Spartan's K3 500 Chassis for the Newmar Mountain Aire (45')

Newmar Mountain Aire
(40' and 45') Riding on Spartan's K3 500 Chassis

View Newmar's Spartan Chassis Brochure Visit Newmar's Site

Detailed Chassis Specifications

Premium Chassis Features

  • Spartan’s Advanced Protection System
    • Automatic Traction Control
    • Adaptive Cruise Control
    • Spartan Safe Haul Tow Brake System
  • COMFORT DRIVE™ Steering Assist System W/Optional Variable Driver’s Effort Control Feature
  • SMART Steering Wheel with Leather/Wood Grain
  • Passive Steer Tag Axle
  • Electronic Ride Height Control Valves
  • Side Mounted Service Center
  • Self-Leveling System
  • 15,000 lb Towing Capacity Hitch
  • 5-Year/75,000 Mile Warranty
  • 20-Year Frame & Cross Member Warranty
  • No deductible, 24/7 Roadside Assistance for first 3 years of ownership


Engine +

Cummins ISX12

18 .7 CFM Air Compressor

1,500 Watt Block Heater

Peak Horsepower: 500 hp @ 1,800 rpm

Peak Torque

1,645 lb-ft @1,100 rpm

Transmission +

Allison 4000H

Chassis Ratings +

GVWR: 54,000 lb

Front GAWR: 20,000 lb

Rear GAWR: 20,000 lb

Tag GAWR: 14,000 lb

GCWR: 69,000 lb

Suspension +

Front: Independent front air suspension with 20,000 lb capacity

Rear: Non-torque reactive parallelogram air suspension with 23,000 lb capacity

Tag: Parallelogram air suspension and integrated passive steering tag axle with 14,000 lb capacity

Bilstein Shocks +

Front: 46mm

Rear: 46mm

Tag: 46mm

Brakes +

ABS: WABCO 6S/6M with Electronic Stability Control (ESC)

Front: Air Disc

Drive: Air Disc

Tag: Air Disc

Steering +

Leather Smart Wheel

Column: Manual TRW Tilt & Telescoping

Fuel System +

Fuel Tank: 150 gallon with dual side fill

DEF Tank: 15 gallon, dual side fill

Electrical System +

Custom Modular 12v Electrical System

Batteries: Two 950 CCA

Alternator: 210 amp

Cooling System +

Side-Mounted Radiator: Parallel Air Flow System with Low Profile Radiator

Frame +

Raised Rail Design for Frame Strength and Basement Storage

Tires +

Front: Michelin XZA 365/70R22.5 LRL

Rear: Michelin X Line Energy Z 315/80R22.5

LRL Tag: Michelin X Line Energy Z 315/80R22.5 LRL

Wheels +

(6) Aluminum wheels with Dura-bright finish and dress kit

(2) Steel wheels on inside dual wheels

Wheelbase +

270″ & 318″