Rear Wheel Adapters.....NEED FINAL ANSWER !
Thread Starter
Safety Car
Joined: Dec 2010
Posts: 3,938
Likes: 498
From: Fords, NJ
Rear Wheel Adapters.....NEED FINAL ANSWER !
Yes I'm putting OEM C6 Polished 5 Spokes on my 04.
I LOVE them and that's that !
I have done the search, read MANY threads and I'm not coming up with a conclusive, final, definitive answer.
According to charts I have seen, things I have read, the stock C5 Wheel offset is +58 mm in the front, +65 mm in the rear.
Stock C6 wheels are +56 mm in the front, +79 mm in the rear.
So if my calculations are correct, the front wheels are basically a straight swap. Ok, they are off by 2 mm, no big deal.
The rear wheels have a difference of 14 mm. ( 79-65 =14 )
Yet I'm seeing and reading about adapter width's anywhere from 20 mm ( 3/4") to 25 mm ( 1") being used in the rear.
Am I missing something here ?
What width adapter will I need to bring the rear tires out flush with the rear fender ?
I LOVE them and that's that !
I have done the search, read MANY threads and I'm not coming up with a conclusive, final, definitive answer.
According to charts I have seen, things I have read, the stock C5 Wheel offset is +58 mm in the front, +65 mm in the rear.
Stock C6 wheels are +56 mm in the front, +79 mm in the rear.
So if my calculations are correct, the front wheels are basically a straight swap. Ok, they are off by 2 mm, no big deal.
The rear wheels have a difference of 14 mm. ( 79-65 =14 )
Yet I'm seeing and reading about adapter width's anywhere from 20 mm ( 3/4") to 25 mm ( 1") being used in the rear.
Am I missing something here ?
What width adapter will I need to bring the rear tires out flush with the rear fender ?
Racer
Joined: Aug 2012
Posts: 270
Likes: 113
From: SF Bay Area
The correct and safest way to do this is with wheel spacers and longer studs (if necessary). If read correctly, you need 14mm out (positive).
If you can not locate a specific size, a competent machine shop will be able to machine down a spacer to your specs.
If you can not locate a specific size, a competent machine shop will be able to machine down a spacer to your specs.
Thread Starter
Safety Car
Joined: Dec 2010
Posts: 3,938
Likes: 498
From: Fords, NJ
I figured its +14 mm. What I want to know is how does most come up with 20 to 25 mm width ?
As for Adapter vrs Spacers? A lot of guys here who put C6 wheels on their C5 use adapters. As long as it's a well made piece and the lugs are properly torqued there shouldn't be an issue. I have no plans on running road races or drag's. Cruising on the weekends and occasional shows is about the extent of my driving but thanks for the advice, noted and appreciated !
Last edited by SG Lou; Mar 5, 2017 at 10:50 AM.
Safety Car
Joined: Apr 2011
Posts: 4,260
Likes: 429
From: Houston TX
Most people go thicker than your calculations because of personal taste. To many, myself included, a more aggressive offset looks better than a weak offset. For this reason alone, they'd use a thicker spacer/adapter than what is required to simply bring it out to factory specs.
Advanced
Joined: Aug 2008
Posts: 84
Likes: 5
2 ways to do it.
Longer wheel studs and spacers - pain in the butt.
Adapter that bolts on ( thats why it is so thick it has to clear current wheel studs and it has its own wheel studs built into it). I would run the ~20mm adapter and be done. It will push the wheel out 6mm, a quarter of an inch.
Longer wheel studs and spacers - pain in the butt.
Adapter that bolts on ( thats why it is so thick it has to clear current wheel studs and it has its own wheel studs built into it). I would run the ~20mm adapter and be done. It will push the wheel out 6mm, a quarter of an inch.
Thanks.
I figured its +14 mm. What I want to know is how does most come up with 20 to 25 mm width ?
As for Adapter vrs Spacers? A lot of guys here who put C6 wheels on their C5 use adapters. As long as it's a well made piece and the lugs are properly torqued there shouldn't be an issue. I have no plans on running road races or drag's. Cruising on the weekends and occasional shows is about the extent of my driving but thanks for the advice, noted and appreciated !
I figured its +14 mm. What I want to know is how does most come up with 20 to 25 mm width ?
As for Adapter vrs Spacers? A lot of guys here who put C6 wheels on their C5 use adapters. As long as it's a well made piece and the lugs are properly torqued there shouldn't be an issue. I have no plans on running road races or drag's. Cruising on the weekends and occasional shows is about the extent of my driving but thanks for the advice, noted and appreciated !
Thread Starter
Safety Car
Joined: Dec 2010
Posts: 3,938
Likes: 498
From: Fords, NJ
2 ways to do it.
Longer wheel studs and spacers - pain in the butt.
Adapter that bolts on ( thats why it is so thick it has to clear current wheel studs and it has its own wheel studs built into it). I would run the ~20mm adapter and be done. It will push the wheel out 6mm, a quarter of an inch.
Longer wheel studs and spacers - pain in the butt.
Adapter that bolts on ( thats why it is so thick it has to clear current wheel studs and it has its own wheel studs built into it). I would run the ~20mm adapter and be done. It will push the wheel out 6mm, a quarter of an inch.
Last edited by SG Lou; Mar 4, 2017 at 02:35 PM.
Melting Slicks
Joined: Mar 2009
Posts: 2,300
Likes: 115
From: Odessa FL
St. Jude Donor '10-'12-'13-'14-'15-'16-'17
Last edited by alxltd1; Mar 4, 2017 at 05:12 PM.
Thread Starter
Safety Car
Joined: Dec 2010
Posts: 3,938
Likes: 498
From: Fords, NJ
Maybe this will help. If the C5 rear wheel came with a +65 offset and the C6 wheel has a +79 offset mounting pad is 14mm further in from the center line of the wheel and correspondingly the outer edge of the rim is further in from the fender line. So placing a 20mm adapter at the hub you push the wheel further out and mitigate the 14mm offset difference, but by 6mm more than needed, or converted, you will be approximately ¼ inch (6mm + .236”) further out than the where the stock wheel would be. You needed 14mm, approximately ½ inch, but you added 20mm, approximately ¾ inch, placing your wheel 6mm or approximately a ¼ inch further than you needed. You can go to this web site and play with different off-sets to see how they affect wheel position relative to the center line and fender. I would use a wheel adapter rather than a spacer. Because it has its own studs and is hub centric. But I think minimum width you can get them in is 20mm or 1 inch. Having said all that the safest way is to get wheels with the proper off-set, but you have been through all that already.
Last edited by SG Lou; Mar 4, 2017 at 05:07 PM.
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Thread Starter
Safety Car
Joined: Dec 2010
Posts: 3,938
Likes: 498
From: Fords, NJ
I run these and love them.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
bolt on deal, but you need to trim the unthreaded nose of factory studs.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
bolt on deal, but you need to trim the unthreaded nose of factory studs.
Last edited by SG Lou; Mar 4, 2017 at 07:16 PM.
Le Mans Master
Joined: Nov 2001
Posts: 8,080
Likes: 151
From: Toronto
Sourced my adapters for my truck here, ask for Lenny.
Great quality, made in the USA to order.
http://www.motorsport-tech.com
frank
Great quality, made in the USA to order.
http://www.motorsport-tech.com
frank
Racer
Joined: Jan 2012
Posts: 484
Likes: 47
From: Bridgewater NJ
I used 20 mm adapters and they fit perfectly. I saw pictures of others here who used 1 inch or 25 mm and felt they were too much. I actually have an extra set of 20 mm adapters for sale if you're interested, I'm located in Bridgewater NJ not too far from you.
Drifting
Joined: Apr 2015
Posts: 1,893
Likes: 295
From: Buffalo NY
I know you mentioned you already know how to trim the studs. I'll be putting together a DIY video in the next few days showing how to do it, for other members.
For reference here is my 2000 FRC on 2006 Base Wheels (19x10 rear, +79mm offset), using a 25mm bolt on spacer. I will be adding a spacer to the fronts as well to fill the gap. In my humble opinion the 25mm fills the rears perfectly. I prefer to have a "flush" look, maybe minus a few mm, to make sure there is no body contact under hard cornering.
For reference here is my 2000 FRC on 2006 Base Wheels (19x10 rear, +79mm offset), using a 25mm bolt on spacer. I will be adding a spacer to the fronts as well to fill the gap. In my humble opinion the 25mm fills the rears perfectly. I prefer to have a "flush" look, maybe minus a few mm, to make sure there is no body contact under hard cornering.
Last edited by nsogiba; Mar 6, 2017 at 08:28 AM.
Thread Starter
Safety Car
Joined: Dec 2010
Posts: 3,938
Likes: 498
From: Fords, NJ
I decided, for now, to go with 20 mm adapters. If I decide I'm not liking the stance I can always replace them with 25 mm.
New Schrader TPSM's are ordered along with a set of new Continental ExtremeContact DWS 06 .
285/35ZR19 for the rear and 245/40ZR18 for the front.
THANK AGAIN ONE AND ALL FOR ALL OF YOUR HELP.
New Schrader TPSM's are ordered along with a set of new Continental ExtremeContact DWS 06 .
285/35ZR19 for the rear and 245/40ZR18 for the front.
THANK AGAIN ONE AND ALL FOR ALL OF YOUR HELP.
Last edited by SG Lou; Mar 6, 2017 at 10:48 AM.
