how thick of wheel spacers are safe to run in the front on an FC?

 

The smaller the better. You need to make sure you still have plenty of thread engaged on the stud. So, with stock studs...I'd say 5mm. If you get the longer ARP studs, then maybe 10mm. I would not go bigger than that on a stock hub, as you will no longer be engaged with the centering ring on the hub, and all your weight will be suported solely by the studs...and that is very dangereous.
-a

 

i have 25mm spacers, but they are a little different then the thin versions in how they connect.

 

nice spacers: https://www.rx7club.com/showthread.php?t=517525

i have 25mm as well, I don't race with em but they are cool for pimpin around town

 

doesnt it put stress on the hub if you offset the wheel outward? wouldint it put stress on the suspention and bushings by shifting where the weight rests?

 

With any spacer, you should have a minimum of 6 to 7 full turns on each lug nut.

So if you use the stock studs and a 5mm spacer you will not be able to get those 6 full turns on the lug nut.

Of course when using a 25 mm spacer you are using sumpliental studs or have way extended the stock studs with aftermarket ones.

 

possibly but i would see how the stress would be any diffierent than a really offset wheel that doesn't need a spacer.

i think the major stress comes when the spacer is not hubcentric. I would feel comfortable doing just about anything with the spacers listed above as everything is ABSOLUTELY centered.

good luck, have fun

 

the 25mm spacers arent just slip on. they have there own studs and cover up the old ones. so i guess 3-5mm spacers? or for the 6 full turns how thick must they be?

 

that makes enough sence. hubcentric. if thats a word. that makes sence

 

The weight of the car is not supported on the little hub lip or by the studs bending or anything like that. It's supported by the clamping force of the studs pulling the wheel and the brake rotor face together. The friction between them supports the weight of the car. Spacers are perfectly safe to use, even if they aren't hubcentric. Hubcentric wheels are just to make it easier to get the wheels on and off while being centered. Not all cars have hubcentric wheels (so I've heard).

A racer who's a freind of the family uses 1" spacers that aren't hubcentric, he's done so for years and years without issues, and that's with 9" wide slicks on a GT3 car.