8 lug stud spacing
 

I found this killer dealer on a set of wheels http://northmiss.craigslist.org/pts/1305110606.html , but don't the 8 lugs for '99 F250 use that 170?mm stud spacing instead of 6.5"? I really wish they would fit...is there any way it could work?

Re: 8 lug stud spacing
 

Correct they are 170mm. The only way it will work is with adapters

Re: 8 lug stud spacing
 

I saw one time where a guy that had a sweet 91 F-350 had 02 super duty 8 lug alloy wheels on it. The guy owned a machine shop and machined the wheels and added an offset slug that he also machined and was able to bolt the wheels to his standard truck. It seems like a lot of work though.

Re: 8 lug stud spacing
 

It seems to me that 6.5 inch bolt diameter pattern is 165.1mm
And 170mm is 6.69 inch
Therefore the difference in diameter is only .095 inch

10 thousandths is not very much


If my math is correct

The more important question will be if the backspacing is correct.
The high offset wheels have a problem clearing early tie rods and brakes and...


Just my two cents


Mick

Re: 8 lug stud spacing
 

Good input Mick.

Re: 8 lug stud spacing
 

Your metric conversion math is absolutely correct...but the difference is more than you are thinking.
5 millimeters is essentually 3/16"
The difference (english) between 6.5 and 6.69.....is .190 (not .095)
.190 is close enough to 3/16" (.187)
So, what it all comes down to is....does 3/16 matter? IMHO, yes. The wheel "might" physically fit over the lug studs, but the nuts will never tighten properly. They will bind on the edges of the taper before seating. THis will stress the studs.

Of course all of this is moot if the off-set doesn't "work"

Re: 8 lug stud spacing
 

If you tried to run those Ford wheels on an 8 on 6 1/2" hub, the lug nuts would come loose on one side of the truck very quickly.

Re: 8 lug stud spacing
 

I once had a set of 170 mm rims on a 6.5in 8lug chevy (because I was told they were 6.5in) and it had a wicked hop going down the road. So your answer is yes it does make a differance, and belive me when I say this, it is unsafe.

Re: 8 lug stud spacing
 

Yes the difference is .190 but you have to divide by 2 because we are talking about a circle (1/2 as much on each side) so that's how I got .095.

Again all of this math. The real world is something different.

I did bolt on a set of late model wheels on my early model dana 60 no problems with the lug pattern but the offset stopped everything.

10 thousandths is not much in a 6.5 inch diameter space, but are late model truck wheels hub centric or lug centric?



Mick

Re: 8 lug stud spacing
 

xxx

Re: 8 lug stud spacing
 

Blazer1970
OK 10 thousandths is to much and therefore Ford wheels will not fit on 6.5 inch diameter bolt patterns.



Mick

Re: 8 lug stud spacing
 

Have a machine shop drill a new 8x6.5 pattern in between the 8x170 holes.