Good morning, afternoon, evening and night, (whenever you read this post)
I am giving up on finding wheels for this car that fit without adapters and don't look like the traditional 5 spoke everyone and their grandma torq thrust IIs.
I found a decent wheel adapter company that mills the size and bolt pattern you need specific to wheel and car, and isn't going to gorge on the price.
I'm not sure exactly how they are figuring out the measurements... maybe some one can help with that.
I found these:
KMC DIME 127 18" x 8.5" I was gonna use a 255/35/18 in the front and a 275/35/18" in the rear Falken FK452
In that size they only come in a 5 on 115 or 4.5 pattern in a +38 offset.
I know our cars use a 5 on 4.75 or 120.7 pattern with a -11 to 0 offset (CORRECT ME PLEASE IF I AM WRONG ON THE OFFSET RANGE)
I WAS TOLD if I have a wheel with a +38 offset and a billet adapter that is a 5-4.75 to 5-4.5 with a thickness of 1 and 1/4 inch that is would make the wheel a 0 offset but the backspace would become 6 and 1/4 (OUR CARS AGAIN CORRECT ME IF I AM WRONG THE ONLY BACKSPACE AVAILABLE IS 4.01 or 4 and 1/100th)
I was told that if I needed the backspace to be the closest to 4.01 or 4 and 1/100th I would need a 2 and 1/8 inch adapter but that would make the offset -16
I was also told that to get a -11 offset I would need a 1 and 15/16th inch adapter. but still have a backspace higher than the 4.01
The torq thrust IIs fit with no adapters 4.01 backspace with a -11 offset with 5 on 4.75, no adapter.
All of these measurements were based on a wheel having an offset of +38 to begin with. I would appreciate any input from you guys and possibly any other wheel options regardless of offset or backspace.
Whao, Louis, What can I say? That's more technical info than some of us are used to dealing with. It looks as though either you're on top of it or you're working with a dealer who knows his stuff. I'm not used to using those kinds of numbers but from what I can tell you're either right on or pretty darn close. The only way to be sure wheels and tires are going to fit is by actually mounting. I'm sure you'll have some good looking rotors and calipers behind those wheels so post a pic for us when you've decided. Wow. Custom spacers. Pretty slick.
Jimmy B. Just can't wait to get on the road again.
Dude, I am sooo confused. No one seems to help. The people that make the wheel adapters can;t answer specific questions... I am tremendously pissed off... Either I put factory wheels on the car, or go with some crappy torq thrust II wheels and look the same as everyone else. No other wheel companies make off the shelf products for our cars, some 3-piece custom wheel companies won;t do it even if I supply the measurements. There has to be some company out there that makes an attractive looking wheel that fits today's modern looks, and not a crager ss knock off, or some modern twist upon that traditional 5 spoke design. THe new corvettes on the same 5 on 4.75 bolt pattern even the 2010 model does, however the backspacing of 6" and offset of +58 doesn't help either.. Are we forgotten in the dark? Shunned to one type of wheel? WTF?
Vette(s): 70 LT1 coupe, 69 350 HP coupe, 69 390HP 427 coupe, 71 LS5 convert, 85 coupe, 93 coupe
If you drive a vintage car, you should talk to suppliers in the vintage car terminology. Wheels are measured in inches wide, with inches of backspacing. You might get better results. But in any case please clean up your language. I think many members who might have been tempted to help just ignored you because of your apparent attitude.
I don;t think my language was brash, I don;t really have a foul attitude. In today's world of wheels, no one uses Imperial Standards, its all metric for the fact that they are usually all made in China or Korea. But even USWHEEL (all made in USA) use metric standards for measurement. You have to just remember the convert is 1" = 25.4MM
I'm just trying to find out if my measurements are FULLY correct in terms of finding out backspace conversion and such, are these adapters safe, and what will they look like if there has to be a 2" to 4 " adapter? will it stick out too far? With a rim size of 8.5" 8.5" + 2" is 10.5" and 8.5" + 4" = 12.5" Thats kinda high, especially if you have stock trailing arms, or am I just over thinking this?
I'm just thinking out loud but, no one but the manufacturer can speak for the quality of the spacers but as far as fit is concerned, if the wheel is 8.5" wide with a 6.5" backspace, and you mount it on a 2.5" spacer, it should still go right in the wheel well, but the tolerances were already so close that it wouldn't be a surprise if something rubbed . that's why I mention having a shop that would work with you to insure a correct fit. Other wise it's just hit and miss. I guess that's why more of us don't do the same. You see a C3 occaisionally with custom wheels, but I'd bet it it wasn't easy fitting them on there. Good luck on this project Louis, We'd sure like to know how it turns out.
Jimmy B. Just can't wait to get on the road again.
Vette(s): 1981 Great White Shark. Red Interior, 350/190hp. PS, PB (SS), A/C CC, T-Tops, Going to remain as Stock as possible. Served three years in Active Duty Army, then Retired Air Force after 34 years! Badger State Vetts Car Club. 175,000 Original miles!!
Jim and Larry are correct!!! I live in Wisconsin, have lived in Texas. I enjoy football but I do not think that you mean that "WTF" stands for "Where's the Football".
Vette(s): 1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.
[QUOTE=VetteSpecialties] If you drive a vintage car, you should talk to suppliers in the vintage car terminology. Wheels are measured in inches wide, with inches of backspacing. You might get better results. But in any case please clean up your language. I think many members who might have been tempted to help just ignored you because of your apparent attitude.Larry
Well said Larry. Louis, abbreviatin cusswords has the same effect on folks as writin em out. Not much of anyone takes to that stuff here.
I have a great wheel guy out of NC that I got my wheels from. I try to find his # tonight and I'll PM it to you. He knows C3s very well. BTW, all you measurements might be spot on and everything height and width wise may check out, but check you caliper clearance. Aftermarket wheels are notorious for caliper clipping on C3s...
____________________________________ LukesVette Homepage Veteran of Operation Iraqi Freedom
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Even my TT II's that were made with the proper offset clipped my calipers. It looks like your are trying to push the envelope with the tire size. Our fiberglass bodies vary a fair bit so when you are trying to push the envelope on size, you may find rubbing going on. These wheel manufacturer know that and don't want to end up with a set of wheels they can't use. When using wheel spacers you have to be real careful. Moving the wheel out will increase the bending load through the spindle and axle. This can cause your bearing to fail prematurely and or snap the spindle/axle. So if you are going to go this route, do periodic inspections for cracks. How do I know that? Well I am an Engineering Manager and run new product development teams for a mobile equipment manufacturer. We pay very close attention to wheel offsets and loads. When there is too much things break. suncountry2010-02-12 13:28:34
Full Size C3VR Lifetime Member #110 We are all young at heart Glen
Vette(s): Previous: 1984 Silver / Charcoal Coupe, 1988 Maroon Coupe / 1989 Artic White / Mod. Red Int. Coupe, Present:1976 Stingray Black / Black, Auto, 350 slightly modified (355 hp) Luxor Wires Redline Tires. / 2001 Speedway White Vert, Torch Red Int, LS1, Auto.
I'm cornfused Louis..... am I wrong or dent you buy wheels and tires way back when? I wuz a-thinkin ya showed pics of em just ta tease us some. Which by the way.... ya seem ta be purty gud at..... Tuxblacray2010-02-13 23:50:55
Hi Louis: Check with Intro Wheels. I bought a set of 18 inch billet wheels from them in 2004. They were made for my car, 1968 Coupe. The front tires are 245/40ZR18 Nitto NT-555 and the rears are 275/40ZR18. The wheels are 18x9 upfront and 18x10 in the rear. They are their Pentia wheels, which are 5 spokes with nice deep dishes. Since they were manufactured for my car I do not have spacers. They are inherent in the wheels, they do not protrude and never had any rubbing of any kind. The owner know very well the old Vettes. You can find them at www.introwheels.com. If you see a dark blue 1968 in there, that is mine, which is currently being restored. Hope this helps. Joaquin
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