new wheels and tires

[ZEPHYR]

Hello all,
I was wondering if anyone would know what the measurements for the bolt pattern and what the off set is for the stock rims on my early 85 svo are. I want to get new tires and rims for my car and have picked the ones I want but my car is not to the point that I can run it over to the local tire store. So if I can get the measurements that I need then I can just go in.
Thanks
Chad

[SVOeric]

tire size is 225 X 50 X 16
the rims are 16X7 -5.625 offset
the bolt pattern is 5 on 4.5 (I believe -- someone double check me on that)

BUT --

the things you need to look out for are -
make sure the hole in the center of the wheel is large enough for the hub to fit through

Make sure the center caps will fit on the wheels -(the center hub sticks out rather far on SVO's

SVO Rims are what is called hub-centric -- the hub holds the wheel centered, and the lugs just hold the rim on
A lot of rims are lug-centric -- meaning the nuts hold the rims centered, and tight against the rotor. You can swap to the other style without causing problems, but you do need to make sure you have the proper lug-nuts for the wheel you have.

[CP86SVO]

Should be 5.625 inch backspace. Bolt pattern is correct... WS

[svono50]

Alright boys and girls, lets put on our wheel terminology hats for a minute. The reason I bring this up is because I have had issues in the past in talking to wheel shops by talking about measurements. The terms "offset" and "backspacing" cannot be used in place of one another when talking to a wheel shop. Why? Manufacturers use those terms for specific measurements and they are do not reference the same thing.

The Tire Rack website has some great info on the subject (see link below), so I won't waste any more time on that.

http://www.tirerack.com/wheels/tech/offset.htm

Onto Chad's question about our SVO wheels:

Wheel size; 16" diameter, 7" width
Bolt pattern; 5 lug x 4.5" diameter
Wheel backspacing; 5.75"
Wheel offset (est); 43mm

Here is the info from a '96 Cobra wheel (what I have on my car):

Wheel size; 17" diameter, 8" width
Bolt pattern; 5 lug x 4.5" diameter
Wheel backspacing; 5.75"
Wheel offset; 30mm

[AT6svo]

To simplify and add a correction:

Backspacing = Distance from mounting surface to INBOARD side of rim.
Offset = Distance from mounting surface to the CENTERLINE of the rim.

94-96 Cobra Wheel
Ford PN M-1007-C178
5 lug 4.5" Bolt Center/Pattern
17" x 8"
5.72" Backspacing

not that .030 makes much of a difference. fyi most SN95 wheels (tri-bars, the split 5 spokes, and older cobra (94-97) wheels use the 5.72 bs)

and for SVO wheels:

Originally posted by CP86SVO
Should be 5.625 inch backspace. Bolt pattern is correct... WS

is correct NOT 5.75" !!!!!!!!!!!!!!

-mike

[northernsoho]

Wheels on a members SVO

I was looking at the member's cars and Jim Caraco '86 SVO has some wheels that look great. Does anybody know what wheels they are. They look similar to some AT Italia that I saw in a magazine.

Thanks Bob

[jacaraco]

I'm Jim and the wheels are BBS Moda M1 that I bought used for $300 with less than 1000 miles on them. They are 17 x 8 made for an SN 95. The guy I bought them from had a GT traded for a Corba that he put those wheels on hardly drove it and then bought a Z3 2.8. I bought them 6 - 7 years ago and have 235/40-17 tires on them. 2 lbs heavyier per wheel than stock (wheel tire/ combo). Rougher riding for sure. I need new tires and will go with taller ones to help out the ride a little. I love the look of the wheels. I don't think that style is available any more as I had to spend $125 to straighten one I bent because Tire Rack didn't have any more. I had to cut the back of the center cap to get it to fit over the front bearing cap. In the spring I will powdercoat the wheels a little darker color as the light silver shows brake dust in about two miles of driving. Hope this answers any questions you might have.

[northernsoho]

Jim's Wheels

Thanks for the reply Jim. I have been making myself crazy trying to figure out what wheels I want to put on the car. I have an '86 that is in the shop getting painted the same Charcoal Metallic. AT Italia S Razze looks very similar to your wheels. The edges on the cobra r are a little to square for me and I think that the style on your car look good with the rounded edges. I also like the thickness of the spokes and I also prefer the finish to the chrome finish. When I look at a mustang with the chrome finish my eyes are initially drawn to the wheels instead of the car as a whole. It has been two weeks with our the car and I have been driving our Ford conversion van and I don't know how much longer I go with out it. I am actually having dreams about driving the SVO.
Thanks again. Your car looks great.

Bob

[jacaraco]

I'm Jim and the wheels are BBS Moda M1 that I bought used for $300 with less than 1000 miles on them. They are 17 x 8 made for an SN 95. The guy I bought them from had a GT traded for a Corba that he put those wheels on hardly drove it and then bought a Z3 2.8. I bought them 6 - 7 years ago and have 235/40-17 tires on them. 2 lbs heavyier per wheel than stock (wheel tire/ combo). Rougher riding for sure. I need new tires and will go with taller ones to help out the ride a little. I love the look of the wheels. I don't think that style is available any more as I had to spend $125 to straighten one I bent because Tire Rack didn't have any more. I had to cut the back of the center cap to get it to fit over the front bearing cap. In the spring I will powdercoat the wheels a little darker color as the light silver shows brake dust in about two miles of driving. Hope this answers any questions you might have.

[svono50]

I just had to post a reply to Mike's (AT6svo) message about the SVO wheel backspacing. Our wheels have a 5.75" BS, not a 5.625" BS.

Here is a link to an excellent diagram as to how backspacing and offset are calculated/measured:

http://www.ttrsracing.com/fitmet_diagram.htm

Most wheel manufacturers now use offset measurements rather than backspacing in their specs. It is easier to compare wheels using the offset, rather than backspacing IMHO.

[bigwingsaleen]

wheels.....

Use the application for a '93-up Probe GT, that is the correct backspace/offset for the SVO. Useing a FRONT WHEEL DRIVE application due to the width addition of 4-wheel disc rear and Lincoln front suspension.

Two items of caution:

1: check fit before mounting tires due to the hub diameter, no pevious replies have noted this.

2: check fit of the center cap due to the hub nut/cotter pin sticking out of the wheel.

Good Luck!

[svobud]

Re: wheels.....

Originally posted by svogary

1: check fit before mounting tires due to the hub diameter, no pevious replies have noted this.

Actually, both of those is what Eric was talking about with the "hub centric" reply (very first one).

[AT6svo]

Originally posted by svono50
I just had to post a reply to Mike's (AT6svo) message about the SVO wheel backspacing. Our wheels have a 5.75" BS, not a 5.625" BS.

Here is a link to an excellent diagram as to how backspacing and offset are calculated/measured:

http://www.ttrsracing.com/fitmet_diagram.htm

Most wheel manufacturers now use offset measurements rather than backspacing in their specs. It is easier to compare wheels using the offset, rather than backspacing IMHO.

Allrighty, to quash this FOR ONCE and FOR ALL.

The link you listed states the same thing I had in my earlier post. This is a direct quote from Mustang Performance II by William R. Mathis. For those in the know, it is commonly referred to as "the bible" of mustang suspension.

Backspacing = distance from the axle mounting surface of the wheel to the outside lip

Offset = distance from the axle mounting surface to the centerline of the wheel

On page 147 of the Mathis book, shows a 16 X 7 SVO wheel being measured for BACKSPACING. And I quote, "This SVO Mustang wheel measures APPROXIMATELY 5.65" of backsapcing."

I just went out to the garage and measured FROM the axle mounting surface to the wheel lip a distance of 5.75", hence 5.75" backspacing, so I stand corrected.

The big question is now is THE FACT SHEET ON THE SVOCA HOME
PAGE INCORRECT!! First terminology wise, Second on the actual measurement!

I'm curious to know where that info came from.

[svobud]

Originally posted by AT6svo


The big question is now is THE FACT SHEET ON THE SVOCA HOME
PAGE INCORRECT!! First terminology wise, Second on the actual measurement!

I'm curious to know where that info came from.

I do believe we used Ford published information, but yes .. it should have read 'backspacing' - and not offset. The offset is somewhere in the 40-42mm range.

[frankiesaysrelax]

Originally posted by AT6svo
Allrighty, to quash this FOR ONCE and FOR ALL.

The link you listed states the same thing I had in my earlier post. This is a direct quote from Mustang Performance II by William R. Mathis. For those in the know, it is commonly referred to as "the bible" of mustang suspension.

Backspacing = distance from the axle mounting surface of the wheel to the outside lip

Offset = distance from the axle mounting surface to the centerline of the wheel

On page 147 of the Mathis book, shows a 16 X 7 SVO wheel being measured for BACKSPACING. And I quote, "This SVO Mustang wheel measures APPROXIMATELY 5.65" of backsapcing."

I just went out to the garage and measured FROM the axle mounting surface to the wheel lip a distance of 5.75", hence 5.75" backspacing, so I stand corrected.

The big question is now is THE FACT SHEET ON THE SVOCA HOME
PAGE INCORRECT!! First terminology wise, Second on the actual measurement!

I'm curious to know where that info came from.

So is this settled? What are the officially agreed upon measurements? Are there any plans to update the fact sheet?