KMC KM552 IMS 6X139.7 18x9 +18 GLOSS SILVER W/ MACHINED FACE - KM552SD18906818

Wheel offset is the distance from the wheel's mounting surface to its centerline, measured in millimeters. This wheel has a 18 offset.

Positive offset: Mounting surface is closer to the street side (wheel sits further in)
Negative offset: Mounting surface is closer to the brake side (wheel sits further out)
Zero offset: Mounting surface is at the centerline

💡 Why it matters: Offset affects your vehicle's track width, suspension geometry, and tire clearance. The wrong offset can cause rubbing, poor handling, or premature suspension wear.

To ensure proper fitment, you need to verify:

• ✅ Bolt Pattern: Must match your vehicle's hub (this wheel is 6x139.7)
• ✅ Center Bore: Must match or be larger than your vehicle's hub diameter
• ✅ Wheel Size: Must have clearance for brakes, suspension, and fenders
• ✅ Offset: Must provide proper clearance without rubbing

📞 Not sure? Our fitment experts are here to help! Contact us at sales@threepiece.us

Hubcentric rings are plastic or aluminum rings that fill the gap between your vehicle's hub and the wheel's center bore.

Do you need them?

• ✅ YES - If the wheel's center bore is larger than your vehicle's hub diameter
• ❌ NO - If the wheel's center bore exactly matches your hub diameter

💡 Why they matter: Hubcentric rings ensure the wheel is perfectly centered on the hub, reducing vibration and preventing wheel wobble at high speeds.

It depends on your situation:

• 🔄 Transferring from old wheels: Your existing TPMS sensors can usually be transferred to your new wheels during installation
• 🆕 Buying a second set: If you're keeping your stock wheels (e.g., for winter tires), you'll need a new set of TPMS sensors
• ⚠️ Broken or old sensors: This is a good time to replace failing TPMS sensors

💡 Pro tip: Most vehicles manufactured after 2008 require TPMS by law. Your TPMS light will illuminate if sensors aren't installed or functioning.

The 6x139.7 bolt pattern is commonly found on:

This bolt pattern is used across various makes and models. Contact our fitment experts to verify compatibility with your specific vehicle.

Cast Wheels:

• ✅ More affordable
• ✅ Great for street use
• ✅ Wide variety of styles
• ⚠️ Heavier than forged

Forged Wheels:

• ✅ Lighter and stronger
• ✅ Better performance
• ✅ More durable
• ⚠️ Higher price point

Flow-Formed Wheels:

• ✅ Middle ground between cast and forged
• ✅ Lighter than cast, more affordable than forged
• ✅ Great for performance builds on a budget

💡 This wheel features MONOBLOCK construction.

It depends on the lug nut seat type:

• 🔩 Conical/Tapered Seat (60°): Most common, cone-shaped
• 🔩 Ball/Radius Seat: Rounded, often used on aftermarket wheels
• 🔩 Flat/Washer Seat: Flat with a washer, common on trucks
• 🔩 Mag Seat: Flat seat specifically for mag-style wheels

⚠️ Important: Using the wrong lug nut seat type can damage your wheels or cause them to loosen while driving, which is extremely dangerous.

💡 Pro tip: Most aftermarket wheels require conical seat lug nuts. If your stock wheels use ball seat lugs, you'll need new ones.

For 5-lug wheels (most common):

1. Measure from the center of one lug hole to the center of the hole directly across (skip one hole)
2. This gives you the diameter in millimeters (e.g., 114.3mm)
3. The pattern is written as: 5x114.3 (5 lugs x 114.3mm diameter)

For 4-lug wheels:

1. Measure from the center of one lug hole to the center of the opposite hole
2. Example: 4x100 (4 lugs x 100mm diameter)

For 6-lug wheels:

1. Measure from the center of one lug hole to the center of the hole directly across
2. Example: 6x139.7 (6 lugs x 139.7mm diameter)

📏 Measuring tip: Use a digital caliper for accuracy, or use our bolt pattern guide

Replica wheels are aftermarket wheels designed to mimic the style of OEM (factory) or popular high-end wheels, but at a more affordable price point.

Key differences:

• 💰 Price: Significantly less expensive than original wheels
• 🏭 Manufacturing: Made by different manufacturers, not the original brand
• ⚖️ Weight: May be heavier or lighter than originals
• 🎨 Quality: Varies by manufacturer - some are excellent, others less so

Are replica wheels safe?

✅ Yes, when purchased from reputable sellers. Quality replicas meet safety standards and are fine for street use. However, for track use or high-performance applications, OEM or forged wheels are recommended.

💡 At Threepiece.us: We only carry replica wheels from trusted manufacturers that meet or exceed safety standards.

Wheel sizing is written as Diameter x Width (both in inches):

• 📏 18" = Diameter (height of the wheel from edge to edge)
• 📏 9" = Width (measured from inner bead seat to outer bead seat)

This wheel is KMCx9, meaning:

• 🎯 It accepts KMC-inch tires
• 🎯 The wheel width affects tire stretch/fit and stance

💡 Larger diameter = lower profile tires (better handling, harsher ride)
💡 Wider wheels = wider tires (better grip, more aggressive stance)

Load rating is the maximum weight a wheel can safely support, measured in pounds or kilograms per wheel.

Why it matters:

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