I'm in the process of building my 1st camaro,it's a 92 rs.I'm looking at putting a set of 18x8 front and 18x9.5 rear on it..my question is what's the bs I need.the cars stock height and brakes.I do not want them out from under the wheel wells..just not my thing

 

i have 18x8 front with 4.5 bs and 18x9 with 5 bs. fit perfectly..follow link in sig for pics.

 

Be smart and buy 4 wheels in 18 by 9.5. You can rotate them that way which will allow you to save money on tires. You can do 17 by 9.5 (I did, o well) but the clearance between the fronts and the outer tie rod end is very close and requires attention.

 

Agreed.

Not only rotate, but there is an important advantage of having a 275 width tire up front (compared to a 245), the extra width will give you better braking and handling - in 99% of the cases.

 

Trying to decide between 18 or 20 in iroc..think they are 8 in wide...nothing set in stone yet..still window shopping wheels,brakes ect

 

There is a downside to having a 275 up front. Any bump, dip, or uneven section of the road pulls the wheel much harder driving around town if the roads are subpar. It can make the car a handful to drive somewhere as simple as your daily commute to work. That's part of the reason why I took the 275s off the front and put 225s on (the other reason was to save a some money and combined weight from wheel and tire.)

 

If that's your own personal experience I won't argue it, but my personal experience has not been that way. My car is lowered an inch or so and I only have rubbing of the wheel to the well when the steering wheel is fully turned. You should be able to set toe in 3/32" and that alone usually helps a grey deal with wandering and darting. A few members have 18x10.5 up front. I'm sure Paul can tell us what the weight difference of the wheels are from 8" wide to 9.5" wide.

 

I would argue as well. I ran 295's up front for quite a while and had no problems with the cars tracking or pulling/wandering on the road. 275 will be fine and i will also agree with the others here, use 4 identicle wheels and tires so you can rotate them.

 

I've never had my car on the alignment rack because I can't get it onto the one at work, it may be clear the hell out of line for all I know. When I put wider tires on the front of my foxbody it did the same thing, even after I aligned it.

If the general experience from the majority of others is different from mine, disregard what I said.

 

Park on a flat slab and you can easily set toe with a ruler or micrometer, a thin string or fishing line and some patience and careful measurements. Mine drives straight. Camber gauges are pretty inexpensive too.

 

Typical wheel is about 1.5 to 1.75lb difference moving from an 8" wheel to a 9.5" one. Tires could be another 1 to 3lbs - depending on brand and style.

Having a 225/275 stagger is going to be a handful in turns - major mechanical understeer. I would never suggest trading that for less "wandering" to anyone.

 

18's are about at big as you want to go on a thirdgen. 20 will look a little "donk".

I strongly urge you to consider any advice from Paul. But I will suggest this, if the car will be used for drag and you can be responsible in corners so you don't go sliding into a guard rail or ditch, then the 225/275 staggered will work. The narrow front will reduce roll resistance and the of course the 275 rears will give you more traction, but the staggered 225/275 set up will hurt your cornering.

 

I don't have a problem with 275's in the front.
Before the extensive restoration began, I drove it rain or shine on terrible PA roads.
Only problem with the 275's is they aren't big enough.... planning to stuff larger tires on all 4 corners.