looking to upgrade to some varosteen 15x8 25mm offset ccw reps i have stock suspension not lowered or anything i was thinking of running a 205 55 15 tire on em since they are 8" wide let me know your thoughts ...thanks again

 

25mm might be too low of an offset

 

25mm is way to little offset, guaranteed interference without major fender work.
Stick to 42mm and up to 53 mm (OEM) offset and you waste your time with 8" widr rims that require tires so wide and heavy you lose mpg and performance. Any time over 205 section is wasted.
good luck.

 

im running a 7.5" 17" 42 offset wheel now with a 205 40 tire on it never had any rubbing ever even fully loaded gets well over 30 mpg on avg and ive clocked 43mpg on the highway I tow my 600lb inflatable boat and trailer with the my fit I was thinking that going back to a smaller stock sized wheel might be better than the 17 wheel ...anyway thanks for the input guys ...my next choice was a 15x6.5 wheel with a 35 offset

 

The 35 mm offset is going to be a problem if you pick the wrong tire size.
Your 205/40x17 tires are 23.4" diameter and if your OEM tire was 24" diameter then you were just getting by. Reducing offset more merely pushes your wheel further out where the tire is likely to rub the fender liner.
Remember its the tire that rubs so your choice of tire is critical. The wider the more likely to rub.

 

For fitment issues involving different width wheels, you may find it easier to look at the backspacing, which is the distance from the back face of the wheel to its edge. The formula for an alloy wheel is (wheel width plus one inch)/2 + offset/25.4.

A stock 15x6 wheel with a 55 offset would be (6+1)/2 + 55/25.4 = 5.67". The 15x8 with a 25 offset equals 5.48". Therefore, the innermost portion of the 15x8 wheel (not the mounted tire) is 0.19" farther from the strut, but the outermost portion of the wheel will be 2.19" closer towards the fender. The 2.19 equals the difference in the wheel diameter (8-6) minus the difference in backspacing (5.48-5.67).

 

I think your calculation needs some correction. Divide the wheel width, including rim edge widths, by 2. In your case (6+1) / 2 to get 3.5 + 2.16 = 5.66". Do not confuse that with specification backspace presented by wheel manufacturers Which in this case will be 5.16".
And the backspace specification for the 15x8/25 wheel is 4.000+0.984 = 4.984". The easy measurement is (8+1) /2 + 25/25.4 = 5.484".
Apparently you did right but typed incorrect.


The backspacing has rarely been used in our thousands of wheel/tire upgrading because most of the time the interference occurs on the outsde edge of the tire rather than the inside, thus theoffset which determines the centerline, and thus the outer tread edge distance from the hub face and thus easy to see if the tire will fit.
Used geometry - and you thought it would never be handy - the outer edge of the tread can be caculated from the diameter and tread width of the tire so the measurement from the hub center to the edge can be compared to the available space when the vehicle is lowered to the at-rest height or the height when the spring is fully compressed . (position the vehicle at appropriate heights with a jack under the hub back at the suspension).
cheers.

 

Offset is confusing because it ignores width. People who might not know better might see 15x8 +45 and think they're golden because "+45 offset no rub rule" when in fact it will fit differently than a 15x7 and may rub.

+25 with 8" wheel is aggressive fitment, but it can be done, you will need to do fender work, but nothing fancy.

Looks nice I think but you'll have to be low to make it look good IMO and run a little bit of stretch on the tires, again, nothing fancy.

 

we find backspace isn't easy for customers to relate to rubbing. When we describe offset changes it directly relates to how far the tire moves,. Since almost everyone wants a wider track, reduction in offset is needed. When offset is reduced from 53 to 45 mm thats an 8 mm change outward and we can put a rule on the tire tread and show them how much it changes.Saves a lot of customer regret. That doesn't work with backspcechanges.
As for modifying fenders we have customers sign off on a releasse absolving us of any harm to customer's trade-in or sales value as a result. At least 90 % of the time that stops that tire/wheel mod in its tracks.
As for over wide wheels we show them how wide a tire is needed, how much heavier, how many mpg they lose, and they back the width to do what can be done accurately rather than how 'cute' they'll be. And how much it will cost when they trade or sell. And they show with a lawyer...

 

It will fit I was running 15x8 +15 and they fit fine with rolled fenders and camber

 

i have same wheel spec as yours..and i just out it on today..im on f&f type 2 coil overs..im wondering how you did the front camber with the stock bolts on struts..can you share it? thanks..

 

so i ended up going with a 15x6.5 35mm offset with a 195 55 15 tire so far so good towed the boat twice already and no problems i do notice faster off the line acceleration prob due to less heavy wheels but so far im appy with the way it looks and drives put about 120 miles on the wheels so far and zero issues ...lets say this im glad i didnt go with the 15x8 25mm offset setup because i can see now that i woulda had problems with that set up anyway thanks again for the input everyone