My calculation are different than yours. The stock front rim is a 17x7+55. Widening it to 10.5 is adding 3.5 inches which is 88.9mm divide that by half is 44.45mm add the stock +55 off set so the rim would be a 17x10.5+99.45 offset. A 20mm spacer will make the offset +79.45 and a 25mm spacer will make the offset +74.45

Is this correct?

So the 25mm spacer should be good for 275/40/17. I do not run to roll the fenders but I will if I have to. I absolutely will not run rear fender flares as I do not want to mod the body. I also of course don't want issues with rubbing on the inside.

 

why are you trying to run 10.5 on the front? on the rear I totally understand but the front you should just run a 9. the front has to have more clearance for turning. I thought the ap2v2 were actually 7.5j but they may be 7j (its actually 7j, rear ap1 wheels are 7.5j) you could add a 25mm spacer and widen it to 9j and run a 255 no problem.

 

Calculations are correct, go for the 25mm spacer.

He is moving the rear 8.5" to the front and putting the 10.5" widened front wheel on the rear.

 

Sorry I was basing my calculation off widening the rear 8.5 +65 wheel. I wouldn’t widen the fronts 3.5". Id just pick up another set of rears and run them up front. Widening will be cheaper and easier to balance the wheel so your chances of getting a better product is higher when said and done.

8.5 +65 up front. 10.5 +65 rear. The fronts you should go with a 5mm spacer making it a +60 and this will also negate the need to bore the hub. Bolt on and go.

 

I wouldn’t take this approach for this mod for said reasons above. But also the final fitment won’t be as good. 10.5 +74 in back is cutting it too close. Not enough inner clearance.

 

Is it a must to widen the back wheels instead of the front? I wanted to widen the front because by doing that I wouldent have to soured another set of wheels.

 

Call Weldcraft or who ever your having do the widening and tell them the option you have presented in front of you, and ask them what their confidence level is in adding 3.5" vs 2" to the wheel as well as cost difference. Then weigh that out with the alternative. If you do decide to widen the 7" I would strongly recommend you bump up the spacer to a 30mm.

 

Off topic. But do you still run the kumho xs in 295-35-17? I ask because it seems as if they are discontinued? Cuz no one has them. And these were the only street tires in that size.

 

Off topic. But do you still run the kumho xs in 295-35-17? I ask because it seems as if they are discontinued? Cuz no one has them. And these were the only street tires in that size.
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Yep I appear to be on the last set in America, with about 70% tread left My hope is that with the new XS replacement in 2014 it will be available in that size and when I need it. My back up plan should that size be discontinued for good (which I’m not counting on yet) is to step up to the more available 315/35/17 for the rear, this means however that I would now need to cut my rear quarters and run some over fenders, probably Spoon as they are the most appealing visually to me for a bolt on option. This means also that the front fenders will need to have a wide option as well to be functional and visually appealing to the rear, so that tire availability is really going to push me into a wide body option depending on its status. The other option could be switching to an 18” for the rear, but it has its own considerations as well. With any luck the new XS replacement will be here next Spring/Summer as anticipated and they retain their size line up.

... Or I could just run around on the Hooser DOT slicks that still come in that size