[crankaholic]

Originally Posted by Bitchin' Camaro

What are the specs on your spacers? I bought ones for a Cadillac ATS-V and they are spec'd as 66.9 CB

http://www.ebay.com/itm/231446942439

Are you returning your spacers for 66.5. Actually I think there is a slight tolerance. I've found 66.6mm hub centric adapters and 67.1mm. I think that would correlate with 66.5 and 66.9 CB.

So I've got 66.9mm CB spacers and 67.1mm hub centric rings and both may be not correct......

The studs stick out 40mm and the spindle sticks out 10mm.

I couldn't get the 66.56mm hub centric rings to fit... I'll try 66.9 next time. The spacers are listed as 66.50mm center bore, but the machining quality on those things is bonkers (they're made in Germany and TUV certified)... the Amazon $15 rings look a bit chintzy, and might not be machined accurately.

[crankaholic]

I also bought a set of 433MHz TMPS sensors on ebay... but reading other threads it seems I need to buy a tool that will tell the computer that it needs to look for new sensors. Currently I get two dashes -- instead of a tire pressure reading.

http://www.ebay.com/item4d3d78d647

[crankaholic]

More photos of how the wheels look on the car. Pardon the dirty car...

[Bitchin' Camaro]

Looks good. I actually picked up my car on Friday 1/29 so I was able to spend some time measuring and test fitting some wheels.

I also measured 40mm stud sticking out, so with my 15mm spacers, the wheels need a 25+1mm recess. The wheels I have have an 11mm recess.......working on that but doesn't look likely unless I press in shorter wheel studs.

On the bright side, the hub rings I bought with an ID of 67.1mm fit perfect (but like I said above, the wheels they go into don't fit!).

Also my wheel spacers fit perfect also. Too bad I don't have wheels that will work with them at the moment. http://www.ebay.com/itm/231446942439

The wheels I was trying to fit are 19X9.5 ET36. Unfortunately, I think they still won't fit even if the spacer worked out. There is a triangle welded on part of the strut that the wheel will hit. If they were 20X9.5 ET36 no problem but the 1/2" lower rim flange looks like it will hit this strut part.

The wheels and tires didn't cost me anything, just was hoping to use them (with all season performance tires) to get me through the winter. I'm probably going to end up buying some stock size Conti DWS 06 tires and swap them onto the stock wheels. At least it'll be warm this next week so I have time before the temps drop again. The hub centric rings were super cheap so who cares. The 25mm spacers I'll either hold onto in case I end up putting in shorter studs (would like to eventually run OE rear wheels all around), or resell to get my money back out of them.

[crankaholic]

Originally Posted by Bitchin' Camaro

On the bright side, the hub rings I bought with an ID of 67.1mm fit perfect (but like I said above, the wheels they go into don't fit!).

Can you post a link of where you got those..? The 67.1mm rings I bought have a noticeable amount of play :/

Originally Posted by Bitchin' Camaro

The wheels I was trying to fit are 19X9.5 ET36. Unfortunately, I think they still won't fit even if the spacer worked out. There is a triangle welded on part of the strut that the wheel will hit. If they were 20X9.5 ET36 no problem but the 1/2" lower rim flange looks like it will hit this strut part.

19x9.5ET36 should fit even with a 5mm spacer... http://www.ebay.com/331647682372. There will be enough spindle and lug nuts (edit: bolts...) sticking out - especially for a winter setup.
To try if everything fits, get some washer(s) that equal 5mm and install the wheel over them. If nothing rubs and there is enough thread, buy the spacers.

[crankaholic]

A rear 3/4 shot, after 130 miles of driving on dirty roads..

[Bitchin' Camaro]

Originally Posted by crankaholic

Can you post a link of where you got those..? The 67.1mm rings I bought have a noticeable amount of play :/




19x9.5ET36 should fit even with a 5mm spacer... http://www.ebay.com/331647682372. There will be enough spindle and lug nuts sticking out - especially for a winter setup.
To try if everything fits, get some washer(s) that equal 5mm and install the wheel over them. If nothing rubs and there is enough thread, buy the spacers.

I got the rings through TireRack. No link, just have to call. I said I needed 79.5 to 66.9 rings for a 2016 Camaro which is the same as the old Camaro. That's what I told them and got the 79.5/67.1 rings. I've used lots of hub centric rings in lots of wheels over the years and these are correct.

Good idea to try 5mm washers to fit up the wheels. It was kinda hard to determine if the wheels would hit the strut due to the spacer issue. I just dug up some old spacers, wish I'd thought of that earlier, oh well. I'm going to keep working at it because aside from the all season perf tires I wanted to install, I also have some track day rubber in the same size I'll want to use. So definitely want to get those wheels to work. But I just ordered some Conti DWS 06 tires in the OE size to use for the winter/cold months. I'll put them on Wednesday when they come. They'll work out better than what I had planned anyway, which are 275/35R19. Those would have been a little short. A nice wide look but short. And now that I actually have my car, I really like the look and stance as stock

[Imp]

Love this thread. Right up my alley! I'm looking at downsizing to 19s for autox, and this thread has the right technical information to make a determination instead of just "they fit".

Yeah, the washers is an old trick to test the needed clearances. You do not need much space between calipers and the wheel. They don't flex much. You do need to worry about outboard (fender) and inboard (shock/suspension) clearances more because of tire flex under load.

It would be great if you can get by with just a 5mm spacer... of course, "no spacer" would be ideal.

BC... do you also have the 6pots like Crank? I'd love to get some measurements of their size differences.

--kC

[crankaholic]

Originally Posted by Imp

Love this thread. Right up my alley! I'm looking at downsizing to 19s for autox, and this thread has the right technical information to make a determination instead of just "they fit".

Yeah, the washers is an old trick to test the needed clearances. You do not need much space between calipers and the wheel. They don't flex much. You do need to worry about outboard (fender) and inboard (shock/suspension) clearances more because of tire flex under load.

It would be great if you can get by with just a 5mm spacer... of course, "no spacer" would be ideal.

BC... do you also have the 6pots like Crank? I'd love to get some measurements of their size differences.

--kC

Yeah, I'm planning on running 19s for summer tires as well. Besides being disappointed that the optional ($2k!!!) wheels ended up being over 30lbs each, I like the way the smaller wheels look on the car and the money savings are a plus.

19x10" +24ET (164mm backspace) with 275/40R19 tires for a square stance is probably the way to go. I don't see myself adding any significant amount power to the car, that 275 section tires won't be able to handle, so the headache of finding and buying some expensive wider tires isn't worth it.

19x11" +34ET with 305/35R19 tires for the rears if I'm really feeling crazy but that limits my tire choice to Pilot Super Sports and the rears are $100 more per tire.

[Imp]

I'd be stuck with 19x8.5 and 19x9.5 because rules. That said, there is a better selection of summer only tires in 19s than 20s right now, and lighter, and ~1"+ shorter in diameter tires = better gearing.

--kC

[Bitchin' Camaro]

My brakes are the standard SS 4 pot Brembos.

From one of the other wheel supplier threads, they show 19X10 ET25 with a 3mm spacer (so ET22) as fitting on the front. So my 19X9.5 wheels ET36 w/ 15mm spacer -> ET21 should fit. Since I ordered the Conti's in OE size, I'm set for the winter months now. But I'll use some 275/35R19 Hankook RS3v2's all around for track days. A little short but should be a blast on track. I have a handful of slip on spacers that'll use to see what will let the 19X9.5 ET36 fit. The poke 85mm at ET36 (stock is 83mm) they have too much inset (I think) at 157mm. Stock is 133mm, ZL1 fronts have 150mm (and fit supposedly), OE 20X9.5 ET39 rears on the front have 160mm and do NOT fit. So somewhere between 150-160 is the magic number (for a 20" wheel anyway).

The Conti's should show up tomorrow. I'll weigh the stock wheels and tires and Conti's when I change them over. The 19's I have are very light, so light they'll probably flex and and give back all the camber! (years ago a Ford Cobra came with really cool looking wheels but flexed so much they were know as the 'slow' wheels). There's a good reason OE wheels are so heavy, you don't just throw in extra metal to save cost. Aside from flex there are all kinds of impact durability tests, etc.

[crankaholic]

Originally Posted by Bitchin' Camaro

My brakes are the standard SS 4 pot Brembos.

From one of the other wheel supplier threads, they show 19X10 ET25 with a 3mm spacer (so ET22) as fitting on the front. So my 19X9.5 wheels ET36 w/ 15mm spacer -> ET21 should fit. Since I ordered the Conti's in OE size, I'm set for the winter months now. But I'll use some 275/35R19 Hankook RS3v2's all around for track days. A little short but should be a blast on track. I have a handful of slip on spacers that'll use to see what will let the 19X9.5 ET36 fit. The poke 85mm at ET36 (stock is 83mm) they have too much inset (I think) at 157mm. Stock is 133mm, ZL1 fronts have 150mm (and fit supposedly), OE 20X9.5 ET39 rears on the front have 160mm and do NOT fit. So somewhere between 150-160 is the magic number (for a 20" wheel anyway).

The Conti's should show up tomorrow. I'll weigh the stock wheels and tires and Conti's when I change them over. The 19's I have are very light, so light they'll probably flex and and give back all the camber! (years ago a Ford Cobra came with really cool looking wheels but flexed so much they were know as the 'slow' wheels). There's a good reason OE wheels are so heavy, you don't just throw in extra metal to save cost. Aside from flex there are all kinds of impact durability tests, etc.

According to my calcs OE rears have 173mm of backspace. That definitely won't fit on the front - I would say 166mm is the max for a 19" wheel... and even then there might be rub with tire deflection.

[Bitchin' Camaro]

Originally Posted by crankaholic

According to my calcs OE rears have 173mm of backspace. That definitely won't fit on the front - I would say 166mm is the max for a 19" wheel... and even then there might be rub with tire deflection.

I get 160mm of backspace for the OE rear wheel, 9.5. What I've been using is poke + inset (backspace) = rim width. Lets see if we're using the same terms and if I did something wrong. I know, backspacing is measured in inches usually but I like mm better especially since offsets are given in mm.

9.5 inches X 25.4 = 241.3 mm rim width (inside lip of the wheel, doesn't account for the wheel lip thickness or how much the tire sidewall bulges out farther, but helps to compare wheel spec to spec and relative differences).

241.3 / 2 = 120.65 mm (so if ET0, the poke and backspacing are equal at 120.65 mm

So a wheel with ET39 would have a poke of 120.65 - 39 = 81.65mm and a backspacing of 120.65 + 39 = 159.65 mm.

[crankaholic]

Originally Posted by Bitchin' Camaro

I get 160mm of backspace for the OE rear wheel, 9.5. What I've been using is poke + inset (backspace) = rim width. Lets see if we're using the same terms and if I did something wrong. I know, backspacing is measured in inches usually but I like mm better especially since offsets are given in mm.

9.5 inches X 25.4 = 241.3 mm rim width (inside lip of the wheel, doesn't account for the wheel lip thickness or how much the tire sidewall bulges out farther, but helps to compare wheel spec to spec and relative differences).

241.3 / 2 = 120.65 mm (so if ET0, the poke and backspacing are equal at 120.65 mm

So a wheel with ET39 would have a poke of 120.65 - 39 = 81.65mm and a backspacing of 120.65 + 39 = 159.65 mm.

You're right! I was using the measurements I took off the wheel...