Wheel Hub Adapter
Thread Starter
Max G’s
Joined: Nov 2008
Posts: 2,751
Likes: 78
From: Monroe OH
NCM Sinkhole Donor
Wheel Hub Adapter
I recently purchased some 18x12 wheels so I could change my rear ratio through the rear tire change. The wheels were too close a fit on the inside (around the dog bones) for my comfort. So I purchased hub adapters from Motorsport-tech.com. They are aluminum and light weight. Fit and finish very nice. So, if you ever have an issue with some wheel fitment, this might help. 
Burning Brakes
Joined: Jun 2005
Posts: 1,188
Likes: 13
From: Wallingford Vermont
Thread Starter
Max G’s
Joined: Nov 2008
Posts: 2,751
Likes: 78
From: Monroe OH
NCM Sinkhole Donor
Melting Slicks
Joined: May 2000
Posts: 2,029
Likes: 63
My new wheels touch the C5 front calipers, only couple of mm less offset and I would be ok.
So, that would be spacer territory and I don't want to or even cannot legally use them - only adapters.
Team Owner
Joined: Sep 2003
Posts: 25,384
Likes: 2,736
Thanks for the info. Is the 3/4" adapter thick enough so the car wheel bolts (lugs?) are completely inside the adapter (do not portrude out at all)? I am looking for absolutely thinnest adapter I can use without having to change the original wheel lugs to shorter.
My new wheels touch the C5 front calipers, only couple of mm less offset and I would be ok. So, that would be spacer territory and I don't want to or even cannot legally use them - only adapters.
My new wheels touch the C5 front calipers, only couple of mm less offset and I would be ok.
So, that would be spacer territory and I don't want to or even cannot legally use them - only adapters.Do your after-markets have this recess? You can create the recess with very little effort if not.
How many mm are you needing? I wouldn't have a problem using a thin pass-through and maybe might prefer it if it was thin I needed.
Melting Slicks
Joined: May 2000
Posts: 2,029
Likes: 63
19mm (3/4) is to thin I believe to allow no stud protrusion BUT nearly all wheels (GM nearly all) have a recess between the wheel stud bores that allow the protrusion to NOT be an issue. On only one occasion did I need to trim the "dog point" (no threads) to allow the use of any.
Do your after-markets have this recess? You can create the recess with very little effort if not.
How many mm are you needing? I wouldn't have a problem using a thin pass-through and maybe might prefer it if it was thin I needed.
Do your after-markets have this recess? You can create the recess with very little effort if not.
How many mm are you needing? I wouldn't have a problem using a thin pass-through and maybe might prefer it if it was thin I needed.
Studs? Right, my english failed there
I'll have to take a look next time I'm at the garage. I tried the wheels quickly a month ago and was disappointed to see the fronts touched the calipers. From what I remember very little was needed. But, I'll have take a better look next time. I'll check if the wheels have any recess on the back side too.
What do you mean by pass-through? A Spacer? They are illegal here on street. Hypothetically: how thick spacer would you think is still safe to use? 5mm? Would I need longer studs?
Last edited by ToniH; Jan 5, 2016 at 12:22 PM.
Team Owner
Joined: Sep 2003
Posts: 25,384
Likes: 2,736
Thanks for the reply.
Studs? Right, my english failed there
I'll have to take a look next time I'm at the garage. I tried the wheels quickly a month ago and was disappointed to see the fronts touched the calipers. From what I remember very little was needed. But, I'll have take a better look next time. I'll check if the wheels have any recess on the back side too.
What do you mean by pass-through? A Spacer? They are illegal here on street. Hypothetically: how thick spacer would you think is still safe to use? 5mm? Would I need longer studs?
Studs? Right, my english failed there
I'll have to take a look next time I'm at the garage. I tried the wheels quickly a month ago and was disappointed to see the fronts touched the calipers. From what I remember very little was needed. But, I'll have take a better look next time. I'll check if the wheels have any recess on the back side too.
What do you mean by pass-through? A Spacer? They are illegal here on street. Hypothetically: how thick spacer would you think is still safe to use? 5mm? Would I need longer studs?
If your concern is the safety inspection I doubt it would be visible OR if your wheel has no recesses you mount with counter sunk hardware the spacer to the wheel and it's no longer a spacer. Maybe?
Thread Starter
Max G’s
Joined: Nov 2008
Posts: 2,751
Likes: 78
From: Monroe OH
NCM Sinkhole Donor
Thanks for the info. Is the 3/4" adapter thick enough so the car wheel bolts (lugs?) are completely inside the adapter (do not portrude out at all)? I am looking for absolutely thinnest adapter I can use without having to change the original wheel lugs to shorter.
My new wheels touch the C5 front calipers, only couple of mm less offset and I would be ok. So, that would be spacer territory and I don't want to or even cannot legally use them - only adapters.
My new wheels touch the C5 front calipers, only couple of mm less offset and I would be ok.
So, that would be spacer territory and I don't want to or even cannot legally use them - only adapters.
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Melting Slicks
Joined: May 2000
Posts: 2,029
Likes: 63
With the 3/4" adapter I have, the studs do not protrude past the holes of the adapter. If the CCW's only had 5 holes in them or if I placed the a molds on the adapters the wheel would fit flush on the adapter. Now note that I do have stock stud length, so if you had installed longer studs at some time the results would be different.
My studs are original.UPDATE: wont be going to my car to check the wheels & fitment for few days. Its -15°F outside and they forecasted -24°C for tomorrow. No way, I'll sit inside sipping hot rum!
So, the actual update when it gets a bit more reasonable outside.
Last edited by ToniH; Jan 7, 2016 at 08:27 AM.