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02-09-2006, 10:02 AM #1
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Metallic Navy Blue- 1998 Trans Am
ok...but whats this "offset", and what about width?
I've browsed through other threads explaining how to maintain the overall diameter of a tire when going with a different rim size. When going from factory 16" rims to 17" rims, you need one of these 3 sizes
245/45-17 = 25.7"
275/40-17 = 25.7"
315/35-17 = 25.7"
That I'm understanding, but what about rim width? I'm going to be buying a set of the Z06 17x9.5's (all four are 17"), so how do you know which size tire to buy to accommodate to new rim width?
Also, I read about offset..what exactly is that? How do you choose the right offset for new rims - such as the Z06 17x9.5?
Thanks
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02-09-2006, 01:24 PM #2
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Metallic Navy Blue- 1998 Trans Am
ehh, anyone have a clue here?
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02-09-2006, 05:52 PM #3Originally Posted by sketterman
http://www.yokohamatire.com/utcustom.aspLast edited by Fastcar; 02-09-2006 at 06:12 PM. Reason: added link
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02-10-2006, 09:37 PM #4
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Metallic Navy Blue- 1998 Trans Am
well the rims Im going to buy like I said are Z06 rims, and they claim they will fit any 93-newer camaro or TA, and of course vettes. So I guess the offset isnt my concern here, I just wanted to know what it was so thanks for that but with width, I wasnt sure what size tires to buy since they are 9.5 width. I've heard that 245/45/17 will keep the same overall diameter, but will it fit a rim that is 9.5 width? Or do I need the 275/40/17 to still maintain the same overall diameter, AND be wide enough to fit the rim?
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02-10-2006, 10:17 PM #5Originally Posted by sketterman
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02-11-2006, 07:50 AM #6
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Metallic Navy Blue- 1998 Trans Am
I see, well I also plan on slapping on some Sportlines too, which is why this thread was started, I was a bit concerned about that. I think the offset of the rims was 56mm, or something very close to that. Is that the right area for this kind of app?
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02-12-2006, 05:00 PM #7
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Black- 1998 Trans Am WS6
Here ya go... pulled this from LS1Tech.com so credit to them.
TIRE CALCULATOR !
http://www.discounttiredirect.com/d...nfoTireMath.jsp
http://www.discountpartcenter.com/tirecalc.html
Camaro & Firebird Fitments
--------------------------------------------------------------------------
Bolt Pattern
5 x 4.75" or 5 x 120.65 mm
The numbers in the columns are as follows:
WIDTH ..... OFFSET ......... WIDTH OF TIRE
Front and Rear
7.0" ..... +35 to +40 mm .... 215, 225, 235
7.5" ..... +35 to +45 mm .... 215, 225, 235
8.0" ..... +38 to +55 mm .... 225, 235, 245
8.5" ..... +38 to +45 mm .... 235, 245, 255
9.0" ..... +38 to +56 mm .... 255, 265, 275
9.5" ..... +38 to +56 mm .... 255, 265, 275
10.0" ... +38 to +48 mm .... 265, 275
REAR Only
10.0" ... +38 to +54 mm .... 275, 285
10.5" ... +38 to +50 mm .... 285, 295
11.0" ... +45 to +56 mm .... 315
Z06 Corvette Replicas:
17"x9.5" +50 to +56 mm no problems. 275/40R17.
18"x9.5" +50 to +56 mm 275/35R18 or 285/35R18.
18"x10.5" +50 to +53 mm. Higher than 53 mm will require the BFH mod. 285/35R18s thru 315/30R18. Over 295 may require rolling the fenderlip and will need the BFH.
Y2k Corvette Replicas:
17"x8.5" +56 mm
17"x9.5" +50 to +56 mm
18"x9.5" +50 to +56 mm
17"x11" Wheels
ZR-1 Style for Camaro +50 mm (Known as Grand Sport offset)
ZR-1 Style fo Firebird +36 or +50 mm The wheel well on the "bird" is a little wider.
American Racing TT-2's +45 mm
With 17"x11"s there is always a possibility of needing the BFH and/or fender rolling mods with 315s. If lowered, an Adjustable Panhard Bar becomes a virtual necessity. Some have used the +38 offsets with an 11" wheel but it does stick outside the fender and is definitly not recommended on lowered vehicles. +50 and +56 are the two most common. +50 is the better fit (for the ZR-1 replica).
For road race only applications a 17"x11" at all four corners can be made to fit.
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02-12-2006, 05:02 PM #8
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Black- 1998 Trans Am WS6
by the way BFH is Big Freakin Hammer mod... It means u gotta hammer the hub inside of the wheel well to make the wheel fit without rubbing
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02-12-2006, 09:58 PM #9
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Metallic Navy Blue- 1998 Trans Am
Hey man thats some awesome fxckin' research..I really appreciate that you have no idea damn..that solves half my problem, now I just gotta find out if lowering the car on sportlines will affect it at all, it seems only issue comes with 11" rims, so with mine only 9.5 I should be good to go. Again, thank you big time bro
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02-13-2006, 07:20 AM #10
I have 17x9.5 ZR1 with 56 mm offset on a 2002 Z28 with 285/40/17 BFG. They fit just fine with no issues. Well see what happens when I go to the Eibach springs and Koni shocks.
Bowtie good! Blue oval not so good! Bob in the PRK
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02-13-2006, 11:24 AM #11
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Black- 1998 Trans Am WS6
well remember, as long as you follow the guidelines of what i posted and keep the overall diameter the same, and you keep a 9.5" wide tire, then lowering shouldnt be a problem because WS6 cars are 9.5" wheels and plenty of them are lowered.
Good luck
-Scott
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