32x10.5x16's

[don4331]

My 265/65R16s are on the stock 16x7 rims pinched off my '99.

Offset is either 6 or 12mm, center bore is 70.5mm

 

[sumncguy]

Ok gents .. here is the real deal. As I mentioned earlier, I have had many 4x4s but not raised like this. I think we are taking about a total 7" lift. 4 suspension, 3 body.

So the object is to not screw up my refreshed front end .. you can see what I did here .. https://www.therangerstation.com/forums/index.php?threads/92-4x4-ball-joints.189944/page-2#post-1798609

I want to reduce the stress on the front end to some degree by probably going to a larger rim with a tire that isnt as wide or tall. .. and yes .. I do see those body bushings .. Eeeeuuuww ! those need to go.

Lets here it .. those 16" that were shared look ok .. not sure how small a tire/wheel I can go with before it looks like one of those low rider trucks ..

 

[sumncguy]

Hey maybe you guys can help me with one of these dimensions I dont get.

I understand ..
the higher the negative offset measurement the further outward from the fender the wheel sits.
the higher the positive offset measurement the closer to the suspension the wheel sits.
the hub bore is understandable ... especially with 4x4 manual hub .. allows the hub to fit through the Rim.
15x8 is easily understood .. Diameter and width
5 on 4.5 is also easily understood. Basically lines up rim holes with studs on the spindle

What the heck is backspace ? Seems the same thing as offset to me. Guess that old guy sumtimers is kicking in !!! Suppose I have a block !

Thanks in advance fellas !

 

[ericbphoto]

Offset measures distance from mounting surface to center if wheel. Backspace measures from mounting surface to rear flange.

 

[sgtsandman]

Backspace and offset are different measurements for the same thing. Since some rim specs only list one measurement, it helps to know both to see if the rim will fit. Like mentioned above, backspace measures from the back of the rim. Offset measures from the mounting surface to the center line and can be positive (toward the outside of the center line) or negative (to the inside of the center line). Both measure the position of the mounting surface in relation to what they are measuring from.

To confuse it even more, offset is usually in metric and backspace is usually in inches.

 

[sumncguy]

I ordered Pro comp 51s -19 MMS offset 3.75 backspace and Kuhmo 32x11.5x15's

 

[don4331]

So, @sgtsandman, I learned something tonight from your diagram, thank you

I couldn't figure out why my backspace numbers were off, when I measured: One needs to measure to the outer edge of the rim as backspace is including the material of the profile.​

Using @sumncguy rims:

3.75in back space, -19mm offset, and the other values we know - 15" diameter and 5 x 4.5 pattern; we can also assne they are "J" profile rim (as 99.99% of North America car and light truck rims are "J" profile) and J Profile has width of 0.5625.

So, based on numbers -19mm offset = 0.75"

Rim width = (Backspace - Offset - Profile) * 2;
Rim width = (3.75 - (-0.75) -.5625) * 2 = 7.875...I'll bet they call them 15 x 8 rims.

 

[pjtoledo]

So, @sgtsandman, I learned something tonight from your diagram, thank you

I couldn't figure out why my backspace numbers were off, when I measured: One needs to measure to the outer edge of the rim as backspace is including the material of the profile.​

Using @sumncguy rims:

3.75in back space, -19mm offset, and the other values we know - 15" diameter and 5 x 4.5 pattern; we can also assne they are "J" profile rim (as 99.99% of North America car and light truck rims are "J" profile) and J Profile has width of 0.5625.

So, based on numbers -19mm offset = 0.75"

Rim width = (Backspace - Offset - Profile) * 2;
Rim width = (3.75 - (-0.75) -.5625) * 2 = 7.875...I'll bet they call them 15 x 8 rims.

I've got the offset and back space, can you explain the J profile a bit more? never seen a value attached to it.

EDIT: after searching the J is the shape of the flange(s) still didn't see a value associated with it. must be a standard for it someplace.

 

[don4331]

I've got the offset and back space, can you explain the J profile a bit more? never seen a value attached to it.

EDIT: after searching the J is the shape of the flange(s) still didn't see a value associated with it. must be a standard for it someplace.

SAE J1986 defines the shape of the flange, you can also find it in the Tire and Rim Association, Inc, Yearbook. (price of the former is $83 and later $125).

Not many uncontrolled copies available on web.

 

[sgtsandman]

I had the offset measurement reference points incorrect and I’ll correct my post to reflect that.

The credit for the diagram goes to ericphoto and not me but thank you.

 

[ericbphoto]

I had the offset measurement reference points incorrect and I’ll correct my post to reflect that.

The credit for the diagram goes to ericphoto and not me but thank you.

I just Googled it