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Old 10-23-2009, 01:24pm   #1
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Default Backspacing - C5 vs C6?

Aloha all, can anyone tell me if the stock backspacing for the C5 & C6 are different?

Thanks!
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Old 10-23-2009, 01:38pm   #2
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Yes, there is a slight difference in wheel offsets. Some have run C6 stock wheels with no problems. Others have reported needing spacers.
Stock size C6b wheels and tires will fit just fine. Larger tires will need a spacer.
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Old 10-23-2009, 02:07pm   #3
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Thanks brutha Sneaks.
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Old 10-23-2009, 02:16pm   #4
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I also have some background on C5 wheels............let me know if ya have any questions:

My consolidated list of personal stock
Wheel size,type, & weight in lbs ea
OEM MAG 17 x 8.5, 17.5
OEM MAG 18 x 9.5, 19.5
OEM MAG 18 x 9.5 w/ new Yoko 295/35-18 AVS sport non-runflats, 50
OEM MAG 18 x 8.5 w/ new Yoko 275/35-18 AVS sport non-runflats, 46

PWO 5 spoke Y2K repos 17 x 8.5 +58mm, 20
PWO 5 spoke Y2K repos 18 x 9.5 +65mm, 23
HRE 18 x 9.5 545 w/ clear center +58mm, 22
HRE 18 x 12 545 w/ clear center +74mm, 27

PWO 17 x 8.5 +58mm w/ oem runflat 245/45/17 (8/32 tread), 50
PWO 17 X 8.5 +58mm w/ new MT ET Street 26 x 11.50 x 17 with TPS & lots of weights, 45
OEM MAG 17 x 8.5 w/ NITTO 555 275/40/17 (1/2 tread), 45
OEM MAG 18 x 9.5 w/ stock OEM 275/40/18 runflats, 53
OEM MAG 17 x 8.5 w/ stock OEM 245/45/17 runflats, 47
OEM MAG 17 x 8.5 w/ new MT ET Street Radial 275/40/17, 47
OEM MAG 18 x 9.5 w/ new Hoosier R3S05 275/35/18 road race radial 4.5 32nds tread with std valve stems 42

CCW drag pack rear 16 x 10 classic full polished with well worn MT ET Street 26 x 11.50 x 16 (1/32 tread) with center cap, 34

CCW drag pack rear 16 x 10 classic full polished with 1/2 worn MT ET Street 26 x 11.50 x 16 (3/32 tread) with center caps, 38


CCW drag pack front 16 x 5 classic full polished with like new Firestone deluxe champion 5.00/5.25-16 (10/32 tread) with center cap, 33

OEM runflat 275/40/18 worn to wear bars, 29
Bridegstone expedia S-01 345/35/18 (9/32 tread), 37
New MT ET Street Radial 275/40/17 (6/32 tread), 30
New MT ET Street Radial #3784R P315/30R18 26X12.50R18 (6/32 tread), 28
New MT ET Street 26 x 11.50 x 17 tires (6/32 tread), 25
MT ET Street 26 x 11.50 x 16 tires worn out (1/32 tread) 15.75
MT ET Street 26 x 11.50 x 16 tires (3/32 tread) 18
OEM runflat 245/45/17 (8/32 tread), 29
BFG G-force drag radial 345/30/18 new, 30
BFG G-force drag radial 345/30/18 1/32nd, 29.5
BFG KDW2 295/35/19 new, 32
Yoko 295/35-19 AVS sport non-runflats (2/32 tread), 29
Toyo Proxes RA1 335/30ZR18, new, (8/32 tread in the middle & 6/32 outside edges), 33.2

Topline 5 spoke Y2K chrome repos 18 x 10.5 +58mm offset rims w/ new MT ET Street Radial #3784R P315/30R18 26X12.50R18 , 58

Topline 5 spoke Y2K chrome repos 18 x 10.5 +58mm offset rims w/ new 275/35/18 BFG G-force TA drag radial, 53

Bob' House of Wheels 18 x 10.5 Chrome Y2K repos widened to 18 x 12. Work was done by Weldcraft Wheels.+56mm (with the 1.5" strip inserted, they should be right at 9.375" backspace, 31

HRE 18 x 12 545 w/ 345/30/18 BFG DRS, 57
HRE 18 x 9.5 545 w/ clear center +58mm w/ new 275/35/18 BFG KDWs, 52
HRE 18 X 9.5" 545 full polished w/ Yoko 265/35-18 AVS sport non-runflats (8/32 tread), 50
HRE 18 x 12 545 w/ 345/35/18 EXPEDIA S-O1 (9/32 tread), 64
HRE 19 X 10" 545 w/ Yoko 295/35-19 AVS sport non-runflats (5/32 tread), 58
HRE 19 X 10" 545 w/ new BFG KDW2 295/35-19 (10/32 tread), 61
HRE 18 x 12 545 w/new Toyo Proxes RA1 335/30ZR18 & TPS, 58.4 lbs
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Old 10-23-2009, 02:35pm   #5
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Quote:
Originally Posted by [email protected] View Post
Aloha all, can anyone tell me if the stock backspacing for the C5 & C6 are different?

Thanks!
Backspace dimensions are as follows:

C5 (coupe/vert):
Front 17x8.5", 58mm offset = 7.03" backspace
Rear 18x9.5" 65mm offset = 7.81" backspace

C5 Z06:
Front 17x9.5", 54mm offset = 7.38" backspace
Rear 18x10,5", 58mm offset = 8.03" backspace

C6 (coupe/vert):
Front 18x8.5", 56mm offset = 7.45" backspace
Rear 19x10", 79mm offset = 8.61" backspace

C6 Z06:
Front 18.9.5", 50mm offset = 7.22" backspace
Rear 19x12", 59mm offset = 8.82" backspace


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Old 10-23-2009, 03:17pm   #6
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Stock C6 wheels are way sunken in on a C5. They fit fine, but look like dookie.
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Old 10-23-2009, 03:26pm   #7
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Quote:
Originally Posted by Cobra4B View Post
Stock C6 wheels are way sunken in on a C5. They fit fine, but look like dookie.
The rears are, yes.

10" wide wheel with a 79mm offset.
I have 10" wide rear wheels on my car, had them made in a 52mm offset so they fit flush with the fender.

That offset difference pushes the C6 wheel inward a little over one inch. That's a lot!


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Old 10-24-2009, 01:33am   #8
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Good posts guys. ADV wanted to sell me one of their Concave 5 sets but it was on a C6 Z06 so I told them I'd get back with them.....Gonna have to pass on this one.
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Old 10-24-2009, 07:42am   #9
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Well.............tub yours and any of those 18 x 12 I have listed will bring a 345 near flush with the 1/4
Here is my Webpage on tires & wheels.......
http://temp.corvetteforum.net/c5/30s/index15.shtml
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Old 10-24-2009, 09:31am   #10
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good info here seems like you see someone ask this very question atleast once a week!!
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