47-55.1 C4 Vette sub frame & running 4 of the same wheel?

[dsraven]

ok, let me just say that the diameter of the wheel has a little to do with the set up in that the wheel needs to clear the brakes and have the proper backand front spacing that works with the tire outside diameter in order to get the tire contact patch with the road in the correct spot with regards to the rest of the IFS set up. if you think about it you will see what i mean. you could install an 18 inch wheel with a smaller sidewall and end up at the same outside diameter of tire. it is not so much the diameter of the wheel as it is the outside diameter of the tire that is going to affect the alignment. if the offset of the stock wheel, and the outside diameter of the stock tire, are kept to be within reason with the new wheel and tire choice then the alignment and driveability of the truck would be like the original donor car. if you run a taller or shorter tire that the donor or use spacers or a large offset whels to get the wheel further outward in order to get the tire/wheel opening/stance look you want then the alignment is going to be significantly different than the stock donor was and so a difference in alignment and driveability is going to come along for the ride.if you spend some time with the scrub radius link I posted earlier you will see how the different offsets and tire outside diameters will affect the alignment geometry and may have an adverse affect on the driveability. yes, guys do it, yes they will all say it drives like a race car. they just won't tell you the negatives. not all race cars are a dream to drive until they are set up correctly. personally, I would stick with the stock donor wheel offsets and tire outside diameters in order to have the alignment correct because I hate having to herd the vehicle down the road, be affected by every crack or groove in the road surface and never being able to take my eyes off the road for a second to check the radio station or whats in the field next to the road etc etc. change the scrub radius=change how it drives. maybe better, maybe worse. read up on how scrub radius affects steering feedback for a little better idea. talk to a front end alignment guy, do some research before you spend money.
remember, wheel diameter is less important that tire outside diameter. it all works together, wheel outside diameter-wheel offset for the backside AND the front side, rake angle the front end was set up for (which is affected by different outside diameter tires on the front versus the rear).
don't take my word for it, ask a seasoned front end guy who knows, not the wheel salesman, not the tire salesman, not the guy at the car show who has a corvette IFS in his truck that he spent big bucks on, with wheel spacers and big offsets and who says it's the best thing ever but won't look you in the eye when he says that. the front end alignment guy in the know is who to talk to. one from a chassis building shop would be good likely because they would likely have done a few vette suspensions and would know the ins and outs.
just my 2 cents. build it right the first time.