Isnt 139.7mm same as 5.5"?

[michelle227]

***edited to correct metric number

Had some wheels i was looking at on the Ford Petformance site and got the message they would fit my vehicle...

Some are listed as 139.7mm six bolt and some as 5.5" six bolt, all with 55 offset (which is what I thought stock wheels still were showing).

The converter i used had the mm to inch as being equivalent, so what am I missing? Or does their system just not do metric conversion math and prompts the warning?

For purposes of discussion, I've got a '26 non-SAS Badlands still with stock wheels.

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[2door]

5.5" is 139.7 mm

 

[michelle227]

5.5" is 139.7 mm

Now I need to go look again...I know the numbers matched in a converter, so it may have been 139.7. I remember there was a decimal in there. I posted from memory, not looking in another window at the same time...

Question remains the same...is their system so lame that it just looks for Bronco=x even if y also equaled x?

 

[Brian_B]

1.5mm doesn't sound like much, until you are -->| |<-- away from making that bolt fit.

5.5" is the same as 139.5mm (which you can find if you search for). 137mm is a different size.

 

[michelle227]

Looked at wheels again and they ARE 139.7mm, which comes back to the programming question of why would the system list as incompatible?

 

[2door]

Looked at wheels again and they ARE 139.7mm, which comes back to the programming question of why would the system list as incompatible?

That's s only because some people were never taught the metric system in school. 5.5" x 6 and 139.7 x 6 bolt patterns are the same.

 

[JL8jeff]

Looked at wheels again and they ARE 139.7mm, which comes back to the programming question of why would the system list as incompatible?

Do you have a link we can doublecheck for you? Bronco Raptors have a different bolt pattern so you have to look carefully. If the wheels you are looking at are wider than stock, then they might say incompatible even though they might be fine. Stock wheels are mostly +55 mm backspacing, the Sas wheels are +30 mm but they are wider as well.

 

[87-Z28]

The converter i used

25.4 mm/inch

 

[Murfs Bronco]

Looked at wheels again and they ARE 139.7mm, which comes back to the programming question of why would the system list as incompatible?

It may be because the hub bore on the wheel may be less than 93.1.

 

[2door]

It may be because the hub bore on the wheel may be less than 93.1.

Only the Bronco Raptor has a smaller wheel center bore (87 mm); all other trims have 93.1 mm.

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