Notices

How do I choose a size and offset

Thread Tools
 
Search this Thread
 
Old 11-08-2005 | 12:33 AM
  #1  
Short_Bus's Avatar
Thread Starter
Senior Member
10 Year Member
5 Year Member
SL Member
 
Joined: Nov 2004
Posts: 527
From: Maryland
Default How do I choose a size and offset

I know this is a dumb question I have looked, I no find. I am getting a set of NKB cups. I am wondering if I do a 15x9 if that will fit, the offset is 30. Also will a stock tire fit on that or would it have to be massively stretched. ALSO would I have a better more flush look with a 16x8 with a 35 offset. Thanks again if you have pics that would help me alot
Old 11-08-2005 | 12:34 AM
  #2  
Short_Bus's Avatar
Thread Starter
Senior Member
10 Year Member
5 Year Member
SL Member
 
Joined: Nov 2004
Posts: 527
From: Maryland
Default

O yea also lowered on tanabe df's
Old 11-08-2005 | 04:49 PM
  #3  
RTon20s's Avatar
Senior Member
10 Year Member
5 Year Member
SL Member
 
Joined: Oct 2005
Posts: 2,066
Default

Let me first say, that I am not a big fan of the JDM style, or VIP for that matter. And tire stretching and flush fitment are far from my favorite. I do know that on a 7" wide wheel you need at least a +35 offset to TUCK your wheels on an xB.

If you were to run the 15"x9" wheel with a +30 offset your wheel would be about almost 1-1/4" from tucking. And it would be over 3/4" further into your wheel well also. This could cause conflicts with suspension components, etc.

The 16"x8" wheel with a +35 offset sounds like a better fit in my opinion. The wheel would be about 1/2" from tucking (pretty flush) and would be 1/2" further into the wheel well. This still may present a conflict with suspension components. Narrow spacers could easily solve any of those conflicts.

Now as far as tires, there is no way I would try and stretch a 185/60/15 onto a 9" wide wheel. Stretching a 185/60 onto a 7" wide wheel is pushing it in my opinion. I wouldn't go wider than a 6.5" wheel on the stock tire. And I will not recommend a stretched tire size on any wheel.

If you want to run a 15x9 and maintain the stock tire diameter I would go with at least a 225 tire. A 245 would probably be more appropriate. A 225/50/15 could work well and provide a slightly stretched look. A 245 would work better width wise, but finding a tire with an aspect ratio to match the stock tire diameter is tough.

If you need a lower profile to work with the DF210s you could switch to a lower profile in the same width. A 225/45/15 is over 3/4" smaller.

Now on the 16" wheel, I would stick with a 225 width. A 225/45/16 would be slightly taller than stock and a 225/40/16 would be almost 3/4" smaller. If I were looking at wheels in the sizes you were, I would favor the 16x8 with +35 offset wrapped in 225/40/16 rubber.

Good luck in your search.
Old 11-09-2005 | 12:00 AM
  #4  
Short_Bus's Avatar
Thread Starter
Senior Member
10 Year Member
5 Year Member
SL Member
 
Joined: Nov 2004
Posts: 527
From: Maryland
Default

I am just confused about tire width. I don't want to stretch a tire, way to risky for all the driving I do. I just want to make sure I can get the max. witdth and lowest offset without rubbing or having to mod anything. Any help with this?
Old 11-09-2005 | 12:24 AM
  #5  
sexyscionlover's Avatar
Banned
10 Year Member
5 Year Member
SL Member
 
Joined: Jun 2004
Posts: 2,490
From: Middle of Nowhere
Default

on a 9 inch wheel, you're going to have to stretch otherwise you're gonna have a hella wide tire that wont fit your car really.

we've all been over this, but stretching is NOT as dangerous as you think it would be (dont argue here, seriously) but i understand if you dont want to. you can do an 8 inch wheel with a little stretch othewise you're going to want a 7.5 inch rim or smaller. probably

Heres a basic breakdown from what I know:

on a 7.5 inch rim 15 offset is flush! (theres varying levels of flush though for some)

so on an 8 inch rim, 20 would be about flush

on a 9 inch rim, 30 or so would be flush

thats basic breakdown. if you have any questions, feel free to PM me and I can help you out some more.

Scott
Old 11-09-2005 | 05:41 PM
  #6  
RTon20s's Avatar
Senior Member
10 Year Member
5 Year Member
SL Member
 
Joined: Oct 2005
Posts: 2,066
Default

So looking at the information provided by you, sexyscionlover and myself, here is what I gather.

The best bet of the two wheel options you listed would be the 16x8 with +35 offset. With that I would run a 225/40/16 tire. Now these won't be flush, but you have options. According to scionlover you need approximately 15 mm less offset. I am not sure if that is front or rear, so we will assume that is in the rear.

To get that extra offset I would run a 3/8" OTG hub spacer in the rear in combination with one of their 3/16" wheel spacers. This would push your wheel out an additional 14.29 mm. In other words you would have given yourself +20.71 offset. If you need less offset you could always run a 3/8" wheel spacer in lieu of the 3/16" spacer.

In the front if you need additional offset you can run the same aluminum wheel spacers. Your options are 3/16" or 3/8", just as in the rear.
Old 11-09-2005 | 06:38 PM
  #7  
sexyscionlover's Avatar
Banned
10 Year Member
5 Year Member
SL Member
 
Joined: Jun 2004
Posts: 2,490
From: Middle of Nowhere
Default

yea basically 16x8s with 35 offset and some OTG spacers would be pretty damn hot!

the front will look about flush without that extra 10mms or so since the rears have wider flare on the back.
Old 11-10-2005 | 02:38 AM
  #8  
Endless4LIFE's Avatar
Senior Member
5 Year Member
SL Member
 
Joined: Nov 2004
Posts: 124
From: Bay Area, CA and OC, LA
Default

First off to start with backspacing issues, 15x9 +30 is not a good way to go. You will surely have issues with the Macpherson style suspension we run on our cars.

I ran Blitz Z1's in 17x8 +32 on my car and it was pretty near my coilovers. This is what i'm basing it off of. to get the same backspacing as the 8" +35 you would need to run a 9.0" +22 You will also potential have a problem hitting your inner fender under full lock even tho your tire might be the same as stock tire diameter. The wider the wheel the more likely this can happen in the front.

If you're looking to run a stretch fitment you would need to lower that 9" offset to about a +25 for the front.. The rim lip will stick out a little from the fender compensated by negative camber and/or a stretched tire. For tire size it can get pretty tricky with these small diameter wheels, because the sidewall profiles are so tall. In order to get a good stretched look out of a high profile tire you will need to get something that has a stiff sidewall, hence higher speed rating. A tire like this would be the Yokohama ES100.

My suggestion would be, if you must run 9.0's, to run something in a low 20's offset and run a 205/50/16 on there. Look for a tire with a V Speed RATING so the stretch looks proper, not bulgy.

I can calculate this further on my vehicle to get you exact specs if you desire. Dave/Mem Fab is like 5minutes from me so I have Dave's NKB info as well and can look into the available offsets to see what will work for you.

I do have some 16x8 AME wheels, PHAT lip, two piece forged wheels that we're offerring partial sponsorship opps on in the event that the NKB isn't made in the right fitment.

In the rear I'd run like a 9" +15 to +20 depending on your fender roll.

Ok, hit me up bro. I'm super wheel mathmetician and am down to offer my help to any guys who need it. I'll break it down and explain it in lamen's terms so you can get a grasp of "WHEEL FITMENT TECHNIQUE". Stretching tires changes the whole formula as it's really dependent on the tire brand/model/ and size you choose.

Definitely sounds like the guys above know what's up with how width and offset are dependent on each other. For exact calculations surely PM me as i'm doing this ____ all day anyway. Doing my own car would be no problem. hehe.

Not to mention that I have a ton of 15's, 16's, and 17's in stock. But all 8.0" wide with like +15 rear and +25 front.

Peace, Rishie
Old 11-10-2005 | 07:06 AM
  #9  
Endless4LIFE's Avatar
Senior Member
5 Year Member
SL Member
 
Joined: Nov 2004
Posts: 124
From: Bay Area, CA and OC, LA
Default

Forgot to mention that this is primarily an issue in the Front of the vehicle. That's what I've based my 9" limitations on. If the wheel isn't offerred in the appropriate offset then you do have the option of purchasing studded spacers to move the wheel out for the front and then OTG or studded spacers for the rear to get that out more. We're running 8.5 +10 in the rear with complete fender roll, or 9.0 +16 in the rear. For the front I've found that 8.5 +25 is flush with the front fender with a minor stretch. If you go to a 9" then a +30 is the natural option to retain the same frontspacing. The only issue is the inner clearance/suspension clearance. That I would feel better measuring for you just so you know it will be ok. If it works 9" +30 front, then get a 15mm spacer for the rear and roll your fenders. Then run the 205/50 on that sucker and OMG you will have a fitment I have not tried yet. lolz. It would be sick.

Rishie
Old 11-10-2005 | 07:41 AM
  #10  
stankubrick's Avatar
Senior Member
10 Year Member
5 Year Member
SL Member
 
Joined: Sep 2003
Posts: 984
Default

Rishie is right on....

I've got 16x9 +30 205/50 all around. OTG rear spacer shims were neccessary to avoid rubbing the stock suspension - 16x9 +15 would have beeen ideal for the rear. I'm flush all around with no need for negative camber, but I had to do major fender rolling and a little trimming up front (due to 3+ inch drop). ...Pics in my profile...

If you go 15x9 205/50, I'd suggest at least a 3.5" drop or you'll have a gappy gap.
Old 11-10-2005 | 09:27 AM
  #11  
Endless4LIFE's Avatar
Senior Member
5 Year Member
SL Member
 
Joined: Nov 2004
Posts: 124
From: Bay Area, CA and OC, LA
Default

Sweet ness. Damn Rico guess i haven't seen these wheels yet. I'll check out the pics.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
rain7905643
Scion tC 1G Forced Induction
7
03-14-2015 12:48 AM
meechindisbeech
Scion xB 2nd-Gen Wheel & Tire
12
02-28-2015 04:20 AM
avus
Scion xA/xB 1st-Gen Wheel & Tire
14
08-06-2004 09:27 PM
bBted
Scion xA/xB 1st-Gen Wheel & Tire
9
10-04-2003 11:15 PM



Quick Reply: How do I choose a size and offset



All times are GMT. The time now is 03:40 AM.