Forza Horizon 6 Tires & Rims Tuning Guide

Forza Horizon 6 tuning is as deep as it is rewarding, and tires are the single most important component on your car. They are the only part of the vehicle that actually touches the road - every other upgrade, every tune slider, every chassis decision works through the tires. Get the tire choice wrong and no amount of suspension tuning will save the build.

This guide covers every tire and rim decision you'll face in FH6: tire compounds, tire width, rim style, rim size, and how to tune front and rear tire pressure for your specific build and discipline.

Tire Compounds

Tire compound is the most consequential choice in this entire section. The compound determines how much grip your tires generate, how fast they wear, how they behave on different surfaces, and how much PI they cost. FH6 offers the following compounds:

• Stock Tires - Whatever the car came with from the factory. Usually balanced for everyday driving rather than any specific discipline. The lowest PI cost and often surprisingly competitive at low classes.
• Street Tires - A modest upgrade from stock. Better dry grip than stock with similar versatility. Low PI cost. Often skipped in favor of going straight to Sport tier.
• Sport Tires - Significantly better dry tarmac grip than Street. Higher PI cost but unlocks meaningful cornering performance. Great choice for B-class road race builds and many A-class builds.
• Semi-Slick Tires - A step between Sport and Race Slicks. Strong dry grip with some wet weather capability. Common pick for A-class and S1-class road race builds where Race Slicks would over-PI the build.
• Race Slicks - Maximum dry tarmac grip available. Heavily PI-penalized but unlocks the highest cornering speeds and lap times on asphalt. Standard for S1, S2, and R class road race builds. Useless on wet or loose surfaces.
• Rally Tires - Mid-grip compound designed for loose surfaces. Strong on dirt and acceptable on tarmac. The "all-around" choice for builds that need to handle mixed conditions in online lobbies.
• Off-Road Tires - Maximum loose-surface grip. Built for cross country, mud, sand, and rough terrain. Acceptable on dirt but poor on tarmac.
• Snow Tires - Available for snow-themed seasonal events. Specialized compound that you'll only need for specific event types.
• Drift Tires - Available on some chassis. Designed to break loose predictably and hold long slides. The choice for serious drift builds.

The FH6 dirt penalty: FH6 applies a heavier PI penalty for using Race Slicks (and to a lesser extent Sport / Semi-Slick) on dirt tracks than FH5 did. This is a deliberate change to push players toward Rally and Off-Road tires for the disciplines they were designed for. If your build is going to see any dirt at all, Rally or Off-Road is almost always the right choice.

Tire Compound by Discipline

Match the compound to the discipline you're building for. Mismatches cost lap time and PI:

• Road racing - B class and below - Sport tires usually, though stock tires can work on lighter cars where the PI cost of Sport hurts power-to-weight ratio more than the grip helps.
• Road racing - A class - Sport or Semi-Slick depending on PI budget. Semi-Slick if you can afford the PI; Sport if you need the savings for other upgrades.
• Road racing - S1 / S2 / R class - Race Slicks. Anything less leaves lap time on the table.
• Dirt racing - Rally tires. Non-negotiable - the PI penalty on Race Slicks makes them slower in dirt despite the raw grip.
• Cross country - Off-Road tires. Same logic as dirt but more extreme - you need the loose-surface grip and impact tolerance.
• Drift - Drift tires (where available) or Sport tires tuned for low pressure. Race Slicks are wrong for drift - they grip too hard to break loose predictably.
• Drag - Race Slicks for launch traction. Drag racing rewards maximum grip off the line.
• Online mixed lobbies - Rally tires. The all-around compound that handles road, dirt, and cross country events without the PI penalty of Race Slicks on dirt.

Tire Width

Tire width is set independently for the front and rear axles in FH6. Wider tires generate more grip but cost more PI, add weight, and increase drag slightly.

Choosing tire width:

• Stock width - Cheapest, lightest, lowest drag. Best at low classes where the PI cost of wider tires outweighs the grip gain.
• Moderate widening (one step up from stock) - A common sweet spot for B-class and A-class builds. Modest grip gain for modest PI cost.
• Maximum width - Required for high-class builds (S1, S2, R) where every available grip helps. Often gated behind a Track Width / Widebody conversion (see the Conversion Tuning Guide).

Front vs Rear width split:

• RWD - Often runs wider rear tires than front to put power down on corner exit. Common splits: 285 front / 325 rear at S1.
• FWD - Often runs equal or slightly wider front tires (the front does all the work). Equal widths are common.
• AWD - Equal widths front and rear are typical. Some builds run slightly wider rears for additional traction on corner exit.

Things to verify before maxing tire width:

• Does your chassis allow the width without a Widebody conversion? If not, factor in the conversion's PI cost.
• Is the resulting drag increase hurting your top speed more than the grip helps your cornering? Check Aero Efficiency after each width change.
• Are you on the right tire compound? Wider Race Slicks help; wider Rally Tires on a CC build do almost nothing.

Rim Style

Rim style in FH6 is mostly cosmetic, but the choice of style does affect weight. Some rim styles are heavier than others, even at the same diameter, and that weight difference can shift your PI by a point or two.

• Single-piece forged race rims - Generally the lightest options. Best for competitive builds.
• Multi-piece rims - Typically a bit heavier than single-piece. Common on showcase and replica builds.
• Classic / retro styles - Weight varies widely. Some heritage styles are surprisingly light (period-correct magnesium rims) while others are heavy (chromed steel).
• Off-road / rally styles - Built for impact tolerance. Slightly heavier than road race styles but more resistant to jump damage in cross country.

For competitive builds, pick the lightest rim style available at your target diameter.

Rim Size

Rim diameter affects three things in FH6: weight, aerodynamics, and tire sidewall flex.

• Smaller rim diameter (15", 16") - Lower weight, marginally better aerodynamics, more tire sidewall flex. Better for off-road and cross country where the tire needs to absorb terrain. Often optimal for grip-focused builds on light cars where sidewall compliance helps maintain contact patch.
• Mid rim diameter (17", 18") - The default sweet spot for most road racing builds. Balances grip, weight, and stiffness. Most stock-derived builds end up here.
• Larger rim diameter (19", 20"+) - Heavier, less sidewall flex (stiffer ride), and worse aerodynamically. Generally only chosen for visual reasons or when the car requires the larger size to fit wider tires.

General rule: use the smallest rim diameter that still lets you fit your target tire width. Going larger costs PI and weight without performance benefit unless your build specifically needs the wider tire that requires the larger rim.

Discipline considerations:

• Road racing - 17-18" is the typical sweet spot. Going larger costs PI for marginal benefit.
• Dirt racing - 15-16" preferred. Sidewall flex helps absorb terrain impacts.
• Cross country - 15-16" mandatory. Larger rims will crack tires on jump landings.
• Drag racing - 17-18" with maximum tire width. Sidewall stiffness helps launch traction.
• Drift - 17-18". Some prefer larger for the visual, but performance-focused drift builds stay moderate.

Tuning Front and Rear Tire Pressure

Tire pressure is set independently for the front and rear axles in the Tune menu's Tires section. The slider range varies by car but is typically 1.0 - 3.8 BAR (about 14 - 55 PSI).

What pressure does:

• Lower pressure - Larger contact patch (more grip), softer ride, more tire roll, faster heat buildup (good for cold tires, bad for sustained loads).
• Higher pressure - Smaller contact patch (less peak grip), firmer ride, less tire roll, slower heat buildup, more responsive turn-in.
• Sweet spot - The pressure where the tire's contact patch is maximized AND the tire stays in its optimal operating temperature range. The tune menu doesn't show this directly - you find it by driving the car and watching the tire color indicator (should sit in the orange-red band when warm, not red-hot).

Baseline pressures by compound:

• Stock / Street tires - 31.0 PSI / 2.14 BAR
• Sport tires - 31.5 PSI / 2.17 BAR
• Semi-Slick - 32.0 PSI / 2.21 BAR
• Race Slicks - 32.5 PSI / 2.24 BAR
• Rally tires - 29.0 - 30.0 PSI / 2.00 - 2.07 BAR
• Off-Road tires - 28.0 - 30.0 PSI / 1.93 - 2.07 BAR
• Drift tires - 20.0 - 26.0 PSI / 1.38 - 1.79 BAR (intentionally low for slip)

These are starting points. Adjust by 0.5 PSI / 0.05 BAR at a time based on driving feel.

Front vs Rear pressure split:

• RWD - Front slightly higher than rear, often by 0.5 - 1.0 PSI. Higher front = sharper turn-in. Lower rear = more contact patch for putting power down on corner exit.
• FWD - Front higher than rear by 1.0 - 2.0 PSI. The front does all the work (steering + power + braking) so higher pressure keeps it shape-stable under load. Lower rear gives the unloaded rear more compliance.
• AWD - Equal pressure front and rear, or front slightly higher (0.2 - 0.5 PSI). Power is distributed to all four wheels; symmetric pressure is usually best.
• Drift builds - Both ends low (around 20 PSI), with the rear typically the same as the front or slightly lower. You want both ends to slide predictably.

Heavier cars need higher pressures: A 600 kg kei car wants 28-30 PSI on sport tires; a 1,800 kg muscle car on the same compound wants 33-35 PSI. The heavier the car, the more the tire needs to resist deformation under load.

Wider tires need slightly higher pressures: Going from 235 to 285 wide rear tires? Add 0.5 - 1.0 PSI to maintain shape stability.

Tire Pressure Track-Test Adjustments

After your first laps, diagnose by symptom and adjust pressures accordingly:

• Pushing wide through corners (understeer) - Drop front pressure by 0.5 PSI to enlarge the front contact patch
• Tail steps out on corner entry (lift-off oversteer) - Drop rear pressure by 0.5 PSI
• Tail spins under throttle (power oversteer) - Raise rear pressure by 0.5 PSI to reduce rear grip and lockup, OR fix in differential tuning
• Tires overheat (red indicator) on long stints - Raise pressure by 0.5 PSI to reduce sidewall flex (which generates heat)
• Tires stay cold (blue indicator) on short sprints - Lower pressure by 0.5 PSI to flex more and heat up faster
• Car feels twitchy at high speed - Raise rear pressure by 0.3 PSI for more rear stability

Discipline-Specific Tire Strategy

• Road racing - twisty circuits - Race Slicks (or Semi-Slick at A class), moderate width, 17-18" rim, pressure 31.5-32.5 PSI both ends with front slightly higher. Prioritize cornering grip over straight-line drag reduction.
• Road racing - speed circuits - Same compound as above but consider dropping a tire width step to save PI for engine upgrades. Drag matters more on long straights.
• Dirt racing - Rally tires, stock or moderate width, 15-16" rim, pressure 2.0 BAR both ends symmetric for AWD. Sidewall flex is your friend on bumpy stages.
• Cross country - Off-Road tires, maximum width if available, 15-16" rim, pressure 1.9 BAR both ends. Maximum contact patch over uneven terrain.
• Drift - Drift tires (or Sport tuned low), 17-18" rim, pressure 20-22 PSI both ends. Low pressure makes the tires slide predictably.
• Drag - Race Slicks, maximum rear width (especially on RWD), 17-18" rim, low rear pressure for maximum launch contact patch (~25 PSI rear, 32 PSI front).
• All-around / online mixed lobbies - Rally tires, moderate width, 17" rim, pressure 2.0 BAR both ends symmetric. The compromise build for online versatility.

Common Tire and Rim Mistakes

• Race Slicks on dirt builds - FH6's heavier PI penalty for Race Slicks on dirt makes this slower than Rally tires despite the raw grip. Always match compound to surface.
• Maxing tire width on low-class builds - At B class and below, the PI cost of maximum-width tires often outweighs the grip gain. The lighter chassis can't fully load the wider tire, so the extra contact patch is wasted.
• Stock pressure on race compounds - Stock pressure (often 32 PSI both ends) is calibrated for stock tires. After upgrading to Race Slicks or Rally tires, you need to retune pressure for the new compound's characteristics.
• Larger rims for visual reasons - 19" and 20" rims look great but cost PI and reduce sidewall flex. For competitive builds, stay at 17-18" unless you specifically need the size for tire fitment.
• Equal pressure on FWD - FWD wants higher front pressure than rear. Running equal pressures on FWD leaves grip on the table at the front (where it's needed most) and adds unnecessary firmness at the rear (where it doesn't help).
• Ignoring tire temperature - The tire color indicator (visible in some race UI overlays) is the fastest way to dial in correct pressure. If your tires are red-hot at the end of a lap, raise pressure. If they stay cold, lower pressure.
• Skipping Sport tires at B class - On many B-class road race builds, Sport tires are the single largest gain-per-PI of any upgrade. Don't skip them to save PI for engine upgrades; the grip enables everything else.

Glossary

• Tire Compound - The rubber recipe used in the tire, which determines its grip, durability, and surface compatibility. Stock, Street, Sport, Semi-Slick, Race Slicks, Rally, Off-Road, Snow, and Drift compounds exist in FH6.
• Tire Width - The contact patch width of the tire, measured in millimeters (e.g. 235mm, 285mm, 325mm). Wider tires generate more grip but cost more PI.
• Tire Pressure - The air pressure in the tire, measured in BAR or PSI. Tunable in the Tune menu's Tires section. Affects contact patch size and tire temperature behavior.
• Rim Diameter - The size of the wheel rim in inches (15", 16", 17", etc.). Smaller diameter = lighter and more sidewall flex; larger = stiffer ride and worse aero.
• Sidewall Flex - The amount the tire's sidewall compresses under load. More flex = better terrain compliance, worse high-speed precision. Less flex = sharper turn-in, harder over bumps.
• Contact Patch - The area of the tire that's actually touching the road at any given moment. Larger contact patch = more grip, but only if the tire is in its operating temperature range.
• PSI / BAR - Units of tire pressure. 1 BAR ≈ 14.5 PSI. FH6 displays pressure in BAR by default but PSI is the more common unit in tuning communities.
• Class - The PI rating tier for your build. FH6 classes are D, C, B, A, S1, S2, and R. R class is new in FH6 (PI 999+) and replaces the X class from earlier games.

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