I didn't drive it. So didn't completely settle the suspension. That's probably about right. So they is the wrong wheels? I measured 3/4 of an inch past fender

 

I had TSW’s (18”/19” Interlagos) as my first set of ‘aftermarket’ wheels and they fit and looked great. I had an itch for a 5 spoke wheel so I sold them and bought a set of Forgestar CF-5’s. I liked the design but did not like the ‘poke’ F/R so I sold them. Gave Forgestar a second chance and bought the F14’s hoping they would not stick out past the body - I was wrong and sold them too. Decided to go custom fit and be done with the ‘70/‘80’s look and ordered a set of Forgeline wheels according to their specs/suggestions. Perfect fit finally with a 18/19 setup.

Moral of the story… find a wheel setup on another C5 that you like the look of and go for it. You get what you pay for at the end of the day.

 

putting a straight edge vertical on your wheels and measuring to the fender will show your ‘poke’ (that’s assuming your tire does not stick out beyond the edge of the wheel.

 

"Wrong wheels" is relative. You don't like the poke so they are "wrong" to you. If you don't like them then do as the seller says and bring them back to correct the offset issue which will mean new wheels.

To have an 11" wheel extend 6mm inward and 6mm outward compared to a 10.5" +58 you would keep the +58 offset. The offset you have now seems to put ALL the 1/2" wheel width difference all OUTWARD.

6mm inward and 6mm outward is 12mm total which is the 12mm or 1/2" difference in width between a 10.5" wheel and 11" wheel. So a +58 splits the additional wheel width inward and outward.

But again, make sure you have tires that are similar in actual widths. You can do all this work and still have "poke" of the tire because a particular tire brand runs wide even though both read a 295/35/18.

For reference sake:
25.4 = 1"
~12mm = 1/2"
~6mm = 1/4"

 

The general tires I had before according to Google. Are almost identical to the nitto nt05 I bought

 

Vernon, this is what I got on tiresize comparing a stock Z06 stat with one with the +51 you mentioned.

 

This is what I get for the fronts.

 

Vernon, That’s reasonable. Do you have stats on the new rears?
Just for comparison, I was looking at a wheel site I never heard of but I <think> someone mentioned in this thread. ERS? Anyway for my wheel size/lug pattern there’s only one 10.5” wheel and the offset is 22mm, so I plugged that into the following. I’m wondering if those Forgestars have a similar offset?

 

Well the local shop that ordered them. Has a call into their rep. So I am just waiting to hear what the plan is.

 

I feel your pain. I was really interested in those same Forgestar wheels (CF5) as well as the F14, but after checking on their available offsets, I knew it wasn't going to work based on the widths they had. Anybody who tells you they have Forgestars that don't poke is not being honest with you. You'll never get a proper fitment with them because you can't order the custom offsets you'll need. Their website "says" they offer custom offsets but good luck being able to get them in the bolt pattern you require. The website says their Semi-Concave is available in an 18x9.5 from +22 to +62 and in a Deep-Concave in 18x11 from +23 to +63. So if you ordered a 18x9.5 +54 and 18x11 +63, that would probably be perfect. But, like I said, any of their distributors will tell you they're only available in Corvette sizes in 18x9.5 +50 and 18x11 +55 which still results in tire poke. That's why decided against getting any Forgestar wheels.

Really wanted a set of TSW Interlagos in 18x9 +50 and 19x10.5 +65 which would have been perfect but unfortunately TSW discontinued the Interlagos. The Cray Spiders are another option that you might take a look at. They have the same specs as the Interlagos and TSW Nurburings and they're a light wheel as well.

Hope your local shop has your back and helps you get the right wheels for your Z! Keep us in the loop ... good luck!

 

Here is my biggest problem. They have been making these wheels for a long time. The car has been around for a long time. I been on this forum looking at pics of cars with forgestar wheels. There is a lot of them that do not poke or they have a very very tiny amount of poke. I could deal with tiny bit of poke. My offsets are nothing like most of what I see here on the forum. Most people's are Rear 53-55mm, front are around 50mm. Like they have never made the wheel. When I hear the guy at my shop tell his rep. I want flush fitment. I get offsets that I have not seen anyone have. Then on top of that they poke way out there. Like a Honda civic some kid upgraded at Autozone. Then on top of that, I know my local ordered 18x9.5 fronts.... I got 18x9. Fine whatever I can deal with it. Then they stick out like they are 18x11. Just the whole process has been bad. Ordered back in March waited all this time and now I'm sitting on wheels and tires that do not fit.

 

Sounds like your local contact sucks.

Call Sam Strano and order through him. He has has put Forgestars on PLENTY of cars and knows what works. Just be prepared to wait a while for the wheels. He won't order wheels asking for "flush fitment" lol.

 

Once again. Ordering wheels for a c5 corvette should not be hard. The car is 20 years old. Who knows maybe it is my local guy. Maybe my car is crap and the alignment is all wrong. The only thing I know for sure is my offsets are different from what I see on the forum. Once I was pointed to how to measure and figure them. They are different from what most are. If I had a wide body kit or was trying to do something rare. I could then see a problem trying to fit something correctly. However saying 2002 C5 z06 customer wants them to sit flush. Should be pretty simple......Maybe I'm wrong.

 

I’m pretty sure the Spiders won’t clear big brakes like the Interlagos and Nurburings do if you have or plan on having big brakes.

 

You said it, car is old, you're not doing something new...so seems like your local contact sucks at this.

Knowledge is power. Look up online calculators, determine your own offsets, verify to some that can confirm fitment, order wheels.

 

Well update after all this time. Tried different tires. Really made a difference......however I still had some poke. Fronts not really however the rears were still out there in the wind. Forgestar has agreed to make me some new wheels. According to my local guy at the shop, Forgestar wants to make it right. However they are wanting me to specify my offsets. I am thinking +48 on the fronts +56 on the rears. Using online tools that seems to be correct. Any input from you guys before I order

 

Again, how did you calculate those numbers? Did you actually measure the backspacing on both front & rear wheels? You said your front wheels were 9", and not 9.5". Have you actually measured them and do you know how to do so, correctly? With the tires mounted, measuring wheel widths is very difficult. Without knowing the actual wheel width and backspacing numbers, everything is just a guess and you cannot guess at this stuff.

 

Yes sir. When we switched tires we measured their width. They were stamped 18x9 also rears were 18x11. I took measurements from tape measure and put them in an online calculator. I laid a straight edge across the wheel and measured from back of the pad. That's where I got the +44 and +51

 

Good work. Those are some strange numbers, for sure. Forgestar's standard offset for a 9" or 9.5" width front seems to be +50 and most people I know are satisfied with that spec. However, their standard offset of +53 for an 11" rear wheel is a little bit too aggressive, IMO. At the very minimum, I would like to see at least a +54 and preferably +56 or even a little more,on an 11" rear.

 

Good luck getting this straightened out - awesome that Forgestar is willing to replace the wheels with ones that fit better.