offset math check...think i got it...
#1
offset math check...think i got it...
ok. so i'm thinkin i MIGHT have my head around all this offset stuff.
right now i have OEM rays. so the rear would be like this...
factory:
8.5 in
+33 offset
with 25mm spacer:
8.5 in
-the 25mm spacer = +8 offset as my CURRENT OFFSET.
now if i got a 9.5 rear to have a similar fit as i do now...
9.5
+8 being my current offset + half of 1" being 12mm = +20
and if i wanted to get a 10.5 rear with similar fit...
10.5
+8 current offset + 1in/25mm (half of the 2" wheel width gain) = +33
is that right?
i'm trying to figure all this stuff out thru my own homework...and i THINK this makes sense in my brain. but then i start thinking about lip size and stuff after going to a wider rim, then wonder if the offset changes it's "zero position" when it's wider, like if i go 2 inches wider does that put an inch on each side or all to the outside?...............now i'm confusing myself again.
your help is appreciated. thanks!
right now i have OEM rays. so the rear would be like this...
factory:
8.5 in
+33 offset
with 25mm spacer:
8.5 in
-the 25mm spacer = +8 offset as my CURRENT OFFSET.
now if i got a 9.5 rear to have a similar fit as i do now...
9.5
+8 being my current offset + half of 1" being 12mm = +20
and if i wanted to get a 10.5 rear with similar fit...
10.5
+8 current offset + 1in/25mm (half of the 2" wheel width gain) = +33
is that right?
i'm trying to figure all this stuff out thru my own homework...and i THINK this makes sense in my brain. but then i start thinking about lip size and stuff after going to a wider rim, then wonder if the offset changes it's "zero position" when it's wider, like if i go 2 inches wider does that put an inch on each side or all to the outside?...............now i'm confusing myself again.
your help is appreciated. thanks!
#2
Registered User
iTrader: (43)
Almost, you had the stock wheel + spacer correct but a 9.5 or 10.5 wheel may have a different offset so adding a spacer to that offset will give you the correct number. Example 20x10.5 + 33 subtract your 25mm spacer leaves you + 8 offset. Another example 19x9.5 + 17 subtract your 25mm spacer leave you. with -8 offset.
#3
but i was basing that off of my CURRENT offset. like on my 10.5 example, the +33 i came up with would put me at the same fitment as my CURRENT fitment, WITHOUT spacer.
sorry guess i didn't make that clear, those later numbers are what i would want to fit similar to my CURRENT setup, but WITHOUT spacers.
sorry guess i didn't make that clear, those later numbers are what i would want to fit similar to my CURRENT setup, but WITHOUT spacers.
#4
Make it easier on yourself.
http://www.1010tires.com/wheeloffsetcalculator.asp
Zero offset is dead center of the rim. The numbers that you are getting ( +8, +19 etc) is the amount that the mounting surface is "offset" from the center of the wheel. So you are correct in your thought. If you have a 8" wide wheel thats +0, making that wheel a 10" with the same offset would add 1" to each side of the mouting surface.
http://www.1010tires.com/wheeloffsetcalculator.asp
Zero offset is dead center of the rim. The numbers that you are getting ( +8, +19 etc) is the amount that the mounting surface is "offset" from the center of the wheel. So you are correct in your thought. If you have a 8" wide wheel thats +0, making that wheel a 10" with the same offset would add 1" to each side of the mouting surface.
#5
here's a qucik overview on how to figure out offset on a wheel. good to know if you've ever bought used wheels where the stickers were removed or barrels have been changed out.
How to measure offset
How to measure offset
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