized housing
- Design: oversized two-piece threaded housing, no snap ring
- Serviceability: adjustable, greaseable and rebuildable
- A-arm modification: required
- Sold as: 1 ball joint, 2 ball joints, or 4 ball joints
- Warranty: lifetime
- Manufacturer Part Number: BJKM-P-MTSPR#PR (one joint), BJKM-P-MTSPR-K-2#PR (two joints), BJKM-P-MTSPR-K-4#PR (four joints)
Fitment
- Polaris RZR Pro XP: 2020 onward
- Polaris RZR Pro XP 4: 2020 onward
Mega ball joints require modification of your A-arms. Both the two-seat and four-seat Pro XP are covered from 2020 onward. Fitment is not guaranteed on applications not listed above.
FAQ
Do Mega Keller ball joints really require A-arm modification?
Yes, and it is not optional — SuperATV states it on the product itself. The housing is deliberately larger to make room for a bigger ball and stud, so the A-arm has to be machined to accept it. If that is not on the table, buy the standard Keller joint.
What do I gain over the standard Keller joint?
Size. Both use the same two-piece threaded principle and both delete the snap ring. The Mega adds a larger housing and a thicker chromoly stud, which matters once the housing is no longer the weak point but the stud still is.
Do these fit the four-seat Pro XP 4?
Yes, from 2020 onward, provided the A-arms are modified to accept the Mega housing.
How many should I buy?
Most riders modifying A-arms do the complete front end at once, which is the set of four. Singles and pairs exist for replacing a specific failure.
Are they still greaseable and rebuildable?
Yes. Being the strongest option does not make them disposable — they grease, adjust and rebuild like the standard joints, and the Keller rebuild kit for Polaris covers them.
Should I run Mega joints on a mostly stock Pro XP?
Probably not. Without portals, very large tires or racing, you are paying for strength and install work you will not use. The standard Keller joint already removes the snap ring failure point.
Why Keller
Todd Keller's two-piece threaded design fixed the snap ring problem, and the Mega is that idea taken as far as it goes. SuperATV builds and backs the line. Nothing here is disposable — the joints grease, adjust and rebuild, so a hard season means a service rather than a new set.
Finish Your Heavy-Duty RZR Pro XP Front End
Before ordering, confirm two things: your model year is 2020 or later, and your A-arms are modified or will be. If they are not, order the standard Keller joint instead. Riders going this route are usually replacing A-arms at the same time, and the Keller rebuild kit for Polaris services these joints when they eventually need attention rather than replacement.
Installation Video
Official SuperATV installation walkthrough with Todd Keller: How To Install Keller Ball Joints
