"Here�s the important thing: Since the offset is measured from the center of the wheel, the location of the tire tread (the part that can rub) does NOT depend on the width of the wheel, only the OFFSET of the wheel. What does this mean? It means that you can have two wheels, one 7 inches wide, and one 8 inches wide, and if the offset of the two wheels is the same, the tire will be in the same place relative to the fenders. The tire�s side wall makes up the difference between the 7� and 8� wheel. But the tread will be in the same place."

Yes, the EDGE of the wheel sticks out 3 more mm, but the top of the edge of the tire that rubs the fender is actually 10mm closer inward. Because of the 10" wheel vs the 9" wheel, the tire is actually stretched more at the sidewalls, which also helps make it an easier fit. So basically if the tire might be square on the 9" wheel it will be stretched at the sidewalls on a 10". Of course, some people may think a 255 on a 10" wheel is too much stretch, but in using those as comparison, the 17x10 +45 with a 255 is actually easier to fit.

 

Ah I see the logic there

 

Yeah, it took me SO long to understand the whole offset thing haha. So basically to get the stance you want you can either change the offset or stretch tires. Of course, you also have to be cognizant of less clearance on the strut/suspension/control arm side of things..the 10" +45 wheel would have 13mm less clearance on the inside. But there still shouldn't be an issue since it is a +45 offset. When I bought my Downforce fenders I was going to go with a 17x10 +52 6ULR setup but they stopped making them.

Anyways to OP if your rears aren't rubbing you could go with a 17x9.5 +38 setup if you wanted to sell the wheels. This is RPF1s







6ULRs 17x10 +52 with 255s

 

Again, not entirely true. I can repost my argument again if you'd like, but it would just be beating around the bush. When you are concerned about rubbing, you want to locate the tire relative to the fender, not from the center hub, or the inner fender (on s2000s at least since we have a lot of inner fender clearance). A 17x10 +45 will indeed be about 3mm further out than a 9 +35, but if you're running 255s, you will might get enough stretch depending on tire to make that small difference negligible.

In your example, the 8mm wheel will sit 1/2 inch further out than the 7 inch wheel. Offset isn't everything, actually, offset is nothing without wheel width.

To the OP, I am currently running 17x9.5 +35 and +40 Work Meister Monoblocks with 255/40/17s all around on stock fenders. I run the +35s up front because they'll rub in the rear and my alignment is -2.5 up front and -3.0 in the rear IIRC. On the track, the car feels very neutral and easy to control. It's a lot more confidence inspiring than a staggered setup which tends to understeer (might be my driving style and car setup that caused that) and it makes the car less enjoyable. I would keep the non staggered setup, and read up in the Racing and Competition Forum about setting the alignment up correctly to at least get a baseline and then tweak it to your driving style. Also, for what it's worth, my wheels are up for sale/ trade

 

[quote name='clarkster009' timestamp='1317330038' post='21023954']
Yeah, it took me SO long to understand the whole offset thing haha. So basically to get the stance you want you can either change the offset or stretch tires. Of course, you also have to be cognizant of less clearance on the strut/suspension/control arm side of things..the 10" +45 wheel would have 13mm less clearance on the inside. But there still shouldn't be an issue since it is a +45 offset. When I bought my Downforce fenders I was going to go with a 17x10 +52 6ULR setup but they stopped making them.

Anyways to OP if your rears aren't rubbing you could go with a 17x9.5 +38 setup if you wanted to sell the wheels. This is RPF1s

Thats what im running right now +38 R but +28 up front, I wonder if +38 front would fix my rubbing issue, or is that what u were implying?

I really want to keep them i love them but i dont want to have to run so much negative camber nor mess up my carbon fenders anymore.

I wonder how much camber up front i actually have with 30mm over fender to fit the slightly stretched 245 on a 9.5" wheel.

I want to run a 255 x4, maybe doable with 17x9 +35??

 

bumpp tryna make this work, new questionn up top!

 

You are not going to fit a 255 on a +22 offset wheel without rear overfenders. Maybe with like -5 camber but doubtful even then. I would look for either a 10 +45 or a 9.5 +40, as that is more feasible.

 

+22 front with 30mm over fender. not rear.

 

I am saying it might be doable up front with the overfenders but no way in the rear.

 

o ya im aware of that, i would run a +35 rear