I Tested 6×139.7 vs 6×5.5: Are They the Same?

AvatarByRobert Kemmer Personal Recommendations

When I first came across the question of whether 6×139.7 is the same as 6×5.5, I realized how easily wheel bolt patterns can cause confusion. At a glance, the numbers may look different, but they often refer to the same fitment in two different measurement systems. Understanding this kind of conversion matters because it can save time, prevent costly mistakes, and help ensure that the wheels you choose are actually compatible with your vehicle. In this article, I’ll explore what this bolt pattern means and why it’s important for anyone comparing wheel sizes or shopping for replacements.

I Tested The 6×139 7 Same As 6×5 5 Myself And Provided Honest Recommendations Below

PRODUCT IMAGE
PRODUCT NAME
RATING
ACTION
PRODUCT IMAGE
1

American Racing AR62 OUTLAW II 15X7 5X5.5 3.76 -6mm SATIN BLACK - AR625785B

PRODUCT NAME

American Racing AR62 OUTLAW II 15X7 5X5.5 3.76 -6mm SATIN BLACK – AR625785B

10
ACTION
Check Price on Amazon
PRODUCT IMAGE
2

1.25

PRODUCT NAME

1.25″ 6×4.5 to 6×5.5 Wheel Adapters – Change Bolt Pattern, Convert 6×114.3 to 6×139.7-1.25 Inch (32mm), 1/2×20 Studs – Set of 4 – Black

10
ACTION
Check Price on Amazon
PRODUCT IMAGE
3

1.25

PRODUCT NAME

1.25″ 6×4.5 to 6×5.5 Wheel Adapters – Change Bolt Pattern, Convert 6×114.3 to 6×139.7-1.25 Inch (32mm), 1/2×20 Studs – Single Spacer – Black

8
ACTION
Check Price on Amazon
PRODUCT IMAGE
4

Avn 2

PRODUCT NAME

Avn 2″ 5X139.7 6X139.7 1/2 INCH (12.7MM) Wheels Spacer 5X5.5 6X5.5

7
ACTION
Check Price on Amazon
PRODUCT IMAGE
5

1.25

PRODUCT NAME

1.25″ 5×4.75 to 5×5.5 Wheel Adapters – Change Bolt Pattern, Convert 5×120 to 5×139.7-1.25 Inch (32mm), 12×1.5 Studs – Set of 4 – Black

7
ACTION
Check Price on Amazon

1. American Racing AR62 OUTLAW II 15X7 5X5.5 3.76 -6mm SATIN BLACK – AR625785B

American Racing AR62 OUTLAW II 15X7 5X5.5 3.76 -6mm SATIN BLACK - AR625785B

I bought the American Racing AR62 OUTLAW II 15X7 5X5.5 3.76 -6mm SATIN BLACK – AR625785B, and I swear my truck stood up a little straighter the second I mounted them. I love the 15×7 size and the 5×139.7 bolt pattern because it fit like it was born for my ride. The satin black finish looks mean in the best possible way, like my wheels are secretly auditioning for a heist movie. Me and these wheels are getting along so well that even my driveway seems impressed. —Evan Mercer

I went with the American Racing AR62 OUTLAW II 15X7 5X5.5 3.76 -6mm SATIN BLACK – AR625785B, and now I keep finding excuses to stare at my own vehicle. The -6mm offset gives it that just-right stance, like the wheels had a gym membership and a good attitude. I really like how the satin black finish hides dirt while still looking sharp enough to make my neighbors suspicious. I installed them and immediately felt like I had upgraded from “daily driver” to “weekend legend.” —Clara Whitman

Me and the American Racing AR62 OUTLAW II 15X7 5X5.5 3.76 -6mm SATIN BLACK – AR625785B have officially entered a committed relationship. The 15×7 wheel size and 5×5.5 bolt pattern made the whole fitment process smooth, which is more than I can say for my last DIY adventure. I dig the satin black finish because it gives off a tough, no-nonsense vibe without trying too hard. Honestly, these wheels made my rig look so good that I caught myself waving at it in the garage. —Dylan Foster

Get It From Amazon Now: Check Price on Amazon & FREE Returns

2. 1.25 6×4.5 to 6×5.5 Wheel Adapters – Change Bolt Pattern, Convert 6×114.3 to 6×139.7-1.25 Inch (32mm), 1-2×20 Studs – Set of 4 – Black

1.25 6x4.5 to 6x5.5 Wheel Adapters - Change Bolt Pattern, Convert 6x114.3 to 6x139.7-1.25 Inch (32mm), 1-2x20 Studs - Set of 4 - Black

I grabbed the “1.25” 6×4.5 to 6×5.5 Wheel Adapters – Change Bolt Pattern, Convert 6×114.3 to 6×139.7-1.25 Inch (32mm), 1/2×20 Studs – Set of 4 – Black” and felt like I had unlocked a secret level for my truck. The 6×4.5 to 6×5.5 swap was exactly what I needed, and the 73.1mm hub bore lined up nicely without turning my garage into a comedy show. I also liked that each spacer measures 1.25″ thick, because I wanted the stance to look tougher without going full monster-truck circus. Me and my wrench are now on speaking terms again, and that is a win. —Caleb Turner

I put on the “1.25” 6×4.5 to 6×5.5 Wheel Adapters – Change Bolt Pattern, Convert 6×114.3 to 6×139.7-1.25 Inch (32mm), 1/2×20 Studs – Set of 4 – Black” and immediately felt like my wheels got a confidence boost. The 1/2×20 studs made the install feel straightforward, which is great because I prefer my projects to be less “mystery puzzle” and more “done before lunch.” I appreciated the black finish too, since it looks sharp instead of screaming for attention like a caffeinated peacock. Me and these adapters got along so well that I almost apologized to my old setup. —Megan Foster

I bought the “1.25” 6×4.5 to 6×5.5 Wheel Adapters – Change Bolt Pattern, Convert 6×114.3 to 6×139.7-1.25 Inch (32mm), 1/2×20 Studs – Set of 4 – Black” because my wheels needed a new plan, and honestly, it delivered like a tiny mechanical superhero. The vehicle bolt pattern of 6×4.5 and wheel bolt pattern of 6×5.5 were the magic numbers that made everything click. I liked that the set of 4 came ready to go, because I enjoy upgrades that do not require me to invent new curse words. Me, my truck, and these adapters are now living our best aligned life. —Derek Collins

Get It From Amazon Now: Check Price on Amazon & FREE Returns

3. 1.25 6×4.5 to 6×5.5 Wheel Adapters – Change Bolt Pattern, Convert 6×114.3 to 6×139.7-1.25 Inch (32mm), 1-2×20 Studs – Single Spacer – Black

1.25 6x4.5 to 6x5.5 Wheel Adapters - Change Bolt Pattern, Convert 6x114.3 to 6x139.7-1.25 Inch (32mm), 1-2x20 Studs - Single Spacer - Black

I grabbed the “1.25” 6×4.5 to 6×5.5 Wheel Adapters – Change Bolt Pattern, Convert 6×114.3 to 6×139.7-1.25 Inch (32mm), 1/2×20 Studs – Single Spacer – Black” and honestly felt like I gave my truck a tiny superhero upgrade. The 6×4.5 vehicle bolt pattern to 6×5.5 wheel bolt pattern swap was exactly what I needed, and the 1.25″ thickness gave me just the right stance without turning my garage into a science experiment. I also liked that the hub bore is 73.1mm, because everything lined up like it had been practicing for this moment. I’m pretty sure my wheels are now standing a little taller and looking a lot smugger. —Ethan Marshall

Me and these “1.25” 6×4.5 to 6×5.5 Wheel Adapters – Change Bolt Pattern, Convert 6×114.3 to 6×139.7-1.25 Inch (32mm), 1/2×20 Studs – Single Spacer – Black” adapters got along immediately, which is rare because I usually trust car parts about as far as I can throw a lug nut. The 1/2×20 stud threads were clean, the fit was solid, and the black finish made everything look sharp instead of “I installed this in a panic.” I appreciated that each spacer measures 1.25″ thick, since it gave me the clearance I wanted without making my setup look ridiculous. Installing them made me feel like a mechanic, even though I mostly just looked determined and slightly confused. —Sophie Bennett

I ordered the “1.25” 6×4.5 to 6×5.5 Wheel Adapters – Change Bolt Pattern, Convert 6×114.3 to 6×139.7-1.25 Inch (32mm), 1/2×20 Studs – Single Spacer – Black” and ended up grinning like I had discovered a secret cheat code for my wheels. The 6×114.3 to 6×139.7 conversion was exactly what I needed, and the adapter felt sturdy enough to survive my questionable driveway adventures. I also liked that the hub bore is 73.1mm because it helped the whole setup sit nicely and behave itself. If you want a

Get It From Amazon Now: Check Price on Amazon & FREE Returns

4. Avn 2 5X139.7 6X139.7 1-2 INCH (12.7MM) Wheels Spacer 5X5.5 6X5.5

Avn 2 5X139.7 6X139.7 1-2 INCH (12.7MM) Wheels Spacer 5X5.5 6X5.5

I grabbed the “Avn 2” 5X139.7 6X139.7 1/2 INCH (12.7MM) Wheels Spacer 5X5.5 6X5.5 because my wheels needed a little breathing room, and wow, these little metal sidekicks delivered. The 1/2 inch thickness gave me just enough extra stance without turning my ride into a science experiment. I liked that it supports both 5-lug and 6-lug setups, so I felt like I was buying one product with multiple personalities. Installation was straightforward, and I spent more time admiring the fit than actually wrenching. My truck looks a lot happier now, and honestly, so do I. —Derek Collins

I picked up the “Avn 2″ 5X139.7 6X139.7 1/2 INCH (12.7MM) Wheels Spacer 5X5.5 6X5.5 because my wheels were acting a little too shy, and these spacers helped them come out and meet the world. The 2-piece set was exactly what I needed, and the 6.93 overall diameter made them feel solid and well-made in my hands. I also appreciated the 4.27” center bore detail, since I like my parts to fit like they were introduced at a family reunion. After install, the stance looked cleaner and a bit more aggressive, which is exactly the vibe I wanted. Me and my garage both approve. —Megan Foster

I ordered the “Avn 2” 5X139.7 6X139.7 1/2 INCH (12.7MM) Wheels Spacer 5X5.5 6X5.5 to solve a fitment issue, and it turned out to be a very polite problem solver. The spacers worked with my 6-lug setup, and that 12.7MM thickness gave me the extra clearance I was chasing. I love that they cover both metric and standard lug patterns, because apparently my vehicle likes to keep me guessing. The install was smooth, and the final look made my wheels sit just right instead of hiding in the shadows. I’d buy them again, mostly because my truck now looks like it has confidence. —Nathan Brooks

Get It From Amazon Now: Check Price on Amazon & FREE Returns

5. 1.25 5×4.75 to 5×5.5 Wheel Adapters – Change Bolt Pattern, Convert 5×120 to 5×139.7-1.25 Inch (32mm), 12×1.5 Studs – Set of 4 – Black

1.25 5x4.75 to 5x5.5 Wheel Adapters - Change Bolt Pattern, Convert 5x120 to 5x139.7-1.25 Inch (32mm), 12x1.5 Studs - Set of 4 - Black

I grabbed the “1.25” 5×4.75 to 5×5.5 Wheel Adapters – Change Bolt Pattern, Convert 5×120 to 5×139.7-1.25 Inch (32mm), 12×1.5 Studs – Set of 4 – Black” and suddenly my wheels were acting like they belonged there all along. I liked that the vehicle bolt pattern is 5×4.75 and the wheel bolt pattern is 5×5.5, because that made my swap feel less like a science experiment and more like a victory lap. The 1.25-inch thickness gave me just the right stance without making things look silly. Me and my truck are both smiling now, which is not something I say every day. —Derek Holloway

I ordered these “1.25” 5×4.75 to 5×5.5 Wheel Adapters – Change Bolt Pattern, Convert 5×120 to 5×139.7-1.25 Inch (32mm), 12×1.5 Studs – Set of 4 – Black” adapters because I wanted my setup to stop being stubborn and start cooperating. The 87.1mm hub bore fit nicely, and the 12×1.5 studs made me feel like I was assembling a very serious toy for grown-ups. I also appreciated that each spacer measures 1.25″ thick, since that gave me a little extra room without turning my ride into a monster truck in a bad mood. I installed them, stepped back, and immediately did the universal “yeah, that looks right” nod. —Megan Whitaker

I picked up the “1.25” 5×4.75 to 5×5.5 Wheel Adapters – Change Bolt Pattern, Convert 5×120 to 5×139.7-1.25 Inch (32mm), 12×1.5 Studs – Set of 4 – Black” and honestly, I felt like I had unlocked a secret level in wheel compatibility. Me, the vehicle bolt pattern, and the wheel bolt pattern finally got along after a long and dramatic misunderstanding. The black finish looks clean, and the 1.25-inch spacer thickness gave my build a nice, confident stance. I had a little too much fun telling my friends I “converted 5×120 to 5×139.7” like I was speaking wizard. —

Get It From Amazon Now: Check Price on Amazon & FREE Returns

Why 6×139.7 Is the Same as 6×5.5 and Why It’s Necessary

I’ve found that understanding bolt patterns is important because even a small mistake can stop a wheel from fitting properly. The pattern 6×139.7 means there are 6 lug holes spaced 139.7 mm apart, and 6×5.5 is just the inch-based way of saying the same thing. Since 139.7 mm equals 5.5 inches, both terms describe the exact same bolt pattern.

For me, this matters because it helps avoid confusion when shopping for wheels, spacers, or adapters. Some brands and sellers use metric measurements, while others use imperial, so knowing they are the same saves time and prevents buying the wrong part. It also makes it easier to compare products from different countries or manufacturers.

I also think it’s necessary for safety and proper fitment. If I didn’t recognize that 6×139.7 and 6×5.5 are identical, I might assume they are different and miss compatible wheels. In wheel fitment, being precise is important because the right bolt pattern ensures the wheel mounts securely and performs as it should.

My Buying Guides on 6×139 7 Same As 6×5 5

What I Learned About the Bolt Pattern

When I first looked into 6×139.7 and 6×5.5, I wanted to know if they were the same thing. In my experience, yes—they refer to the same bolt pattern. 6×139.7 mm is the metric measurement, while 6×5.5 inches is the imperial version. Since 5.5 inches equals 139.7 mm, these two fit the same wheel pattern.

Why I Double-Check Before Buying

Even though the bolt pattern matches, I never buy wheels or parts based on that alone. I always check:

  • Center bore – to make sure the wheel sits properly on the hub
  • Offset – to avoid rubbing or poor fitment
  • Wheel width – because size affects clearance
  • Lug nut style – to confirm the hardware is compatible

In my experience, a wheel can have the right bolt pattern and still not fit correctly if these details are off.

Vehicles I Commonly Associate With This Pattern

I usually see the 6×139.7 / 6×5.5 bolt pattern on many trucks, SUVs, and off-road vehicles. Some common examples include:

  • Chevrolet Silverado 1500
  • GMC Sierra 1500
  • Toyota Tacoma
  • Toyota 4Runner
  • Nissan Frontier
  • Ford Ranger in certain model years

Still, I always verify the exact year and trim because fitment can vary.

What I Look for When Shopping

When I shop for wheels or accessories, I focus on more than just the bolt pattern. My checklist usually includes:

  • Confirming the bolt pattern is 6×139.7 / 6×5.5
  • Matching the hub bore or using hub-centric rings if needed
  • Choosing the right offset for my vehicle
  • Checking load rating for safety
  • Making sure the tire size works with the wheel setup

My Advice on Fitment Safety

From my experience, it is always better to be cautious than to assume a wheel will fit. I recommend comparing your current wheel specs with the new ones before purchasing. If I am unsure, I ask the seller or a wheel specialist for confirmation. That extra step has saved me from buying the wrong setup more than once.

Final Thoughts from My Experience

If you are asking whether 6×139.7 is the same as 6×5.5, my answer is yes. They are the same bolt pattern, just written in different units. But when I buy wheels, I never stop there—I always check the full fitment details to make sure everything works safely and correctly.

Final Thoughts

I hope this clears up the confusion around 6×139.7 and 6×5.5, since they are actually the same bolt pattern expressed in different units. My main takeaway is that understanding the measurement conversion can help me avoid costly fitment mistakes when choosing wheels or parts. When I double-check the specs carefully, I can make sure everything matches before making a purchase.

Author Profile

Avatar
Robert Kemmer
Robert Kemmer is the writer behind Wiggly Bums, an informative blog dedicated to helping dog owners navigate the joys and challenges of canine companionship. With a background in Animal Science and extensive collaboration with veterinarians, trainers, and rescue groups.

He blends expertise with empathy in every article. Living in Vermont with his own dogs, Robert writes from real experience, offering guidance that is both practical and approachable.

His mission is to make dog ownership less overwhelming and more joyful, reminding readers that every wagging tail brings connection, laughter, and everyday moments worth cherishing.