im tryi9ng to figure out this stupid backspacing offset bullsh*t and i cant understand it i have mickey thompson on my truck now there 15x10 and i have 35x12.5 inch tires on there my back tires stick out about an inch and a quarter my front stick out about 1.75 inches. i wana get cheap cragars for my truck so i can put my 37's on the 37's are 37x12.50 i wana get cragar 17x9 but i dont know what offset and backspacing to get because its so d*amn confusing i just want my tires to stick out just as far as they do now can anybody help me out? and i know there is probably a post already on backspacing so you dont have to inform me there already is one...i would just like some plain simple answers thank you

 

if your rims now have stock backspacing then it is like 5 inches i believe

 

you likely have the 4.5 inch backspacing....I think stock was 5.5...I have had both and the 5.5 actually had more clearence between the tire and fender when turning....but the tire was closer to hitting the suspension components...I have the 4.5 on there now and my tires stick out an inch or so more...

 

Backspacing is really quite simple, it just sounds confusing.

It is basically the distance from the inside mounting pad of the wheel to the outer (inside) edge of the wheel (hahahah, confused more yet?).

For simplicity, if you want your "new" 17x9 wheels to stick out as much as your current wheels 15x10, then measure the backspacing on your current wheels and subtract one inch for the backspacing on the new wheels (due to being an inch skinnier).

A common backspacing for a 15x10 wheel is somewhere around 4", and if thats the case you will want more like 3". But, good luck finding that in a 17" wheel... I don't think it is very common.

 

For simplicity, heres a pic of how to measure backspacing.




And again, whatever the backspacing of your current wheels is, you will want to subtract 1" for the new wheel backspacing, as they are 1" skinnier (if you want them to stick out the same distance).

 

yeah i can only find them in like 4.5 backspacing it sucks i want my truck to sit nice and wide still i found 17x8 with 4.5 backspacing and the 17x9 is 5 backspacing which i dont think will be enough

 

They wont stick out nearly as far as your current wheels. But in all honesty, thats a good thing.



Oh, and fixed my backspaing picture in the post above.

 

yeah i love how my truck looks from behind when you drive behind it it looks just nice and high and wide like a friggin beast lol this sucks i ordered the rims there 17x8 with 4.50 backspacing =[ owell its just for now so i can get my tires on anybody have pics of the same kinda rim size and backspacing with 37s i could see?

 

keep in mind the less the backspacing is the closer the outer corner of the tire will come to the front fender when turning....thats an issue im now having with only 35"s and a 4inch lift notw that i went from 5 to 4 backspacing on top of 8 to 9" wide rims...

 

I second that.


My 12" wide aluminum wheels only had 3 5/8" backspacing... I could almost rub 33's with 6" of lift. It might look cool sticking out like that, but it makes it much easier to rub the fenders, and makes for much more stress on the wheel bearings, ball joints and steering components.