finally a wheel question

I was wondering if a 15'x7" with a 3 1/2" backspace would tuck on a mazda with 2wd fenders or would I need 4wd fenders? I still have no idea how to measure and thers no fenders at all on my truck right now so I wouldn't be able to anyways.

I really need to learn how to measure offset and backspacing and all that crap.

on a 7" wide wheel you need at least a 5.25" backspacing to tuck on 2wd sheetmetal.

looks like I'm gonna have to find some other wheels then, thanks for the help

Originally posted by hollaitsjosh



on a 7" wide wheel you need at least a 5.25" backspacing to tuck on 2wd sheetmetal.4.5" BS will tuck on a 7" wheel...

Originally posted by DroptSdime



Originally posted by hollaitsjosh



on a 7" wide wheel you need at least a 5.25" backspacing to tuck on 2wd sheetmetal.4.5" BS will tuck on a 7" wheel...

maybe in the front but not in the back. It will hit the bedsides. 4.5 bs is only +12 offset, no way no way no way.

Russ, I went back and read some of your other posts and now have them in a little chart on my desktop so I don't have to ask with every wheel I like

Edited: 3/2/2007 5:23:02 PM by DroptSdime

Originally posted by Russ-D



Originally posted by DroptSdime



Originally posted by hollaitsjosh



on a 7" wide wheel you need at least a 5.25" backspacing to tuck on 2wd sheetmetal.4.5" BS will tuck on a 7" wheel...

maybe in the front but not in the back. It will hit the bedsides. 4.5 bs is only +12 offset, no way no way no way.

My Denalis with a 24.5" tall tire barely touch the bedsides when layed out. I added about a 1/4" to their BS, then did the math to figure out the BS needed on a 7" wide wheel. Sure, it'd still be close to the bedside, but I think too much BS doesn't look good. He asked what would tuck, not what would tuck with a mile clearance.

Originally posted by DroptSdime



Edited: 3/2/2007 5:23:02 PM by DroptSdime

Originally posted by Russ-D



Originally posted by DroptSdime



Originally posted by hollaitsjosh



on a 7" wide wheel you need at least a 5.25" backspacing to tuck on 2wd sheetmetal.4.5" BS will tuck on a 7" wheel...

maybe in the front but not in the back. It will hit the bedsides. 4.5 bs is only +12 offset, no way no way no way.

My Denalis with a 24.5" tall tire barely touch the bedsides when layed out. I added about a 1/4" to their BS, then did the math to figure out the BS needed on a 7" wide wheel. Sure, it'd still be close to the bedside, but I think too much BS doesn't look good. He asked what would tuck, not what would tuck with a mile clearance.



nope. you calculated wrong, a 7 inch wide wheel is actually 8 inches wide. Backspace on every wheel made in the entire world is calculated with this understanding. If you add that extra inch to your calculation (you cant add it to the frontspace, now can you?), and subtract the 1/4 inch you added for safety, you get that a 5.25 backspace will tuck on a 7 inch wide wheel. Exactly what was stated. 4.5 backspace 7 inch wide will chew fenders up. Now a 4.5 inch backspace will work great on a 6 inch wide rim, because its actually 7 inches wide.

Sorry, you just didnt know.

Originally posted by Russ-D



Originally posted by DroptSdime



Edited: 3/2/2007 5:23:02 PM by DroptSdime

Originally posted by Russ-D



Originally posted by DroptSdime



Originally posted by hollaitsjosh



on a 7" wide wheel you need at least a 5.25" backspacing to tuck on 2wd sheetmetal.4.5" BS will tuck on a 7" wheel...

maybe in the front but not in the back. It will hit the bedsides. 4.5 bs is only +12 offset, no way no way no way.

My Denalis with a 24.5" tall tire barely touch the bedsides when layed out. I added about a 1/4" to their BS, then did the math to figure out the BS needed on a 7" wide wheel. Sure, it'd still be close to the bedside, but I think too much BS doesn't look good. He asked what would tuck, not what would tuck with a mile clearance.



nope. you calculated wrong, a 7 inch wide wheel is actually 8 inches wide. Backspace on every wheel made in the entire world is calculated with this understanding. If you add that extra inch to your calculation (you cant add it to the frontspace, now can you?), and subtract the 1/4 inch you added for safety, you get that a 5.25 backspace will tuck on a 7 inch wide wheel. Exactly what was stated. 4.5 backspace 7 inch wide will chew fenders up. Now a 4.5 inch backspace will work great on a 6 inch wide rim, because its actually 7 inches wide.

Sorry, you just didnt know. Actually I know about the extra 1" wheel width for the mounting lips, thank you. The problem came from me doing all the math in my head. I just redid it on paper, and realized what I added wrong. It had nothing to do with the extra wheel width. So sorry to the poster, you would need 5-5.25" BS on a 7" wheel.