It would be very helpful to hear of your experiences/failures and what manufacture has produced the best product. Good, bad or otherwise.

I picked up a set of 3/4" (billet) adapters from a CF member about a year ago. (Mfgr unknown err forgotten)
Although they have accumulated a few thousand miles, I remove and inspect them at the annual maintenance interval.
So far, no signs of flexing or cracking. And torque on both the adapter and wheel nuts have not changed.

Wheel spacers

Wheel adapters

Die cast cheapos that have a high rate of failure

 

I prefer the hub-centric adapters, but its a personal choice, just seems safer with material inside the hub of the wheel also, one of those 'just in case' things, and its what I have on the rear of mine

 

Billet is the only way to go.

 

did you change your studs in order to run the 3/4 inch adapters? Where did you get 3/4 inch ones?

 

Cavi, the adapters simply bolt on your original studs using their nuts with conical washers.

Oldalaskaman made a good point that being hub-centric/wheel centric. The pictured adapter has a flange that centers the adapter on the spindle and then to the backside of the wheel hub center. Keeps the adapter and wheel concentric.

 

For what it's worth, I know the 3/4" adapters get you back the early C4s back "stock" clearance but I'm running 1" adapters on the front of mine and it fills the wheel well so much better. Looks much cleaner!

 

Mine look good as well, (though 1"), I recently went to long ARP studs and knocked out the adapter studs in the adapters (ARP said this was better, we'll see.)

That is a shocking failure, looks like they were exposed to a ton of heat (blow torch and hammer...?). I'm not sure I follow on the "these numbers = made in china." Any clarification there?

That said, of course billet is the way to go.

 

How about some pics to show us ???

 

The additional 3/4" flushes the front and matches the rear.



Clearances are tight, so the 1" moved the tire into constant contact with the wheel well edge.

 

anyone know where I can get 3/4-1" for my rear on my 94? Sorry to hi-jack

 

all the venders on here, the forsale section, and fleabay

 

Mine are 16mm "pass-through" so maybe I don't belong here!

3/4 = 19.05 mm BUT ANYWAY!

Mine were done 9+ years ago to my specifications by a "professional" tradesman. Mine are hub and lug centric. My spacer is a better fit to my hub than an OE wheel and the hub aspect of the spacer is a better fit to my wheel than an OE wheel to an original hub. Mine are used to accommodate a 50 mm offset GS 11" wheel on the rear of my ZR-1. I did them + 2 mm and wish I had done 18 mm. I use an extended length wheel stud from GM.

The first "spacer" example pictured is something that is used generally to accomplish caliper clearances and in dimensions 6 mm or less. "Generally"!!!

The second example "adapter" is often thought as the preferred BUT if the center bore isn't a match to the hub and the adapter isn't a match to the center-bore of the wheel your using - you've accomplished what?

A spacer/adapter should be tailored to each wheel/tire/car combination! There isn't a "FIT-ALL"!

I found these people some time ago and if you go to their website you can educate yourself to a certain degree. Use the links on the left and build yourself some spacers and adapters. While you're there pay attention to center-bore and "learn"!

Pay attention to the details - you'll see that an adapter starts at 19 mm (3/4") and can be done in 1 mm increments so that you can accomplish a "tailored fit". If you're going to spend the money you might as well "get fit"!!

here's a spacer link: http://www.motorsport-tech.com/4DCGI/wheel_spacers


here's an adapter link: http://www.motorsport-tech.com/4DCGI/wheel_adapters

I paid substantially more for mine and if I were to need others I'd go right back where mine were done but these people seem to have a program!

 

The "these numbers = china" isn't a comment by the OP - it's part of the image he imported from a vendor. There's no clarification he could pass on!

 

I know that and I read the site before I posted, no additional info there, thus why I asked for "any" clarification. I guess I figured maybe one of you wise guys would know.

Interesting though that the place you linked puts a cap on spacers at 30mm. So the idea of a 1" spacer with, I assume, high strength (ARP) lugs is not a problem for them.

 

The pics are from wheeladapter.com.

My take on the busted die cast pic is, it failed catastrophically from fatigue. Most likely someone used the wrong nuts (or no washers) to secure the adapter which cracked the adapter at each fixation point. Note the very thin web area in those areas. The "burnt" area is not from heat. It is blackened aluminum dust where the spacer rubbed against the iron brake rotor/drum and rust after the adapter started to move.

 

If anyone needs spacers and or adapters look at this company....billet, including hub centric and wheel centric any size/width etc.. I needed some 3/16" spacers for my 15" fronts, this company makes a great product.

 

Mick, somethings missing, or am I missing something ?

 

Maybe.........
http://billetwheeladapters.com/?gcli...FULc4AodNggdqQ

 

Thanks. Yeah, I suppose so, I've haven't seen pics like that before, pretty impressive failure.

 

Dan, ooopps yeah I totally forgot this:
http://www.motorsport-tech.com/