DoWork2day

Oh, by the way I have since read all the back/forth with madmax/stephen regarding their opinions on spacer danger. I figured there was a risk to breaking something, not sure I still think so unless someone has broken one or knows someone who broke something while launching under power.

83 Crossfire TA

iTrader: (2)

What are you going to break?

Spacers are thicker than the hubs of most wheels and when you bolt wheels to them you'll end up with an assembly that has the same offset as the correct offset wheel, so it's not like you're going to put more strain on the bearings, spindles, whatever...

The only valid arguments that I can come up against them are:
- the whole assembly is typically going to be heavier than a wheel with the right offset and no spacer
- you end up with 2x as many studs/lugnuts meaning more work and more places for a monkey to screw things up
- If you like deep dish rims then obviously you're not going to get as deep a dish

DoWork2day

I am concerned about the 10 lugnuts per wheel, more there to break. Having a 2 inch spacer wouldn't concern me as much as bolting a 5 lug adapter to the hub, and then bolting 5 more lugs to the adapter. I would think the adapter might be the part to break, not so much my car.

wnhurst

greezemonkey ... Did you do any mods to fit this large of a tire? i have 28x10x15 and they want to rub on the outside. especially if someone sits on the passenger side.

greezemonkey

iTrader: (14)

wheres it rubbing, the spare tire well?..I had 29x10x15 on a stock one, bumpstops cut off and spare tire well dented in to clear...5.5 backspace wheel

wnhurst

The tire rubs the outer fender lip. When it is sitting I can stick my finger between the tire and fender but if someone sits in it or driving and hit bump or something it rubs. I will put them back on and see what my backspacing looks like again. I don't want to cut on it or beat on nothin.. lol.. Thanks

greezemonkey

iTrader: (14)

yea you need more back space, bet you have 4.5 or 5 inch BS, 5.5 or even 6 should get you inside the well..maybe new shocks would work too

wnhurst

You are right. I have a ton of room for more backspace. I see where those bump stops could be in the way. lol. I am sure you quoted your wheel size but don't have time to read back thru. how wide is your rim and what is the backspace of the wheel in your pic? you have any more pics of your car?

greezemonkey

iTrader: (14)

mines a 10 inch rim with 5.5 back space, the rearend is cut down three inches as well.

FlyHiFlyLo

17x9 with 5" backspacing (+.50 offset) with 295 40 tires. Will they fit front and rear with no spacers?

Where will they hit? I have a BFH.

83 Crossfire TA

iTrader: (2)

a 9" rim with 5" bs should be pretty close to 0 offset, and that should fit on the front, but might need a little grinding to keep the tie rod from contacting.

.50 what unit offset?

FlyHiFlyLo

Inches. But the rear will be fine?

//<86TA>\\

iTrader: (14)

those wheels will fit fine, but i dont see the 295 fitting in the front and not rubbing.

and yes, a 17x9 with 5" of backspacing, is zero offset. Not .5 +/- anything

FlyHiFlyLo

Thanks... Where will they rub? because I'm building road car for 24 hours of Lemons and can clearance if needed.

83 Crossfire TA

iTrader: (2)

who even makes a 295/40-17???

the answer depends on if you have a 0 offset or a .5" offset. If it's really a 295/40 on a 0 offset it will be too tall and hit the front and back inner fenders when you turn the wheel, even the appropriate height tires that wide they're likely to rub front and back when you turn the wheel.

Back- if it's 0 offset then they will probably stick out a little but be OK, .5 they will look better but you'll need to hammer the inside front of the wheel well.

corlando52

iTrader: (1)

WOW! Lots of information here. I didn't know I would start such a hot thread. However, back to my original question. If I'm reading everything right, I can take the 15" GM turbo cast wheels off a TA (which I believe are 7" deep), and replace my 14" GM stock turbo cast wheels that came on the car, and use 215/65/15 tires instead of my 205/70/14 tires, with no spacers needed. It should be a quick swap, with no rubbing issues.
Is that right? Oh, and thanks for all the comments and info. You guys are great!

Chris

Fire"Dutch"Bird

iTrader: (1)

Trevmust

What about 17x8's?

Fire"Dutch"Bird

iTrader: (1)

Nobody knows torque specs, or does nobody here uses a torque wrench to tighten their wheel bolts/nuts...??

CrAlt

The torq specs would depend on what the rim is made of and the manufacture of that wheel specs.

xxbrew1690xx

If anyone has run the setup 17x9.5 in front and 18x10.5 in the rear. what size spacers would i need and would 295/35/18 work with minor hammering?

b3x87

iTrader: (1)

i need ur help i have brand new xxr 962 5x120.65 all 18' 9.5 all 4 with +35offset will be fine to fit? i know front must 245 and rear 275. i only worrying if they will fit as well?

ringo234

Even if you knew the correct offset and backspacing all the IROC replicas I've only sell one size for front and back and I know they're different.

hamaf

EDIT: had to delete this comment. I get it now.. :-D sorry for stupid comments..

hamaf

EDIT: had to delete this comment. I get it now.. :-D sorry for stupid comments..

Rodzilla67

Do you think 19x8 - 5x114.3 bolt patterns +45 offset would fit properly to my 1990 Firebird Formula (stock)? I know bolt pattern is correct its the offset that confuses me. Any help is appreciatted!

//<86TA>\\

iTrader: (14)

actually thats the wrong bolt pattern, that a 5x4.5 pattern. we use a 5x4.75 or 5x120.65 bolt pattern.

offset is wrong too, you would need a 45mm thick bolt on adapter

mojo_jojoe4

All of these calculations confuse the heck out of me. Does anyone know if these would fit?

http://www.summitracing.com/parts/mbw-23199/overview/

Would they require adapters? I was looking at these and 275/40 for them. I don't have any suspension mods with the stock rear.

87FBTA

Hey guys,

Great site, I spend more time on here than Google....

Just have a quick question, I think I know the answer, but wanted to throw it out to the forum to make sure.

I can pick up a set of C5 replica wheels from a friend off his vette, for a smoking deal.

They are 17x9.5" front and 18x10.5" back.

Will they fit my 87 Trans AM with some spacers and fender rolling?

92RumbleBee

need to know for the rears i swap my rear end for a 4th gen 1996 camaro posi and looking for new meats want the widest and thinking to roll fender if needed to. Im looking to get Motegi Racing MR224 2PC rims probably 15' or 17' which either looks best. but since it added two inches on each side it actually through me off and im not good with rim back spacing and all yet. so what im asking is what info am i looking for or will say when ordering it? i know bolt pattern but rest is all over the place. so please help!

camaroman83

okay so has anybody out there ran 265/50/r15 if so do you have any pictures? and will they fit okay on a 15x8 inch wheel and under the wheel well of a stock 83 z28 camaro?

Openears

I recently bought an 84 sport and wasnt sure how i could make a 17X9.5 rim fit with an 7.38 backspacing i was wondering how i could make this fit. If i need a spacer what size and any recommended brands

mp6

Hey quick question. I just ordered new rear wheels after allowing my friend to borrow my prostarts who did not use shanked lugs and ruined my wheels. Long story short i had to buy new wheels but I wanted to make sure I bought some that would work with my set up.

I run a 28x11.50 15 Hoosier QTP

The wheels i Bought are as follows : Weld Prostar 15X9 4.5 RS 4.75Bolt pattern

My axle is a stock width IROC axle.

mmadden55

Here is a very helpful link, it lets you compare stock to whatever and tells you what the difference is and what if any spacers are needed. It also will let you compare anything to anything else tire and wheel wise.

http://www.rimsntires.com/specspro.jsp

tpala225

Hello, i have a 89 rs with drum brakes in the rear,Will 87 iroc 16 inch rims fit?
i know the original wheels on the car have a 4.50 back spaceing and the iroc rears are 5.25 and the fronts are 4.75 will i have any caliper,drum,or wheel well problems
thanks for your help

happyhapka

so on a wheel that's 17X8 with a offset of 15 what size wheel spacers front and back will I need for proper fitment?

tcntx

i have a 1992 trans am with the gold offset oem wheels 16 x 8
what is the max tire size can i put on that wont rub?
the stock tire size is 215/60r16
and at that max size how far off would my speedo be ?
92 ta 305 700 trans
rear drums lsd
all stock

Wildfongkyle

I have a 91 IROC will 245/30r20 fit?

Flat-twin

Hi, is there somewhere an illustrated list of factory rims with their dimensions and tire dimension used on it ?
I'm still looking for Firebird formula wheels and I was proposed twice another model in 16" which are not the exact model but I don't know the dimensions at all. I know they where Pontiac wheels but that's it.

Those are the wheels I'm looking for (16", different ET on front and back I think, I don't know the width) : concave shape; rim edge + holes (WS6 wheels).
I found this :
Wheel Part Number: OW1661 FRONT
Size: 16" x 8", 5 Lug, 4.75" Bolt Pattern

Wheel Part Number: OW1662 REAR
Size: 16" x 8", 5 Lug, 4.75" Bolt Pattern



Those are the 15" from regular Firebird that I could easily find and bought (I'll check the width and ET) : concave shape, no rim edge.
Wheel Part Number: OW1372
Size: 15" x 7", 5 Lug, 4.75" Bolt Pattern




Those are the one I was proposed : convex shape and small edge.
I just know they are 16" rims but I don't on which exact model they were mounted.


I'd like to know the exact sizes of the last one with the ET. I'm sure it will fit but I'd like to have an idea on how it will look on the car regarding the width and the look against the fenders.

I found something here : http://www.tacreationsusa.com/firebird_wheels.htm

1badcj8

I just checked this out... VERY good tool. I learned more from this in 10 min than 3 hours of searching for it... Excellent tool actually

rmc9173715617

Need your recommendation, please. I have a 1986 Camaro, 5.0L, 305 cu in, VIN H with an OEM stock steel rims 15x7? with P215/65R15 tires mounted on them. I plan to buy & replace them with a used 1982-92 Z28 15x7 factory rims and put a new wider tires. Do you think the Z28 alloy rims will fit to my car? What wider tire specs I can mount? And what aftermarket branded mag alloy wheels I can use if I opt to buy new. (I just subscribed to your informative Wheels & Tires Forum)
Thanks for your tech assistance.

1986 Camaro Sport Coupe OEM stock steel rim (15x7?) with P215/65R15 tire.

GreggChester

Hi - the previous owner of my car changed the rear end from 3.08 to 3.42. I wanted to put aftermarket rims on it anyway, so I thought it might be easier to fix the speedo error resulting from his diff change by getting rims/tires with an overall diameter that's 11% larger than factory rather than fart around tearing out the speedo gears and changing them. I worked up the attached, but I the list above suggests maybe I can't go that tall. Can anyone comment on max overall tire diameter or point me to the right info? Thanks.

theblackknight

Ok. This could be a stupid question but I figured I'd ask anyways. I have been trying to find some wheel spacers for my camaro and everywhere I look, the fitment info on all the spacers say they will fit the rear but not the front hub. Can anyone tell me why this is? The spacers I'm looking at fit all the parameters (70.3 center bore, 5x120.65, 12x1.5 studs). I'm confused.

Thanks

LAFireboyd

iTrader: (3)

Just guessing based upon my own experience with spacers, but it could be because the center bore of most spacers is "stepped" like in my picture below. I had to have these bored deeper into the spacer to get the long nose of the front hubs to fit all the way through them.


3rdgen rear hubs are similar to front and rear hubs on 90s and later cars, such as 4thgens and Corvettes, where the hub doesn't pass all the way through the spacer. But 3rdgen front hubs will have to pass all the way through the spacer, and that inner step is likely to prevent that, so the front spacers would have to be bored all the way through, or close to it, which is probably going to require direct correspondence with the manufacturer of the spacers, where the two of you could go over possible options, one of which might be a complete through-bore + a wheel centric ring between the wheel and the spacer.