Wheel back spacing
- Thread starter Hanley Noel
- Start date
xcmountain80
Expedition Leader
Yes that makes sense. This is why, I had the OE 4Runner rims on my 4Runner that were 16x7 4.5 or 4.25, and tires ran to close to the upper BJ, I used a 1" wheel spacer to kick them out. I bought a set of LX450 wheels 16x8 3.50, 3.75 BS and eliminated the spacers altogether. So the OE wheels were 4.5 BS include 1" wheel spacers put them at 3.5, same as the lx wheels. So with this line of thinking you are correct in thinking the other will suck in.
Aaron
Aaron
deadbeat son
Explorer
Actually, with a 7" wheel and the same backspacing you'll be tucked in only 1/2" not a full 1". I'd love to see those Tundra steelies on yours
How's that? A 16x8 with 4.5" backspacing would have an additional 3.5" of rim on the opposite side of the mounting surface plane. A 16x7 with 4.5" BS would only have 2.5" of wheel on the opposite side of that plane.
Pskhaat
2005 Expedition Trophy Champion
Hanley Noel
Observer
ok so ~1in. in everyone's opinion would that be too much?
xcmountain80
Expedition Leader
I lost track of the ultimate goal, you want the tires tucked or poking?
Is this for articulation or for aerodynamics?
Help me I'm lost.
Aaron
Hanley Noel
Observer
The ultimate end goal is to have 255/85's on 16x7 steel wheels that don't stick out past the fenders (flares removed) at all. With that said, the wheels should be at the maximum width to retain stability. Make sense?
So the question is...what is the correct backspacing/offset to meet the goal? Tundra steelies are 16x7 w/ 4.6" backspacing. Will those sit too far in?
So the question is...what is the correct backspacing/offset to meet the goal? Tundra steelies are 16x7 w/ 4.6" backspacing. Will those sit too far in?
Hanley Noel
Observer
Didn't really want to run spacers. 1" spacers would push the wheels back to stock, correct?
Hanley Noel
Observer
can you link to some good spacers?
this stuff is confusing for me, sorry.
are the tundra steel wheels w/o spacers is a bad idea? If you could create the perfect 16x7 wheel, what would the backspacing be? 4"?
this stuff is confusing for me, sorry.
are the tundra steel wheels w/o spacers is a bad idea? If you could create the perfect 16x7 wheel, what would the backspacing be? 4"?
deadbeat son
Explorer
It would depend on the application. What are the width and backspacing of the factory wheel? 16x8 with 4.5"? If so, then yes, a 16x7 with 4" of backspacing would net approximately (within 1/20" of an inch) the same ratio of backspacing to whatever the opposite of backspacing is. (Frontspacing?) Look at it as a ratio -- 4.5:8 is approximately the same as 4:7 (if I performed my algebra correctly.) This should keep the weight of the tires distributed over the bearings per the design of the factory engineers.
Personally, I don't care for spacers, but that's just my preference.
Hanley Noel
Observer
Ok. Using the info you just posted the Tundra wheels (16x7 4.6backspacing) are no bueno. Looks like I'm going to Stockton for some custom wheels.
Pskhaat
2005 Expedition Trophy Champion
Non-US LCs got 5.5, 6, and 6.5" (newer) rims. IIRC, they're all nearly at 0 mm offset (?) and thus sit further inward anyway. The big hullabaloo on 'mud is that the pre-91 cruisers required a maximum of 3.5" backspacing to clear steering components.
The bearings take it on two parts, one is from the offset (91-97 =0mm) and the other is kingpins during turning which you want to have the contact patch in the same location as you bump up in tire size. That angle is roughly in front of and centerto the contact patch. It is very hard to get both of these correct.
It is a matter of aesthetics more than anything at this point. If you want your tire absolutely flush with the side, you may need a ~1" spacer. As for components, the inside tire wall should be the ~ same plane as the 275 tire that came stock. I've run many spacers to correct for the above, but I also prefer greatly the look of an OEM tire where some folks do not.
The bearings take it on two parts, one is from the offset (91-97 =0mm) and the other is kingpins during turning which you want to have the contact patch in the same location as you bump up in tire size. That angle is roughly in front of and centerto the contact patch. It is very hard to get both of these correct.
It is a matter of aesthetics more than anything at this point. If you want your tire absolutely flush with the side, you may need a ~1" spacer. As for components, the inside tire wall should be the ~ same plane as the 275 tire that came stock. I've run many spacers to correct for the above, but I also prefer greatly the look of an OEM tire where some folks do not.
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xcmountain80
Expedition Leader
I used and wheeled some cheapo Chinese made no doubt units from eBay. Spidertrax makes them as well. http://www.spidertrax.com/s.nl/sc.2/category.169/.f as my brother has run them without issue.
Aaron
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