I'm looking at this combo with Coys C5 Chrome wheels:

Front
Coys C5 17x8 with 4.0 BS with Nitto NT555 255-50-R17 tires

Rear
Coys C5 18x9.5 with 5.0 BS with Nitto NT555 285-40-R18 tires

This all comes out to ~ $1900, not including shipping, mounting and balancing.

To the guys using the Coys, how are they holding up, and any issues with them like runout or chrome peeling?

Motorhead, you got any pics of the inside clearance of your rear tires-wheel combo? Your car is my inspiration for this set-up

B.

 

Here's the only pic I can find inside 5 in bs 18x 9.5 with 285 / 40 /18 tires. I like them obviously. I have 255/45/17's on the front

 

i have them on my 67 camaro and i love them, i have the coys c-55 18"

the only thing that is a little bit of a pain is the hidden valve stem. because i have big disc brakes if i want to put air in the tire i have to take them off the car. but i also have a set of the c-5s for a 65 mustang im doing for a friend and the valve stems arnt behind the spoke like the c-55s. the quality is good and they are really good about returns if you get a blimished one. i have one with a earser sized blister and they returned it no problems. they are also very knowledgable on fitment and such. i would not hesitate to get another set in the future.

 

Make sure they have what you want in stock or it could be a long wait. Chrome on mine is perfect.

Yes their customer service is good once you get them. They replaced 2 of mine, wrong bolt pattern for one rear ( it is now a coffee table ) and one front had small runout ( it is now a clock )

 

I have a set of 17X8 chome C5's with Riken Raptor ZR 255/50 rears & 245/45 fronts on my 73.

That set up was $1600 including shipping.

They have been on the car about a year now and so far, no problems.

One tip would be to order extra valve stems.
They only sent me one with my order and I'm afraid of loosing it.

Someday I'll order a few extras.

 

Did you have to clearance anything on the trailing arm?

I had the TAs rebuilt last winter, but still have the E-brake cable in the stock location.

 

I ground mine down many years ago to clear the BFG 295's on 15 in. rim,

I am not positive but I think the 18 in rim clears the bracket or in other words the bracket fits inside the rim. Take a rear wheel off and measure the distance to the end of the bracket from the center of the axle and see

 

Motorhead, with those 285's do they stick out side past the fenders? Or are they all tucked in like the stock tires? That is my biggest concern of going with a wider back tire. Plus the back spacing and rim width has got me all confused. Also I noticed you got your back in raised up pretty high, you have several inches left on your spring bolts to lower the rear, or do you have your suspension set up a certain way?

 

The rear bolts ( hence the whole rear ) are lower now, that was when I first put them on hadn't adjusted ride height yet. The don't stick out they are pretty much flush with the fender.

I cannot guarantee that if the tire went up it would go inside the wheel well but I think it will since it will tilt in a bit.

You can also get 5 1/2 in. bs which brings the wheel / tire in closer, someone has those on their Vette but haven't seen him around recently. You would definatley have to relocate the parking brake bracket with 5 1/2 in BS.

These pics were taken when I first put them on too, the rear is lower now and I haven't had a problem but I am not going to say anyone else won't have a problem

This was as straight down as I could get obviously if you move the camera off vertical one way or the other it will make it look like the tire sticks out or is in more than it really is


BTW I redid my garage, it doesn't look like a garbage dump anymore

 

Why not 18" wheels in front too? That will give you more tire options to choose from. That's why I went with 18's front and back. Check an online site like TireRack.com - the selection of UHP 17" tires is limited, especially 255 width.

Brent, you live in Anoka County, right? So do I. Whatever wheel/tire combo you choose, consider how the tires will fit in the wheel wells. I've was pulled over twice by A.C. sheriff's deputies because they thought my tires were wider than my fenders. (Actually, I think they liked my '80 and wanted a closer look. ) That was when I had stock slot wheels with original-but-optional size tires - 255/60-15. I just told them my camber was off and that I was planning to get them aligned.

The 18's I have on now have 1/2" less backspace than stock, so I don't think I will be pulled over for that reason again.



FYI, my final wheel choice was between Coys and BOSS 338's (almost the same). I got a deal on BOSS wheel and tire combo I couldn't pass up, so I chose the BOSS. I am glad I chose gray instead of chrome because chrome would have distracted from the Code 28 Dark Blue Metallic (original color). I chose the muscle/funcitonal look over shine, but I like the shape of the Coy spokes better than BOSS.

 

Pulled over twice. Your joking!!!!

My 15x8 TTII's have only 3.75BS, so the 255-60-R15s on that set-up are out 1/4 inch further than the OEMS would be. Love the look.

Never had any problems with the law ever, as long as I'm under the speed limit !!

I'll look at 18s up front as well. Just dont want the DONK look.

 

What are you tire and wheel dimensions with the boss's? wheel width, tire size, etc. Also any sticking out past the fenders that you can tell? Looks like motorheads are right on the money.

 

The BOSS 338 wheels are 18x8 4.5" BS, front and back. All four tires are 255/45-18. The 4.5" BS compared to the 4.0" BS of the 15x8 with 255/60-15 tires put the outside of the tire 1/2" inside the edge of the wheel well edge just like you'd think.

FYI, the BOSS 338's come in chrome, polished, and black too. BOSS wheels are plentiful on eBay. Some sellers offer sets of two 8" and two 9.5" wide wheels if you want that look.

I agree though. Motorheads look great.

 

Put 17x8 graphite C5s on about a year ago. No problems with quality or finish. Really like them. As for the valve stems, Coys forgot to ship them so they overnighted two. The only minor irritant is that the flat caps that go on the flush mount valves tend to work loose. I've lost two so far that need to be replaced.

 

Well now I am confused, if you have width tire on just a bigger rim but lower profile, why would you need to change the backspace from 4 to 4.5. So the tire is tucked in more to the wheel well than the stock tires/wheels?

 

The original (but optional) tires on my '80 were 255/60-15 on 15x8x4. The brand of tire I had on the stock alloy slot wheels were a little wide in the shoulder and stuck out a bit. I didn't need to switch to a 4.5" backspace and didn't really want to. It's just that I couldn't pass up the deal I got on a set of 4 BOSS 338's with UHP tires. BOSS 338's just happen to come in 18x8x4.5 instead of 18x8x4. Yes, the tires are tucked .5" into the wheel well than my previous tires, but that's OK. They look like the base tire in terms of how they tuck into the wheel well. Tire profile has little to do with except for difference in shoulder width from one brand to another - 255 width tread is 255 width tread.

 

MNBrent, did you get your wheels yet?
So if you go to a 275 or 285 rear tire as I have seen some people do. You gotta relo the E brake mount, but what width wheel do you need? Can you still use an 8 inch stock rim or does it have to be wider? Then of course the backspace question then pops up? I Do not want it sticking out the sides past the wheel well/fender. I want the same position as the stock 255/60/15.

 

Haven't done anything about wheels yet. I'll wait until I get the LS1 running before I get real serious about this. I'm 99% sure the set-up in the first post is how I'm going to go.

Talk more to Motorhead about fitment of this size wheel/tire combo, since he's been running it for a few seasons now IIRC. The only 2 items to be checked out with the 18x9.5 wheel, with 5.0 backspacing, is the ebrake cable and bracket, and the spring end.

Look at how far down Motorheads 8inch bolt goes as compared to his rim ID. That should give you a clue to spring placement in your vehicle.

He also stated he cleared the e-brake bracket just with rim ID only, but may have had help with a grinder.

The rim/tire coming outside the body fender lip looks like a non issue as you can see from the photo top down of the rear fender. For me I prefer the tire further out look, and have been running this way with 1/4 inch further out for 8 years now with my 15x8 TTIIs.

For the 18x9.5 rear, it will be great with 1/2 inch coming out further, but the front wheel sizes seem to be only offered in 4 inch BS. Thats part of my problem is I dont like the only 4 inch BS tire. I would prefer an 8inch wheel with 3.75BS.

The whole point of getting this is for the wider rubber that is light years ahead of S or T rated 15inch 255-60 tires. I would recommend the 285-40-R18 over any 275 tire, since it gets you the theoretical wider contact patch, but still retains the 27 inch height profile to fill the fender and keep your speedo accurate. I would love to find a 295 tire that keeps the 27 inch OD.

You can be the first to go. Show us your set-up once you get there

 

Brent, thanks for the info I am saving this post for future reference. My bad, I did forgot scroll back up and read that motorhead had the same size tire I asked about. I guess if you go to a 275 or wider tire, you need the 9.5 inch wide wheel...
Now why would you want part of your tire sticking out past the wheel well/fender? The stance would seem strange to me as well as having road rocks/debris thrown all over the back side of the body. I can remember my Old Z28 had offset rims, and the tires did hang out past the fenders. Heck you could see it in the mirror. When it would rain, the last bit of tread, would throw a rooster tail of water 10 feet high going down the road..

Motorhead are those 8 inch spring bolts as Brent mentioned? I have 8 inch also and they are not long enough. My plan is to get the 10 inch so I can bring the rear down another 1.5 inches. Just do not want the washer/bushings to be bumped up against the tire or cut into if I take a turn. Maybe you can post a pic now if you have it adjusted. I hope... and I say Hope again, that I can have the engine and wheels done before Summer time. That is my short term goal as of now. I like the 18 inch rims, now. I was set on 17's.

 

It not that the tires will be sticking out of the wheel well. The OEM stance has the tires far INSIDE the wheel well. You can see with Motorheads rear tires, that even an extra 1/2 inch wheel extension outwards, it still does not stick out past the wheel fender lip.

My set-up now with 15x8 with 3.75 backspacing has the tires tread even with the fender lip with only the sidewall buldge coming out past the fender. No rooster tails and a proper fill of the wheel well, IMHO.

Wider is better for handling.