12" x 18 rear wheels? what backspace?
#1
Advanced
Thread Starter
12" x 18 rear wheels? what backspace?
hi, i just ordered some intro wheels in 12" x 18" rear and they ask what backspace i want... im nut sure if 4" is ok or should i have 5"? the car has wide fenders and now its got 15" with 285 tires and 1/2" spacer and the wheel looks really bad its like 2 - 3 inches inside from the fender lip... that why i want wider wheels... what would you recomend?
thanks and happy new year
thanks and happy new year
#3
Racer
hi, i just ordered some intro wheels in 12" x 18" rear and they ask what backspace i want... im nut sure if 4" is ok or should i have 5"? the car has wide fenders and now its got 15" with 285 tires and 1/2" spacer and the wheel looks really bad its like 2 - 3 inches inside from the fender lip... that why i want wider wheels... what would you recomend?
thanks and happy new year
thanks and happy new year
#4
Team Owner
6.5 and run 2 inch adapters. Both of my rear wheels 17 and 18 X12 are done this way. Wheel manufactures for strength want the mounting point near the center to the ouside
#5
Safety Car
The simpe answer is..you are going to have to measure something first!
There are too many variables for anyone to give you an accurate measurement here.
Simplest thing to do is take the rear wheel off of your car, put a jackstand under the trailing arm and lower the car down (thus putting the weight of the body on the suspension.
Take a piece of string with a small washer on the end from the top of the rear fender lip and let it drop down so its 3" from the floor. With a straight edge measure from the disc brake hat to the string. Take that measurement an deduct 1". That will give you the front setting of the wheel.
What you need to remember that the backspace and offset are different measurements, so when measuring an 18x12 wheel in backspace terms..its actually 13" wide.
Do that measurement and post/pm me and we can get you in the ball park.
There are too many variables for anyone to give you an accurate measurement here.
Simplest thing to do is take the rear wheel off of your car, put a jackstand under the trailing arm and lower the car down (thus putting the weight of the body on the suspension.
Take a piece of string with a small washer on the end from the top of the rear fender lip and let it drop down so its 3" from the floor. With a straight edge measure from the disc brake hat to the string. Take that measurement an deduct 1". That will give you the front setting of the wheel.
What you need to remember that the backspace and offset are different measurements, so when measuring an 18x12 wheel in backspace terms..its actually 13" wide.
Do that measurement and post/pm me and we can get you in the ball park.
#6
Advanced
Thread Starter
Thanks, with that backspace (which is the one INTRO recomends), would it not touch inside and move the wheel outwards to the fender lip no? or is it the other way around? the more backspave the more the wheels go close to the chassis? (im a bit confused)...
Thanks
Robert
Thanks
Robert
#7
Advanced
Thread Starter
#8
Advanced
Thread Starter
The simpe answer is..you are going to have to measure something first!
There are too many variables for anyone to give you an accurate measurement here.
Simplest thing to do is take the rear wheel off of your car, put a jackstand under the trailing arm and lower the car down (thus putting the weight of the body on the suspension.
Take a piece of string with a small washer on the end from the top of the rear fender lip and let it drop down so its 3" from the floor. With a straight edge measure from the disc brake hat to the string. Take that measurement an deduct 1". That will give you the front setting of the wheel.
What you need to remember that the backspace and offset are different measurements, so when measuring an 18x12 wheel in backspace terms..its actually 13" wide.
Do that measurement and post/pm me and we can get you in the ball park.
There are too many variables for anyone to give you an accurate measurement here.
Simplest thing to do is take the rear wheel off of your car, put a jackstand under the trailing arm and lower the car down (thus putting the weight of the body on the suspension.
Take a piece of string with a small washer on the end from the top of the rear fender lip and let it drop down so its 3" from the floor. With a straight edge measure from the disc brake hat to the string. Take that measurement an deduct 1". That will give you the front setting of the wheel.
What you need to remember that the backspace and offset are different measurements, so when measuring an 18x12 wheel in backspace terms..its actually 13" wide.
Do that measurement and post/pm me and we can get you in the ball park.
Robert
#10
Safety Car
OK, so you have 8" to the fender lip, and you ordered 4" backspace on a 12" wheel.
4" backspace means the wheel will have 9" forward space (a 12" wide wheel is actually 13" wide from outer lip to outer lip) which means the wheel will stick out 1" past the lip of the fenders you currently have.
But hold on...looking at your pictures, it looks like you have the car jacked up on the chassis rail, not the rear suspension, so you will find that if you jack up the rear suspension, the distance from the brake hat to the fender lip will increase (it will come up in an arc, towards the inside of the wheel arch and away from the fender lip) Its going to be very close, but with a little bit of grinding on the inside of the fender lip and not too tall of a tire, you may get away with it.
I know I am running 4-3/4 backspace on my 18x12's, but theres no knowing what flares you have.
Nick
4" backspace means the wheel will have 9" forward space (a 12" wide wheel is actually 13" wide from outer lip to outer lip) which means the wheel will stick out 1" past the lip of the fenders you currently have.
But hold on...looking at your pictures, it looks like you have the car jacked up on the chassis rail, not the rear suspension, so you will find that if you jack up the rear suspension, the distance from the brake hat to the fender lip will increase (it will come up in an arc, towards the inside of the wheel arch and away from the fender lip) Its going to be very close, but with a little bit of grinding on the inside of the fender lip and not too tall of a tire, you may get away with it.
I know I am running 4-3/4 backspace on my 18x12's, but theres no knowing what flares you have.
Nick
Last edited by lvrpool32; 01-07-2013 at 06:07 PM.
#11
Advanced
Thread Starter
OK, so you have 8" to the fender lip, and you ordered 4" backspace on a 12" wheel.
4" backspace means the wheel will have 9" forward space (a 12" wide wheel is actually 13" wide from outer lip to outer lip) which means the wheel will stick out 1" past the lip of the fenders you currently have.
But hold on...looking at your pictures, it looks like you have the car jacked up on the chassis rail, not the rear suspension, so you will find that if you jack up the rear suspension, the distance from the brake hat to the fender lip will increase (it will come up in an arc, towards the inside of the wheel arch and away from the fender lip) Its going to be very close, but with a little bit of grinding on the inside of the fender lip and not too tall of a tire, you may get away with it.
I know I am running 4-3/4 backspace on my 18x12's, but theres no knowing what flares you have.
Nick
4" backspace means the wheel will have 9" forward space (a 12" wide wheel is actually 13" wide from outer lip to outer lip) which means the wheel will stick out 1" past the lip of the fenders you currently have.
But hold on...looking at your pictures, it looks like you have the car jacked up on the chassis rail, not the rear suspension, so you will find that if you jack up the rear suspension, the distance from the brake hat to the fender lip will increase (it will come up in an arc, towards the inside of the wheel arch and away from the fender lip) Its going to be very close, but with a little bit of grinding on the inside of the fender lip and not too tall of a tire, you may get away with it.
I know I am running 4-3/4 backspace on my 18x12's, but theres no knowing what flares you have.
Nick
You think I should go with 12" or should I cancel and let them do 10" instead... I dont mind if I have to change the wide fenders I dont really like them anyway.. have seen much better wide fenders on this forum... and the front wide fender is even worse.. makes the car look tall in front...
Thanks
Robert
#12
Race Director
Got any pics of the car. I run 5 in. Bs on 18x10 and I have seen the same wheels on another Vette with 5.5iin BS. 5 inch to be on the safe side and you have ~7 inches of wheel sticking out from the hat of your rotor.
#14
Advanced
Thread Starter
Sent up some pics so its easier to see what I mean with the fenders... Thats with 15" 285mm wide tyres.. Also send pic of the car and the wheel...
Thanks
Thanks
#15
Race Director
To be honest if the Vette needs paint you might want to go a bit smaller with the flares. They look like the same ones on the front as on the back. Then you can go from there with the tire and wheel combo you want.
If you aren't going to paint it then it will look better with bigger wheels and tires for sure
If you aren't going to paint it then it will look better with bigger wheels and tires for sure
#16
Advanced
Thread Starter
To be honest if the Vette needs paint you might want to go a bit smaller with the flares. They look like the same ones on the front as on the back. Then you can go from there with the tire and wheel combo you want.
If you aren't going to paint it then it will look better with bigger wheels and tires for sure
If you aren't going to paint it then it will look better with bigger wheels and tires for sure
Thanks...
Robert
#17
Team Owner
17 X 12 with 345/35/17
Last edited by gkull; 01-10-2013 at 07:30 AM.
#18
Race Director
Car looks cool with those back flares, the tire is only 26.2" tall but still looks good. I had 345/50/15's on the back of my Cuda ( N50/15's ) in the late 70's
To the OP you say you are paying $800 just to ship the wheels ? I would seriously start looking around your area, there's lots of exotic wheels on that side of the pond
To the OP you say you are paying $800 just to ship the wheels ? I would seriously start looking around your area, there's lots of exotic wheels on that side of the pond
#19
Advanced
Thread Starter
Car looks cool with those back flares, the tire is only 26.2" tall but still looks good. I had 345/50/15's on the back of my Cuda ( N50/15's ) in the late 70's
To the OP you say you are paying $800 just to ship the wheels ? I would seriously start looking around your area, there's lots of exotic wheels on that side of the pond
To the OP you say you are paying $800 just to ship the wheels ? I would seriously start looking around your area, there's lots of exotic wheels on that side of the pond
There are no wheels for Corvette over here... For my Audi there are plenty of wheels in all kind of prices... I can get wheels for new corvettes to C5, C6 but C3.. its even difficult to find a garage where to fix the engine.... And we will see how the paint is coming out..
Thanks
Robert
#20
Team Owner