Jim S. '95 Z28

What is the suggested backspacing for 15 x 8 draglites? What are the measurements for the bolt circle? Also, will a 28 x 11.5" tire fit on them? TIA!

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+33 cube/- $$$$ mod

"Real men drive opposite lock."

[This message has been edited by Jim S. '95 Z28 (edited July 16, 2002).]

TedH

I would suggest a 10" rim for the 11.5 width, as long as you are going to buy rims. I have 6.5" backspace on my Cragars but other people have 7.5" and their tires do not stick out. I had to flare my fenders a bit.

I am glad I got the 6.5" backspace, even with the fender work, because I went to a 12.5 tire and it still fit (barely).

I don't remember the bolt spacing... Perhaps someone else can chime in here.

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'94 Black Z28, 383, 700R4
1/8 ET: 7.49
1/4 ET: 11.86
1/4 MPH: 112
http://www.downtime.cz28.com.index.html

Injuneer

Bolt pattern is 5 x 4.75". If you are using stock studs, you need 12mm lugs. Stock length studs will not pass tech.

8" to 10" rim is acceptable for a 28x11.5. Nice thing about the 10" width is you can always go to a wider tire, as mentioned in the post above. MT says 8", Hoosier say 8-10".

For a 15x8 get 6.5" BS. For a 15x10 go 7.5". You might not see these sizes in the Summit or JEG's catalogs, so go to the Weld website and get the part # for the larger offset wheels. That puts the tires completely inside the profile of the fender.

[This message has been edited by Injuneer 94FormM6 (edited July 16, 2002).]

Jim S. '95 Z28

Thanks for the quick replies, fellas

What type of "massaging" is required for both 28 x 9 abd 28 x 11.5 tires? Thanks!

Pro Stock John

Whoa let's use Draglites and M/T's for a quick list of what works...

Draglite 15x8, 5.5 backspace
-Requires caliper grinding
-Will sit fine in the wheelwell

Draglite 15x10, 7.5 backspace
-Requires caliper grinding
-Requires some clearancing of front inner fenderwell

On 15x8's I would run:
26x10.5x15 ET Street
28x9x15 ET Drag
28x11.5x15 ET Street

I would run 28x12.5x15 ET Streets on 15x10's.

I ran 15x8/28x0x15 ET Drags which are basically the same at 28x11.5x15 ET Streets and they fit without needing any work to the fender or wheelwells.

Check out some of my pics:
www.ls1tech.com/moderators/psj

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1998 Formula | ARE 422ci iron block with Stage II heads | 40 lb Injectors | LS6 Intake | TTS headers | 3" ORP | Mufflex 4" Catback | MSD Wires | Whisper lid | SLP MAF | FLP level IV 4L60E | Yank TPE4400 | Moser 9"/4.10's | RT Torque Arm | HAL Shocks and Springs (front) | V6 Springs (rear), Alston 8 pt Rollcage | Airlift Airbag | Weld Prostars | ASCD Hood | 11.15@120.30mph 1.53 3625 raceweight LS1TECH.COM

Ken95Z28

I just got done ordering some 15x10's Draglites with the 7.5 backspacing.
I'm also going to run the Hoosiers 26x10.5x15 on them.
Hopefully everything will clear, if not I guess some messaging is in order.
I like the idea with the 15x10s you can always go wider on the tire.

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1995 Z28 A4 3.42 Best ET(12.205@109.50) LT4 Hot Cam, 1.6RR's, K&N FIPK, 85mm MAF, Mac Header & Y-pipe, Flowmaster Exhaust, CutOut, Yank ST3500, TransGo Shift Kit, LT1 ScanMaster, CSI WP, M/T ET Streets, 6-point Wolfecraft and Ed Wright Programming

Ken's 1995 Z28
F-Body Fastest List

"Never be afraid to try something new. Remember that amateurs built the ark. Professionals built the Titanic."

Jim S. '95 Z28

F**k it. I'll just go with 28x10x16 Hoosiers. Thanks anyhow!

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The Z28; The other car

"Real men drive opposite lock."

N20Dave

I have the 15x8 with 28x11.5x15's ET Streets right now and need more tire for next year. MT's literature says 10" for the 12.5's but I called and the tech guy told me that the 12.5's will work on an 8" rim but there will be about a 1/2 less tread on the ground due to the sidewalls being in further. He said it would still be safe though. I went thru about 7 years worth of back issues of CHP and Car Craft (I have a big collection) and found over 50 cars using 12.5's on 8" wide wheels. I'm gonna try it before I go to the expense of getting 10"ers.

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94 Formula M6
Last year 10.98 @ 126
355 stock heads, P600

In the works:
383 worked heads, D1, th400

Pro Stock John

I have been rolling around on some 15x8/275-60-15 MH Racemaster (full treads) and N20Dave they cup like crazy, here is a pic of that setup...

http://www.boxofwires.com/mfba/mfba0...02-46-jpg.html

Guys keep in mind that non-DOT slicks are measured differently, so a 26x10.0x15 Hoosier slick is a true 10" slick. A 26x10.5x15 ET Street is about 9"s wide.

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1998 Formula | ARE 422ci iron block with Stage II heads | 40 lb Injectors | LS6 Intake | TTS headers | 3" ORP | Mufflex 4" Catback | MSD Wires | Whisper lid | SLP MAF | FLP level IV 4L60E | Yank TPE4400 | Moser 9"/4.10's | RT Torque Arm | HAL Shocks and Springs (front) | V6 Springs (rear), Alston 8 pt Rollcage | Airlift Airbag | Weld Prostars | ASCD Hood | 11.15@120.30mph 1.53 3625 raceweight LS1TECH.COM