Understanding what vehicles use the 8x170 bolt pattern is essential for Ford Super Duty owners looking for the perfect wheel upgrade. This bolt pattern is exclusively found on Ford vehicles, making it a specialized specification when selecting aftermarket wheels.
Ford introduced this distinctive bolt pattern in 1999 for their heavy-duty truck lineup. The 8x170 pattern appears on Ford Excursion models from 1999-2005, plus F-250 and F-350 Super Duty trucks from 1999 through the current 2025 model year. Many people assume it's interchangeable with the common 8x6.5 (8x165.1mm) pattern found on other trucks. However, they differ by only 0.16 inches, yet this small gap makes them completely incompatible without adapters. Importantly, no conversion kits exist to change from 8x6.5 to 8x170.
We'll guide you through everything you need to know about the 8x170 bolt pattern, compatible vehicles, essential fitment factors, and how to select the right wheels for your Ford truck.
Proper wheel fitment starts with understanding exactly what those numbers mean. The 8x170 bolt pattern contains critical information that determines whether wheels will fit your Ford Super Duty truck correctly.
Breaking down the 8x170 designation reveals two key measurements. The first number "8" tells you how many lug nuts or bolts secure the wheel to your vehicle. The second number "170" indicates the diameter in millimeters of the circle formed by these lug nuts—known as the pitch circle diameter (PCD). Picture drawing a circle through the center of all eight lug holes, and that circle measures exactly 170mm across. When converted to imperial measurements, 8x170 equals approximately 8x6.69 inches.
Getting accurate PCD measurements prevents costly fitment mistakes. The correct method requires measuring from the center of one lug hole to the center of the hole directly opposite it. On an 8-lug wheel, you measure from any lug hole to the fourth hole across from it.
Many people make the mistake of measuring from hole edges instead of centers. This approach leads to incorrect measurements and poor wheel selection. Always measure center to center for precise results that ensure proper fitment.
These patterns look nearly identical but have important distinctions:
Size variance: The 8x6.5 pattern (8x165.1mm) measures 4.9mm smaller than the 8x170 pattern
Brand application: Ford uses 8x170 exclusively on Super Duty trucks from 1999 forward, while 8x6.5 appears on RAM 2500s, single rear wheel 3500s, and older GMC/Chevrolet 2500 models
Compatibility issues: Less than 5mm separates these patterns, but they require adapters or modifications to work together
This small measurement difference means wheels made for one pattern won't fit the other without specialized hardware—a crucial factor when shopping for aftermarket wheels.
The 8x170 bolt pattern appears exclusively on Ford's heavy-duty truck lineup. Knowing which specific trucks use this pattern ensures you select compatible wheels without costly mistakes.
Every Ford F-250 Super Duty truck from 1999 through current 2025 models uses the 8x170mm bolt pattern with a 124.9mm hub bore. Factory wheels typically feature offset ranges between +40mm and +50mm, with backspacing ranging from 5.5" to 6.5".
Wheel sizes vary by trim level. Base trims come with 17x7.5" wheels, while mid-level trims use 18x8" configurations. Premium trims like Lariat and King Ranch feature larger 20x8.5" wheels. Top-tier Platinum and Limited trims come equipped with 22x9" wheels for maximum visual impact. All F-250 models use M14x1.5 thread size.
F-350 Super Duty single rear wheel (SRW) trucks from 1999 through 2025 use the 8x170 bolt pattern. However, dual rear wheel (DRW) F-350s use a different 8x200mm pattern. This distinction is crucial when shopping for wheels.
The hub bore remains 124.9mm across compatible models. Offset specifications changed between generations—1999-2004 F-350 SRW trucks have a 0.25" offset, while 2005-onward models feature a 1.41" offset. This difference affects fitment when mixing wheels across model years.
Ford Excursion SUVs produced from 1999 through 2005 exclusively use the 8x170 bolt pattern. These vehicles share chassis components with their F-250/F-350 truck counterparts. Excursions typically came with 16" wheels as standard, though larger sizes were available on higher trim levels. Performance Plus Tire offers an extensive selection of current 8x170 wheel options for Excursion owners.
Ford introduced the 8x170 bolt pattern specifically for the Super Duty line in 1999. Before 1999, Ford heavy-duty trucks used the more common 8x6.5" (8x165.1mm) pattern. Ford developed this unique specification to distinguish their heavy-duty lineup and accommodate the increased load capacities of Super Duty trucks. Since 1999, the 8x170 pattern has remained exclusive to Ford Super Duty vehicles—no other manufacturer has adopted this specification.
Proper wheel fitment involves much more than matching the 8x170 bolt pattern. Several critical specifications determine whether your wheels will fit correctly and perform safely on Ford Super Duty trucks.
Offset measures the distance from the wheel's centerline to the mounting surface. Ford Super Duty trucks with the 8x170 pattern typically work best with offsets ranging from +0mm to +50mm. Backspacing—measured in inches from the mounting surface to the wheel's back edge—controls how your wheel positions in the wheel well. Wrong offset causes tires to rub against suspension components or fenders. Lower backspacing pushes the wheel outward for a wider stance, but this can stress wheel bearings over time.
The hub bore (center bore) must match your truck's hub diameter precisely. Ford Super Duty trucks use a hub bore of approximately 124.9mm to 125mm. Wheels come in two types: hub-centric (center bore exactly matches the hub) or lug-centric (larger bore than the hub). When using aftermarket wheels with larger bores, hub-centric rings ensure proper alignment and reduce vibrations.
Correct torque is essential for safe operation. Ford F-250/350 Super Duty trucks with 8 lugs need a torque specification of 150-165 ft-lbs. The owner's manual typically specifies 150 ft-lbs, while the service manual may list 165 ft-lbs. Wrong torque values create dangerous situations—wheels can come loose or studs can break.
Getting the right bolt pattern saves you from costly mistakes when buying wheels for your Ford Super Duty. We recommend several proven methods to confirm wheel compatibility before making any purchase.
Bolt pattern calculators take the guesswork out of metric and standard conversions. For the 8x170 pattern (approximately 8x6.69"), these tools provide precise comparisons when shopping for wheel options. Most online converters need just the number of lugs and diameter measurement to verify compatibility. Ford Super Duty owners can use these calculators to double-check that 8x170 matches their 1999-2025 F-250/F-350 models.
Manual measurement requires simple tools: a ruler, tape measure, or caliper for best accuracy. For 8-lug wheels on Ford trucks:
Remove two opposing lug nuts
Measure from center-to-center of the exposed bolts
Verify this measurement equals 170mm (6.69")
Avoid common errors like measuring from hole edges instead of centers or mixing metric and imperial units. Your owner's manual also lists the bolt pattern specification for quick reference.
Online databases make verification simple by entering your truck's make, model and year to confirm the 8x170 pattern. Check Performance Plus Tire's database for compatible 8x170 wheels. Physical fitment tools like Speedway Motors' WheelWise® simulator help you visualize how different wheels and tires will look on your specific truck.
The 8x170 bolt pattern knowledge empowers Ford Super Duty owners to make confident wheel selections. This guide has covered how Ford exclusively uses this pattern on their heavy-duty trucks from 1999 through 2025 model years. We've also explained why the 8x170 differs from the common 8x6.5 specification.
Selecting wheels for your F-250, F-350, or Excursion involves more than bolt pattern matching. You need to consider offset ranges, backspacing measurements, and hub bore compatibility for optimal fitment. Proper torque specifications (150-165 ft-lbs) ensure both safety and performance.
The 8x170 pattern's Ford exclusivity makes compatibility verification essential before any wheel purchase. Manual measurement techniques, online calculators, and fitment databases help confirm your exact specifications. When shopping for compatible 8x170 wheels for your Ford Super Duty, you'll find an extensive selection at Performance Plus Tire's dedicated 8x170 bolt pattern page.
You can now select wheels that fit your Ford truck perfectly while matching your style preferences and performance requirements. The 8x170 pattern may limit options compared to universal specifications, but many manufacturers still produce high-quality wheels designed specifically for Ford vehicles.
Understanding the 8x170 bolt pattern is crucial for Ford Super Duty owners to ensure proper wheel fitment and avoid costly purchasing mistakes.
• The 8x170 bolt pattern is exclusive to Ford vehicles: F-250/F-350 Super Duty (1999-2025) and Excursion (1999-2005)
• 8x170 differs from 8x6.5 by only 4.9mm, but they're not interchangeable without adapters or modifications
• Proper fitment requires matching offset (+0 to +50mm), hub bore (124.9mm), and torque specs (150-165 ft-lbs)
• Always verify compatibility using manual measurement, bolt pattern calculators, or fitment databases before purchasing
• Ford introduced this unique pattern in 1999 specifically for Super Duty trucks to distinguish their heavy-duty lineup
The 8x170 pattern's exclusivity to Ford means fewer wheel options compared to universal patterns, but numerous manufacturers still produce high-quality wheels specifically designed for these vehicles.
8x170 wheels fit Ford F-250 and F-350 Super Duty trucks from 1999 to 2025 model years, as well as Ford Excursion SUVs produced from 1999 to 2005. This bolt pattern is exclusive to these Ford heavy-duty vehicles.
The 8x170 bolt pattern is 4.9mm larger than the 8x6.5 (8x165.1mm) pattern. Despite this small difference, they are not interchangeable without adapters or modifications. The 8x170 pattern is unique to Ford Super Duty vehicles, while 8x6.5 is common on other truck brands.
Besides matching the bolt pattern, it's crucial to consider wheel offset (typically +0 to +50mm for Ford Super Duty), backspacing, hub bore size (around 124.9mm), and proper torque specifications (150-165 ft-lbs). These factors ensure optimal fitment and performance.
You can verify the 8x170 bolt pattern by using a bolt pattern calculator, measuring manually from the center of one lug hole to the center of the opposite fourth hole, or consulting online fitment databases. Always double-check measurements to avoid costly mistakes.
Ford introduced the 8x170 bolt pattern in 1999 specifically for their Super Duty truck lineup. Prior to 1999, Ford heavy-duty trucks used the more common 8x6.5" (8x165.1mm) pattern. The 8x170 pattern has remained exclusive to Ford Super Duty vehicles since its introduction.
