Biggest Tires on a Stock Lexus GX470 & GX460: Fitment Guide

The Lexus GX is a Land Cruiser Prado wearing a Lexus badge, and that is exactly why it has become one of the hottest overland platforms on the used market. You get a fully boxed body-on-frame chassis, full-time 4WD with a locking center diff, a V8 and a cabin that is still quiet at 200,000 miles, often for less than a clean 4Runner. The catch is fitment. The GX ships with skinny, short tires, a front bumper that hangs low, and suspension systems (KDSS and rear air) that change how you lift it.

This guide covers both generations sold in the US: the GX470 (J120, 2003–2009) and the GX460 (J150, 2010–2023, including the 2014 and 2020 facelifts), with a short section on the new GX550. Where a fitment claim comes from owner builds rather than a factory spec, we say so.

Stock Wheel & Tire Specs: What Lexus Shipped

Shared GX470 and GX460 wheel specs: 6x139.7 (6x5.5″) bolt pattern, M12x1.5 lug thread, 106.1mm center bore, lug nut torque 83 ft-lb (112 N·m). Some databases list the GX470 offset as +20mm and the center bore as 108mm, so measure or check the wheel stamp before you order spacers or hub rings.

Takeaway: Every GX460 shipped on a tire about 30.5″ tall, which is short for a truck this size. That is good news: you can gain a full inch of tire on a stock GX460 without touching the suspension. The GX470 starts at 30.6″ and has less room to grow on its factory wheels.

KDSS, Rear Air & Why GX Fitment Is Different

Two factory systems decide how you lift a GX, and both are worth understanding before you buy tires.

KDSS (Kinetic Dynamic Suspension System) links the front and rear sway bars hydraulically so they stiffen on the road and disconnect off-road. It was optional on the GX470 from late 2004 and included in the Sport package from 2005. It is standard on every GX460. With KDSS, a lift needs sway bar spacers (Ironman's 1220K rear spacer kit is a common one) so the bars keep their working angle. Owners also report that the swinging KDSS bar is one of the things that limits tire size at full stuff.

Rear air suspension (AHC). The GX470 came with rear height-adjustable air suspension as standard. On the GX460, rear air was on the 2010–2013 Premium and the 2014+ Luxury grade; Base and 2014+ Premium trucks have coils all around. Quick check: if your console has a second set of height-control buttons, you have air. Most lifted air trucks go to a coil conversion (ICON 56110 and the Strutmasters AHC-delete kit are two common routes), because lifting the air system itself is limited.

The tight spots: the front bumper corner and lower fender liner at full lock, the body mount behind the front tire, the upper control arm (UCA) on low-offset factory wheels, and the running boards. A lift raises static ride height, but at full compression the tire ends up in roughly the same place it would on a stock truck. Clearance off-road comes from offset, trimming and the body mount chop, not lift height alone.

GX470: Biggest Tires on Stock Suspension

The GX470's +25mm offset puts a wide tire close to the upper control arm, so the stock wheel is the limiting factor more than the fenders.

33s on a GX470

The common recipe for 285/70R17 on a GX470:

• Old Man Emu style 2″–2.5″ lift (account for KDSS spacers if your truck has it)
• Wheels in the +15mm to −10mm range; FJ Cruiser, 4Runner and Tundra +15mm wheels are a cheap way to gain about 10mm of UCA clearance
• Mud flap delete and fender liner trim or heat-gun pushback
• Check the front skid plate and bumper corners at full lock
• Know that a 285 spare will not fit in the factory under-body spare location

35s on a GX470

35s on a GX470 are a full build: a 3″ lift, aggressive body mount chop, aftermarket UCAs, real trimming, negative-offset wheels and a regear. The GX470 runs 3.73 gears from the factory, and owners going to 35s generally step to 4.56 (or 4.88 for a heavy, fully built rig). The rear diff is an 8″ unit, and owners report ring-and-pinion failures once tires and weight go up, so factor that into the plan.

GX460: Biggest Tires on Stock Suspension

The GX460 has more room than its stock 30.5″ tire suggests. Owner builds consistently show at least an inch of growth with zero modifications.

Real-world note: The 265/70R18 is the GX460 sweet spot because it keeps the stock wheels, stays 10.4″ wide like the factory tire, and lands right at 33″-class height. If a truck does rub, it is usually the front mud flap and liner area or the rear of the wheel well.

33s on 17″ Wheels (the classic GX460 build)

Many GX460 owners swap to 17″ wheels for more tire sidewall and better tire selection. Owners report that 16″ wheels will not clear the GX460 brakes, so 17″ is the practical minimum.

Required Mods for 33s on a GX460

• 2″–3″ lift with KDSS sway bar spacers (coil conversion if you have rear air)
• 17x8.5 wheels around +0 to +10mm offset; more negative offset makes the body mount contact worse, not better
• Mud flap delete and front liner pushback
• Aftermarket UCAs above about 2.5″ of front lift; Dobinsons and others recommend arms with about 3° of added caster to correct alignment
• Body mount chop likely for 285s with real off-road flex
• A diff drop is commonly recommended with lifts, to ease front CV angles

35-Inch Tires on a GX460

35s (315/70R17, 34.4″, or the narrower 285/75R17, 33.8″) on a GX460 are a serious build. Owners who have done it describe this recipe:

• 2.5″–3″ lift with aftermarket UCAs (SPC is a common pick)
• Body mount chop: owners are blunt that 35s need it
• Front bumper, side step and wheel liner trimming; one owner trimmed about 5–6″ off the rear bumper corners
• 17x8.5 wheels at about −10mm offset
• A rear panhard bar on some builds to recenter the axle
• A regear: the GX460 runs 3.91 gears (3.909) and a 6-speed automatic, and owners typically regear and add lockers on a 35″ truck

Even then, 315s can still rub lightly with the liners removed and the pinch weld pounded flat. Expect to spend real money on this one: lift, arms, wheels, tires, gears and fab work add up to a multi-thousand-dollar project before you buy a single recovery strap.

A Quick Word on the GX550 (2024+)

The new J250 GX550 is a different platform (twin-turbo V6, 10-speed automatic, M14x1.5 studs, 95.1mm center bore), so none of the GX460 wheel specs above carry over. The Overtrail trims ship on 265/70R18 all-terrains (32.6″) with E-KDSS and a rear locker. Early owner and shop testing shows 295/70R18 (34.3″) fitting at stock height with only the mud flaps removed on 18x8.5 +20mm wheels; 0mm offset rubbed. Reported factory offset differs between sources (+50mm vs. +60mm), so confirm your wheel before ordering. We will expand this section as more GX550 builds are documented.

Engines & Gearing: What You're Turning Those Tires With

The GX470's 2UZ-FE is the same V8 found in the 100 Series Land Cruiser and 4th gen 4Runner V8; we cover it in depth in our 2UZ-FE engine guide. For the closest platform cousins, see the 5th gen 4Runner fitment guide and the 100 Series Land Cruiser fitment guide.

Practical Tips Before You Buy

• Mount one tire first. Cycle full lock both directions with the suspension compressed (one wheel on a curb) before committing to a set.
• Check for KDSS and rear air before you price a lift. They change the parts list and the cost. VIN decoders and the console height buttons tell you quickly.
• Don't chase negative offset on a GX460. More poke moves the tire into the body mount. Around +0 to +10mm on a 17x8.5 is the common sweet spot.
• Mud flaps come off first. Free, five minutes, solves a lot of light rubbing.
• Heat-gun the liners before you cut. Plastic holds the new shape once it cools.
• Plan the spare. Bigger tires often will not fit the under-body spare location, especially 285s on the GX470.
• Align after the lift and again after it settles. Budget a second alignment 500–1,000 miles later.
• Recalibrate the speedometer. A 32.6″ tire on a truck that left the factory on 30.5″ reads about 7% slow.

Frequently Asked Questions

What is the stock tire size on a Lexus GX460?

The standard GX460 (2010–2023) tire is 265/60R18, about 30.5″ tall, on an 18x7.5 wheel. The 2020+ Sport Design package uses 265/55R19, which is the same overall height. The bolt pattern is 6x139.7 with M12x1.5 lugs.

What is the biggest tire on a stock GX460 with no lift?

265/65R18 (31.6″) fits on most stock GX460s with no modifications. Many owners run 265/70R18 (32.6″) on stock suspension and stock wheels with the mud flaps removed, though a few trucks still rub. 275/70R18 (33.2″) needs a body mount chop or alignment changes.

What is the stock tire size on a Lexus GX470?

The GX470 (2003–2009) shipped on 265/65R17, about 30.6″ tall, on a 17x7.5 alloy wheel at roughly +25mm offset with a 6x139.7 bolt pattern.

Will 285/70R17 fit a stock GX470?

Not on the factory wheels. Owners report the factory offset puts a 285-wide tire into the upper control arm. Plan on a 2″–2.5″ lift, wheels between +15mm and −10mm offset, mud flap delete and fender liner work. 265/70R17 is the practical max on stock wheels.

Do I need a body mount chop for 33s on a GX460?

For 265/70R18 or 265/75R17, usually not. For 285/70R17 with real off-road flex, likely yes, especially on wheels with negative offset. Some owners on 275/70R17 at +10mm with aftermarket UCAs report no chop needed. For 35s, a body mount chop is required.

Does KDSS limit tire size on a GX?

Indirectly. KDSS is standard on the GX460 and optional on the GX470. A lifted KDSS truck needs sway bar spacers to keep the bars in their working range, and owners report the KDSS bar is one of the parts that limits clearance at full articulation with big tires.

Do I need to regear my GX for 33s?

Usually not on a GX460, which has 3.91 gears and a 6-speed. The GX470's 3.73 gears and 5-speed feel 33s more, especially on a heavy overland build. For 35s, regearing is recommended on both; GX470 owners typically go to 4.56 or 4.88.

Can I put 16-inch wheels on a GX460?

No. Owners report 16″ wheels will not clear the GX460 brakes. 17″ is the smallest practical wheel and the most popular size for 33″ builds because of the tire selection.

Related Toyota Fitment Guides

• Biggest Tires on a Stock 5th Gen 4Runner: Fitment Guide
• Fitting 35-Inch Tires on a 5th Gen 4Runner: Build Guide
• Biggest Tires on a Stock FJ Cruiser: Fitment Guide
• Biggest Tires on a Stock 100 Series Land Cruiser (UZJ100)
• 285/75R17 vs 33x12.50R17: Head-to-Head Tire Comparison
• Toyota 2UZ-FE 4.7 V8: Specs, Reliability & High Mileage Guide
• Tire Fitment Hub