I have the same setup as must, 19x9.5 +12 offset with 245's and 19x10.5 +12 on 285's with a 5mm spacer coming soon. The stretched tires will help with the car when its dropped...

Hey MUST where from So cal you from?

I don't really understand what these offsets do. My basic understanding is the higher the +##, the farther the rim sticks out from the hub? I see these stock offset numbers, and these other numbers, and really am not able to put it together all too well. I dislike rolled fenders, I despise negative camber and I don't care much for rubber band looking tires or stretching them to the point where a 45 tire looks like a 25.

So, If i were interested in Forgestar F14's, what sizes should I look at since they have a certain range of max/min offsets available, assuming a slight drop on coil overs and camber adjustments/parts to zero them out? Ideally I would like 275 front and 305 rear. Is this a pipe dream? I little help would be appreciated. As a side question, how deep would the concave be? DDM's don't look too deep, but it could be the angles.

Thanks in advance.

I am going to see what I can do to help you and to help explain the concept of offsets to you...

The lower the offset the closer the face of the wheel is to the center of the car. The higher the offset the further the face of the wheel is from the car. Camber is your friend and I stress camber is your friend and should be used in moderation just like anything. Camber will increase your tire's contact patch in a turn thus giving you more turn in response and grip. All of the offsets I just posted a few posts ago will work with -2.5f and -2R camber the front is fairly aggressive but the rear is tame when it comes to camber. I would not buy forgestar! Members like caravan and others have had major issues with quality and delivery times. Being quoted 4 weeks delivery and then not receiving them in 20 weeks makes you reconsider your purchase! They have major issues with colors being consistent! If you want to know what sizes fit try to stay as close to offset as the past couple posts.

Helpful post... just ordered some 19x9.5 +12 for my 350z (front rims), came here specifically to see if I would be able to use these wheels if/when I upgrade to the 370z. I'm running 19x10.5 +22 in the rear, sounds like I might need a spacer for those.

Do you have any pics of this setup?

for the 350z, i thought the flushest offset to use without rubbing is +22 front and rear? so having +12 in the front of a 350z will make it rub, no?

btw, does anyone have any pictures to go with their offsets, it would probly make things easier to explain. I understand the concept but I probly need more. when we put a 20mm spacer on the front wheel, technically its the same as a +27 right (+47-20=+27)?

Yes you are correct!

so the recommendation of +12 f/r means, the new wheels will technically sit 35mm outwards of the normal wheels? thats pretty much isnt it? i thought the 20mm spacers is already the limit without rubbing..

You can run negative camber and keep it from rubbing... what most people do is add the spacer but try to retain stock camber and alignment. that is why they rub...

I don't know that much about wheel sizes & I hope I'm posting this in the right thread, but after my recent accident I'm alittle nervious and have a question. Would a 285 or 295 tire in the back be ok with the stock 19" rims & maybe a 255 tire in the front. If so does anybody know which tire I should go with. I'd appreciate the help, after the accident I now know how Important suspension/tire/brakes upgrades are.

...oh and was thinking of getting the eibach springs & 15mm front/rear spacers (not sure if I need them tho)

our rear wheels are 10" wide so you can effectively run either 285 or a real meaty look with 295.

Eibach springs are great for looks and will only help lower the cars center of gravity and thus leading to less body roll. 15mm spacers will work just fine :tup:

I hope this reassures you that you will be ok running that setup ;)

mmm 295

Awesome, I'm going to go with the 295's cus I just got in an accident and want the most grip/traction possible. So 255/40/19 for the front & 295/35/19 for the rear would be good? Would a possible 15mm h&r spacer all around cause any rubbing? Since the car would be lowered and all.

Despite the common perception, wider tires won't give you more grip. They'll just change the contact patch shape if you don't change the weight of the car.... Read this: Car Bibles : The Wheel and Tyre Bible Page 2 of 2

http://www.carbibles.com/images/contactpatch1.gif

295 and 255 is the route i went... what's the offsets of your wheels again? are they the stock ones?

^oh you did go with 255/295, I plan on keeping the stock Nissan sport rims. Any suggestions for tires? I found some bf-goodridge tires, but others have said they would be too loud.

Am I good with this setup?

18x9.5+22 275/40 -1.4° (stock arms in front)
18x10.5+15 295/35 -1.9° (SPC camber arms rear)

I believe the rears are good, may even need a spacer but I'm not sure if the front tires are going to rub at that width and wheel offset. Hoping not to step down to 255 instead. Thoughts?

Edit: I went with the 255 fronts, 275 would have needed a lot more negative camber and I don't have front camber arms, so I'm stuck at -1.4°. The rears don't need a spacer, they're perfect.

This thread needs pics for the noobs like me :D With and without spacers etc.

Great thread btw.

Chris

if a friend want to run 19x11rear with 305 tires what size of tire he have to choose 305/??/x19, and what is the best offset and camber he need???

Ok offsets will depend on how aggressive you want to be. We know that a 12 et+0 will fit and so will a 11 et-5 but that's on the very aggressive side of the spectrum. Most people are runnin 11 +5 with 305 tires. And I "think" you can run a 305/35/19 on that wheel too. Someone correct me if I am wrong.

cause we think that the set could be 19x11 +28, with tires 305/35/19 like u said, but no idea with the camber

what does it mean?

19 x 9 +47
19 x 10 +30

i am assumin 19'? and what are the other numbers?

Yes mean 19 inches

Front: 19*9.5 +25
Rear: 19*10.5 +5

Will the rear rub with a 285 tire with stock allignment (no negative camber or drop) How about with a 295, or 305? I really don't want to have to mess with getting camber arms and all that if i dont need to. any insight?

wow +5 is cutting it close but i dont think it will rub without a drop but put it in H&R spring territory and you will have a problem

the wheel is actually +15 but need to clear the rear caliper with a 10mm spacer. I'm a bit confused tho. some people say that lowering the car on springs will actually help to tuck the wheels in more, other say it will cause rubbing.

19 = your wheel diameter
9 or 10 = your wheel width
+47 or +30 = you offset

Offsets can often be displayed as negative numbers as well.

I hope that helps.

Lowering helps but also can hinder your clearance... this is where your tire size and actual tire widths come into play. The offset game is not an easy one and many people do not understand it at all. I have been doing this for years and I still find myself learning new stuff every day.


If your rim is very wide your tire will actually stretch making the tire appear as so / \ if the tire is too fat it will look like this ( ). Lowering helps when your tires look like / \ but if your tires look like ( ) then you either need to get wider rims, thinner tires, different tire brand, pull the fender or get suspension parts to help you gain more adjustability.

Im about to take delivery on a set of wheels which specs are:
20 x 10 +21
20 x 11 +11
Will front and rear match in terms of aggressiveness? Im worrying that i might need a spacer in the rear after reading through this thread :P


Edit: What tire sizes should i use?

using the sport package stock stance as a reference, your outer position of your front wheel will stick out by 39mm further than stock (you will also have 13mm MORE inner clearance)
the rears: the outer position will extend out an extra 32mm further than stock with 6mm MORE inner clearance)

sport package wheels are 9" +47mm / 10" +30mm. using the site below, you can compare the offset and sizes of the sport package wheels to anything you're thinking of doing

http://www.1010tires.com/wheeloffsetcalculator.asp

If your up to it Juruki I would recommend a 5mm-10mm spacer in the rear, You can run 255 up front and 305 in the rear.

Juruki's rear wheel at 11" +11mm has the same outer position as my 10.5+5 and you are recommending a spacer? guess that means i am safe from rubbing issues with my 10.5+5 if i run a 285/295 in the back

Ohhh yeah ur safe!

I thought even a 8.5 width, +45 mm wheel could clear that rear caliper. Is that not the case?

thx for the quick help!
So 255/35/20f and 305/30/20r
or 255/30/20f and 305/25/20?

the offset doesn't really affect the caliper clearance, its the style of the face and the thickness of the hub mounting surface.

The thickness/length of the hub mounting surface is dictated by the wheel offset...

your right and to further clarify offset is a by product of that hub thickness ;)

this thread just helped me a ton... with my rear camber kit I'm now pretty sure I can order the 10mm spacer for the rear on the new wheels I am getting that are:

19x9.5 +17
19x10.5 +18

Going with 245/40/19 up front and this sits very flush if not a "smidge" more than I'd like and 10mm in rear should even out the wheels so it looks like it should.. 10mm spacer essentially turning the offset to +8 on a 19x9.5 or 5mm spacer to +13 ... 275/35/19 in the rear... buying them with 285/40 and 255/40 but taking them off because tires are mis matched and I have a brand new set of stock size nt05's

The tires will be a little strestched for now until I buy the next set but should help with fittment and me getting an idea of what will fit with and without camber adjustments.

Can you take some pics of the setup on the car? I considering a set of 18x9.5 +15 & 18x10.5 +15, just concerned about the front's being a bit too aggressive. Planning on 255/45/18 & 275/40/18 tires.