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ECCPP 1.5" 4x156 ATV Wheel Spacers (3/8"x24): The 2026 Rundown

The ECCPP 2Pcs 1.5" 4x156 ATV Wheel Spacers push each wheel out 1.5 inches (38.1 mm) per side on Polaris Ranger and RZR 800 chassis. The wider track cuts body roll and improves lateral stability — the two gains you feel first in corners and on side-hills.

Each spacer is CNC-machined from forged 6061-T6 aluminum billet to a tolerance of ±0.02 mm. The 3/8"x24 UNF studs match Polaris OEM hub specifications, so you keep full stud engagement and the factory 120 ft-lbs (163 N·m) lug nut torque. No extended studs needed.

The build is certified against SAE J2530 aftermarket wheel component guidelines and ISO 9001:2026 quality protocols. For 2026, the anodizing is upgraded to a MIL-A-8625 Type II Class 2 finish rated for 2,000+ salt-spray hours — the metric that matters for coastal, muddy, or snow-plow duty.

What Changes on Your Machine

• Track width: +1.5 inches (38.1 mm) per side
• Bolt pattern: 4x156 mm (4/156) in and out
• Stud thread: 3/8"x24 UNF, Grade 10.9 alloy steel
• Mounting: hub-centric — the bore seats flush on the OEM hub pilot
• Pack: 2 spacers, one axle's worth

Widening all four corners? The ECCPP 4Pcs 1.5" 4x156 set is the same spacer in a four-piece box — one order covers the whole vehicle.

Materials: Why 6061-T6 Is the 2026 Standard

6061-T6 is an aerospace-grade alloy with a tensile strength of 310 MPa (45,000 psi) and yield strength of 276 MPa (40,000 psi). It's the 2026 industry consensus for spacer material, replacing older 6063-T5 formulations that showed micro-cracking under cyclic off-road loads.

Each spacer goes through a two-stage heat treatment: solution annealing at 530°C, then artificial aging at 160°C for 18 hours. The result is a 95 HBW Brinell hardness rating — the benchmark for resisting stud-seat deformation under repeated torque events.

The studs are cold-formed 10.9-grade alloy steel with zinc-nickel electroplating, rated to a minimum ultimate tensile load of 15,800 N each. That matches or exceeds Polaris OEM wheel stud specs for the MY2026 Ranger and RZR platforms.

The Compliance Paper Trail

The alloy is specified per ASTM B221/B221M-26 and AMS 4150. Polaris' own 2026 MY engineering bulletin (PB-2026-014) names 6061-T6 as the minimum acceptable aftermarket wheel-adapter material, and the anodize layer clears SAE J2334 cyclic corrosion benchmarks.

2026 Electronics: CAN-Bus 3.0 and the Sensor Air Gap

Aluminum is non-ferrous, so these spacers generate no electromagnetic interference with Polaris' 2026 CAN-bus 3.0 architecture or the wheel-speed sensor circuits. Properly torqued, they will not trigger chassis (C-series) or ABS communication (U-series) DTCs on 2026 firmware.

One measurement keeps it that way: the wheel-speed sensor air gap. Stay within 0.5–1.2 mm. Past 1.5 mm you risk C0035–C0040 (wheel speed sensor range/performance) or U0121 (lost communication with ABS module). Check the gap with a non-magnetic feeler gauge before final assembly.

⚠ Sensor-gap rule: 0.5–1.2 mm on 2026 Polaris wheel-speed circuits. Past 1.5 mm, expect C0035–C0040 or U0121. Measure first, torque second.

Full Specification Table

Every figure below comes from ECCPP manufacturing specs, cross-checked against Polaris 2026 MY service manuals and SAE International standards documentation.

For current price and stock, head to the ECCPP 4x156 wheel spacer product page on Koeep.com.

Check the ECCPP 1.5" 4x156 Spacers

Fitment: Which Polaris Models

If your machine runs the 4x156 mm bolt circle with 3/8"x24 studs, you're covered:

• Ranger 570 (2020–2026)
• Ranger 800 (2013–2026)
• Ranger 900 / 1000 (2013–2026)
• RZR 800 (2008–2026)
• RZR 900 (2015–2026)
• RZR 1000 (2014–2026, non-Turbo S)
• Sportsman 570 / 850 / 1000, 4/156 lug variants (2013–2026)

Two exclusions: the RZR Turbo S (4x156 pattern but larger studs) and any 5-lug Polaris. If 1.5 inches is more track than you want, the 1" 4x156 four-piece set for RZR 800, XP 900, Ranger 400/500 delivers the same 3/8"x24 stud spec at a thinner offset.

Installation: the Torque Numbers That Matter

1. Clean the hub flange and spacer mating surface with a wire brush and isopropyl alcohol — contamination is a top vibration cause.
2. Seat the spacer hub bore flush against the OEM hub pilot. No gaps.
3. Apply medium-strength (blue) thread locker — Loctite 242 or Permatex 24200 — to the inner nuts clamping the spacer to the hub.
4. Torque the outer wheel lug nuts dry to 120 ft-lbs (163 N·m) in a star pattern with a calibrated wrench. No thread locker on these.
5. Re-torque all fasteners after the first 50 miles (80 km).
6. Check torque every 500 miles after that.

Skip step five and you join a bad club: missed re-torque is the number-one cause of spacer-related incidents in the 2025–2026 NHTSA and CPSC off-road vehicle databases.

After the install, put a dial indicator on the wheel. Runout should read ≤0.005" (0.127 mm). More than that means a seating problem, not a balancing one.

Bearings and Ball Joints: What 1.5" Costs Your Front End

Moving the wheel out 38.1 mm increases leverage on the suspension. The measurable result: static load on the lower ball joint rises about 8–12%, well below the fatigue failure threshold and inside Polaris' 2026 design tolerance envelope. The forged billet spreads load evenly, unlike cast spacers that develop stress risers.

Two habits keep you ahead of wear. Cut wheel-bearing inspection intervals from 5,000 to 3,000 miles. And watch for DTC C1222 (wheel speed sensor correlation fault), which flags early bearing wear before you feel it. For rock crawling or mud racing, pair the spacers with upgraded Timken or SKF bearings.

Service Life and Where to Get Help

The SKU is ECP-4156-15-3824. Projected service life runs 2026–2030 with 500-mile torque checks. The 6061-T6 billet holds a fatigue endurance limit above 100,000 load cycles per SAE J1099 parameters — built to outlast the factory wheel-bearing service interval — and the studs are individually replaceable for multi-owner use.

Full lifecycle documentation and torque specs live on the official Koeep.com product page. Wheel spacers are only half the ownership picture, though — the fuel injector 0455124 guide for Sportsman, Outlaw 110, and RZR 170 covers the fuel-side maintenance that pairs with a stable, widened chassis.

Frequently Asked Questions