This is the strongest ball joint Keller makes for the 2024-and-newer RZR XP, and it will not fit a stock A-arm. The Mega uses a substantially larger housing and stud than the standard Keller joint — so much larger that the A-arm has to be machined to accept it. That is the trade: more material in the part that keeps failing, in exchange for a modification you cannot undo.
Read this before ordering: Mega ball joints require modification of your A-arms. If your arms are stock and you do not intend to have them machined, the standard Keller RZR XP joint threads straight in and is the correct part for you.
Key Features
- Oversized housing and stud — significantly more material than the standard Keller joint
- Two-piece threaded design, no OEM snap ring
- 4340 hardened chromoly steel housings and studs
- Adjustable, greaseable and rebuildable
- One joint serves both upper and lower positions on this platform
- Requires machined A-arms — not a bolt-in upgrade
- Limited lifetime warranty against manufacturing defects
- Made in USA
Built To Solve: Repeat Ball Joint Failure On A Hard-Ridden RZR XP
- Standard-size joints that keep failing on a car making serious power
- Snap ring shearing and letting the joint separate from the A-arm
- Clunking or knocking from the front end over rough ground and whoops
- Play in the wheel when rocked top-to-bottom on a jack
- Long-travel and big-tire builds that outgrow a stock-size joint
- Riders who have already fitted heavy-duty joints and broken those too
Best For: Built RZR XP Cars With Modified A-Arms
- 2024-and-newer RZR XP and XP 4 owners already running aftermarket or machined arms
- Long-travel builds where the front end sees loads a stock-size joint was never designed for
- Desert and dune riders landing hard and often
- Racers and hard chargers who treat joints as a consumable
- Anyone having A-arms machined anyway and wanting the strongest joint available while it is apart
If your A-arms are stock, order the standard Keller RZR XP ball joints instead — same design principle, no machining required.
Specifications
- Material: 4340 hardened chromoly steel, stud and housing
- Design: two-piece threaded housing, no snap ring
- Housing: oversized Mega, larger than the standard Keller joint
- Serviceability: adjustable, greaseable and rebuildable
- A-arm modification: REQUIRED
- Positions: one joint serves both upper and lower on this platform
- Warranty: limited lifetime against manufacturing defects, original purchaser
- Manufacturer Part Number: BJKM-P-MXP1KT#XP (one joint), BJKM-P-MXP1KT-K-2#XP (two joints), BJKM-P-MXP1KT-K-4#XP (four joints)
Fitment
- Polaris RZR XP: 2024 onward
- Polaris RZR XP 4: 2024 onward
NOTE: Mega ball joints require modification of your A-arms. This is the current-generation RZR XP, not the 2014-2023 XP 1000 — that machine has its own Mega listing. Fitment is not guaranteed on applications not listed above.
FAQ
What actually has to be modified on the A-arm?
The Mega housing is larger than the bore a factory arm provides, so the arm has to be machined to accept it. This is permanent — an arm cut for a Mega will not go back to a standard joint. Have it done by a shop that has cut arms for these before.
Should I buy the Mega or the standard Keller joint?
If your A-arms are stock and staying stock, buy the standard — it threads in as supplied and solves the snap-ring failure just as completely. The Mega is for cars already running machined or aftermarket arms, or builds where the standard joint has failed under load.
Is this for the new RZR XP or the older XP 1000?
This is the current RZR XP, 2024 and newer. The 2014-2023 XP 1000 has its own Mega listing.
Do I need different joints for the upper and lower positions?
No. On this platform the same Mega joint serves both positions, so choose one, two, or a set of four for a complete front end.
Can these be rebuilt?
Yes. They grease and adjust, and the Keller ball joint rebuild kit for Polaris carries a Mega-specific option — make sure you order the Mega service parts, not the standard ones.
Do these fit the four-seat RZR XP 4?
Yes. Both the RZR XP and the XP 4 are covered from 2024 onward.
Why Keller
Todd Keller designed the two-piece threaded ball joint to fix the one part of a stock front end that keeps failing, and SuperATV now builds and backs the line. The Mega is what happens when that design is taken as far as the geometry allows: the same threaded housing and chromoly stud, scaled up past the point a factory A-arm can accept.
Before You Order
Confirm your A-arms are machined for Mega housings, or that you are having that done. If they are stock, the standard Keller RZR XP joint is the right part. If the boots are torn but the joints are sound, the Keller boot replacement kit covers the Mega. If the joints are worn but the housings are good, the Mega option in the Keller rebuild kit for Polaris services them.
Installation Video
Official SuperATV installation walkthrough with Todd Keller: How To Install Keller Ball Joints
