Offset help?
 

I'm looking to buy forgestar f14s and don't want a too aggressive fitment. I would like to get 20x9 or 20x9.5 front and 20x11 R with a 255/35/20f and 285/30/20r. So far I'm going to keep the stock height suspension and camber. I want offsets that are close without rubbing and not quite flush, what offsets should I go with? Please help!

Talk to getyourwheels. They will set you up.

http://www.the370z.com/wheels-tires/...p-concave.html

Use this to calculate offsets.

Custom rims, wheel tire packages for your ride - RIMSnTIRES.com

This is a good read.

http://www.the370z.com/wheels-tires/...e-spacers.html

I've used all of these before just wondering how accurate this calculator is?

I was thinking +30f and +28r

I think its accurate. Just measure your stock rims and how far they are from the edge of the fender (~20 mm I think) and then use the calculator to give you the offset that gets you close to the rim.

Getyourwheels said +20f +15r which is flush but is to aggressive for what I want.

+30 front will be sunken in a bit (3 mm), but you can use a slightly wider tire to to get it more flush.

The + 28 rear will be slightly more sunk in then the front (8mm), so a small spacer might be needed.

Those will stick slightly past (2-5 mm). The rear wil look better as it wil stick out less. You might have to stretch the tires a bit.

Tires you are looking at are pretty wide for a conservative set up. They wil definitely stick out a touch even with your desired offsets.

Just went out and measured I have 15mm up front and 19mm in the rear.

What do you think I should run for tires? Drop it down a size on F & B?

So maybe +23 or +24? The front sounds good! And I think +30 is the highest I can go without hitting the brake calipers.

According to the rimsNtires.com offset calculator I can do a 20x9 +33F with a 245/35/20 and a 20x11 +20 R with a 285/30/20. Front will extend 14mm and rear will extend 15mm. But the Nissansportz.com offset calculator says the front will extend 14mm the same as the rims and tires offset caculator but the rear says it will extend 23mm, so 8mm more than the other calculator did, doesn't make sense!

The nice thing about rimsNtires.com is that it shows how far the tires will stick out so you can play around with the tire width. You also got to make sure that the overall diameters are not too different rear to front.

Hmmm. That's different from what I measured on pre 2013 models, maybe they changed something on the front. Didi you lay a thin flat object across the diameter of the wheel and measured from that?

I can't recall the stock rim sizes. I have them at work. I'll check for you tomorrow.

Yes, I used a level. That's the only thing I can think of is that maybe Nissan changed the offsets on the 13s wheels.

Thanks! I think the sport wheels are 19x9f +47 245/40/19 & 19x10r +30 275/35/19 at least 09-12 my13tires are the same maybe the offsets are different, I'll see if I can find anything on that.

:tup: Thanks for this.

Now if I can figure out how to decipher it. :icon17: So many numbers.

Same numbers I have seen. Like I said - not sure about 2013-14.

Anyway here as some numbers with different tire options and offsets. I ran your desired offsets and getyuorwheels recommendations. The difference in tire numbers is obviously by how much the tire sticks out past the lip.

Fronts:

255/35/20x9 +30
Will stick out 22 mm farther then stock.
Wheel diameter 686 mm (679 mm stock)
245/35/20x9 +30
Will stick out 17 mm farther then stock.
Wheel diameter 680 mm (679 mm stock)

255/35/20x9 +20
Will stick out 32 mm farther then stock.
Wheel diameter 686 mm (679 mm stock)
245/35/20x9 +20
Will stick out 27 mm farther then stock.
Wheel diameter 680 mm (679 mm stock)

Rear:

285/30/20x11 +28
Will stick out 7 mm farther then stock.
Wheel diameter 680 mm (675 mm stock)
295/30/20x11 +28
Will stick out 12 mm farther then stock.
Wheel diameter 686 mm (679 mm stock)
305/30/20x11 +28
Will stick out 17 mm farther then stock.
Wheel diameter 692 mm (679 mm stock)

285/30/20x11 +15
Will stick out 20 mm farther then stock.
Wheel diameter 680 mm (675 mm stock)
295/30/20x11 +15
Will stick out 25 mm farther then stock.
Wheel diameter 686 mm (675 mm stock)
305/30/20x11 +15
Will stick out 30 mm farther then stock.
Wheel diameter 692 mm (675 mm stock)

285/30/20x11 +23
Will stick out 12 mm farther then stock.
Wheel diameter 680 mm (675 mm stock)
295/30/20x11 +23
Will stick out 17 mm farther then stock.
Wheel diameter 686 mm (675 mm stock)
305/30/20x11 +23
Will stick out 22 mm farther then stock.
Wheel diameter 692 mm (675 mm stock)

Hope this helps.

:tup: it does help thanks! i just got off the phone with Forgestar and they recommended 20x9.5F +25 with a 255/35/20 and a 20x11R +20 with a 295 or 305 tire. I'm still going with a 285 though

Let us know how it works out.

I will! Thanks again for your help!

Make sure you don't go 35 series front and 30 series rear that will lead to this since the front tires overall diameter will be larger than the rear

http://www.the370z.com/brakes-suspen...t-do-i-do.html

I would go 20x9.5 (+20) with 255-30-20 front and 20x10.5 (+15) with 285-30-20 rear if I was choosing this wheel

Not questioning just trying to learn.

How come the stock wheels are 40 in the front and 35 in the back? Those are different, should they not cause a similar issue?

Is it because you want to keep the rear and front diameters similar? Aren't the numbers I ran within reasonable limit?

All depends on the sizing, VDC is generally happy if you can maintain stagger with the fronts being less than 1% greater than the rears

The stock setup of 245-40-19 and 275-35-19 rear is .5% larger in the front which will not be detected by the VDC/TCS

255-35-20 & 285-30-20 is 1.1% larger in front which could possibly risk the VDC/TCS going off with

Best way to be safe is to use a tire size calculator:

Tire size calculator

Reference:

Will these tires work with my VDC enabled car??? Read HERE! - MY350Z.COM Forums

Thank you.