Uploaded January 2025 | Updated September 2026, 9 hours ago

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This Ultra4 4900 class Polaris RZR is being purpose-built for the brutal terrain at King of the Hammers 2025. From CAD-designed suspension mounts and CNC-cut components to custom fabricated storage systems and Radflo suspension tuning, every detail of this car is designed around durability and performance.

The team also explains:

• why heim joints were chosen over bushings
• how caster and camber adjustability works
• RCV ball joint setup
• Radflo suspension integration
• and how the rear toolbox was engineered to carry spare axle shafts and tools during racing

Get more info about the build: wideopendesign.com/blogs/wideopenlife/polaris-rzr-tube-chassis-build-for-king-of-the-hammers-2025

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PRP SEATS
wideopendesign.com/collections/seats

OBOR TIRES
obor-tires.com/rocscraper

RACELINE WHEELS
https://racelinewheels.com/collection...

CUSTOM SPLICE RECOVERY GEAR:
customsplice.com

RADFLO SHOCKS:
wideopendesign.com/collections/radflo-shocks

EIBACH SPRINGS:
wideopendesign.com/collections/eibach-springs

RCV PERFORMANCE:
rcvperformance.com

WARN WINCH:
warn.com/90rc-winch-71550

FACTOR 55:
factor55.com

WIDE OPEN DESIGN:
wideopendesign.com

CRANE AXLE:
craneaxle.com

METALWERX SUSPENSION:
facebook.com/metalwerxmotorsport

SUPER ATV:
superatv.com

RUGGED RADIOS:
ruggedradios.com

FRAGOLA PERFORMANCE
fragolaperformancesystems.com

ULTRA 4 RACING
ultra4usa.com

NITRO RACING PARTS:
nitroracingparts.com

CRASH CITY SXS:
facebook.com/crashcitysxs

TRINITY RACING:
trinityracing.com
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B ROLL FOOTAGE CREDITS:
KING OF THE HAMMERS:
youtube.com/watch?v=qWzqJBhFPc8&t=7357s

BOOMBERG ORIGINALS:
youtube.com/watch?v=9Lv30Pw2jmQ&t=1061s

MONSTER ENERGY:
youtube.com/watch?v=618zQVocjEw&t=188s

HEAVY METAL CONCEPTS:
youtube.com/watch?v=Lyq9h33ZwwY

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#wideopenlife #KingOfTheHammers #PolarisRZR #Ultra4 #KOH2025 #RockRacing #TubeChassis #WideOpenDesign #RZRBuild #OffRoadRacing #PolarisRZRBuild

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Questions about your build? Sales@wideopendesign.com

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FOLLOW US
Wide Open Design:
wideopendesign.com
/ wideopendesign
/ wideopendesign

Crane Axle:
craneaxle.com
/ craneaxle
/ craneaxle

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⏰ Timecodes ⏰
0:00 KOH Qualifying
0:18 Dave Cole
1:21 RZR Front Suspension
4:10 Cad design and Cardboard
5:16 RZR rcv ball joint
6:26 RZR Front A Arms
7:48 Camber and Caster
8:40 Tube Chassis Gusset
9:19 HAAS Machine
10:38 HAAS Parts Catcher
11:12 Aluminum Tool Box
14:12 RZR CAD design
15:56 RZR tool box
16:40 rzr camber and caster
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