2eighTZ4me Posted January 29, 2009 Share Posted January 29, 2009 I'm looking for a set of wheels to mimic my current ones so I can put race rubber on them and use them for track only. I don't want to break the bank, doesn't have to be pretty - just functional (and lightweight preferably). I've not found anything at Summit, and don't know where to look. These are really odd sized wheels, as I have coilovers and flares. FRONT = 17x10 5 5/8" backspace, which would be a +16 offset (roughly) REAR = 17x12 5 3/8" backspace, which yields a -16 offset (roughly) I "think" I have the calculations correct. Please correct me if I'm wrong. So - I need to find a set of 17's in a 4x114.3 bolt offset to put race rubber on. ANY ideas?? Also - when measuring wheel width, does one measure from outer lip to inner lip (extreme most portions of the wheel) or from where the bead seats? Haven't been able to figure that one out yet. If so - my measurements above will differ. Quote Link to comment Share on other sites More sharing options...
Evan Purple240zt Posted January 29, 2009 Share Posted January 29, 2009 Your not going to find anything cheap and in those sizes, thats for sure! Pretty extreme fitment! Quote Link to comment Share on other sites More sharing options...
roye@hrewheels.com Posted January 29, 2009 Share Posted January 29, 2009 If you were to say that you have a 10" wide wheel you would be measuring from the bead seat, so a 10" wheel is actually 11" in over all width from outside flange to outside flange. That sounds confusing- Always measure from the bead seats Quote Link to comment Share on other sites More sharing options...
roye@hrewheels.com Posted January 29, 2009 Share Posted January 29, 2009 If you measured from the outside flanges on these wheels that back space measurement would give you ET of +16 in front and -16 in the rear So you would actuall have 17x9 et+16 17x11 et-16 PCD 4/114.3 Quote Link to comment Share on other sites More sharing options...
Leith280zlt1 Posted January 29, 2009 Share Posted January 29, 2009 Check out http://diamondracingwheels.com/drwcustom.html They make steel racing wheels and will make them with custom bolt patterns and offsets. I thought about getting some from them and probably still will in the future for track use. I bought Kodiak racing wheels recently which are very pricey. It's very difficult to find wheels with the deep offsets and 4 lug bolt pattern. Look through the products on the website and give them a call and they'll help you out. The diamond wheels are very reasonably priced although, they don't look all that great. Very plain wheels but very functional. Quote Link to comment Share on other sites More sharing options...
thehelix112 Posted January 30, 2009 Share Posted January 30, 2009 Also look for spinwerkes, they make aluminium versions of diamond racing: series 82 they're called. They're relatively cheap in smaller sizes, 16x10 for example, but dunno about how they compare in larger ones. Good luck, Dave Quote Link to comment Share on other sites More sharing options...
2eighTZ4me Posted January 30, 2009 Author Share Posted January 30, 2009 You guys are great! Let me put on my sleuthing hat and do some research! I'm going to have to re-measure though, as the 17x10's are now 17x9's and the rears are 17x11 instead.....just to make double dog sure.... Quote Link to comment Share on other sites More sharing options...
jeffz Posted January 30, 2009 Share Posted January 30, 2009 Have you tried: http://www.ccwheel.com/files/home.php ? Reasonable prices. Custom sizes. Good tech info too. Quote Link to comment Share on other sites More sharing options...
roye@hrewheels.com Posted January 30, 2009 Share Posted January 30, 2009 I'll vouch for ccw, great company with great service Quote Link to comment Share on other sites More sharing options...
Dudeboy Posted February 1, 2009 Share Posted February 1, 2009 Give Zak a call or email Boze/ZE forged wheels. I have 17 x11 and 17 x 9.5 Pro touring wheels on the way- should be here by Thursday. I still have 4 -lugs , tokico springs,shocks (no coilovers) specs to fit Arizona z car brakes. I order them just after Xmas $1900.00 plus shipping. CCW have some great wheels and great service, I wanted to try something different. Quote Link to comment Share on other sites More sharing options...
2eighTZ4me Posted February 2, 2009 Author Share Posted February 2, 2009 OK - help me out here guys. If I'm measuring from bead seat to bead seat (which I can't do b/c the tires are mounted currently) to calculate width, then would it be safe to say I'd subtract an inch from the overall wheel width? (1/2" per bead lip) to surmise the proper wheel width? That being the case (if true), that would make my wheels 17x9 up front and 17x11 out back. Backspace is still measured from the mounting pad to the innermost lip, so it hasn't changed, but what HAS changed is my offset. Help me out and make sure my calculations are correct. Offset = backspace minus the centerline of wheel. Front = 9", so 4.5" would be the centerline. Backspace of 5.625". So 5.625-4.5= 1.125" correct? Multiply by 25.4 to get mm = 28.575 offset. Rear = 11", 5.5" is centerline, backspace 5.375", so 5.5-5.375=0.125" or 3.175 offset. So, since my fronts are wider on the inside, that makes the offset negative - correct? That would make my rears a positive offset, yes?? Maybe I have this whole thing bassackwards. I'm just trying to nail down what I need to tell the folks at the custom wheel shop... Any help is greatly appreciated. Quote Link to comment Share on other sites More sharing options...
Warren Posted February 2, 2009 Share Posted February 2, 2009 Offset Explanation Their site also has other explanations regarding tire sizing, click on "Info Center" for other items. HIH. Quote Link to comment Share on other sites More sharing options...
jeffz Posted February 2, 2009 Share Posted February 2, 2009 Looks like you got it. It is a basic calculation and the relationship does not change. You really only need to give the wheel maker either the offset and width or the backspacing and the width (besides the diameter of course). They will take care of the rest. Quote Link to comment Share on other sites More sharing options...
z-ya Posted February 2, 2009 Share Posted February 2, 2009 Call Centerline about their overstock specials. I picked up my 16x8 track wheels for $100 each. Two piece welded, and not all that heavy. Very strong. I didn't really care about the style. Quote Link to comment Share on other sites More sharing options...
roye@hrewheels.com Posted February 3, 2009 Share Posted February 3, 2009 When you are using a backspace measurement to find your offset you need to use the overall width of the wheel for the calculation. 17x9 = 10" overall so centerline = 5.0= 127mm (I work in Millimeters) BS= 142.875 BS-CL= 142.875-127= 15.875 offset on a 9" wheel Rear BS-CL= 136.525-152.4= -15.875 on an 11" wheel If you need a detailed explanation PM me and I call you. Roy Quote Link to comment Share on other sites More sharing options...
2eighTZ4me Posted February 3, 2009 Author Share Posted February 3, 2009 Roy - that explains things perfectly! Thank you. Well - I find out now that Diamond Racing Wheels does not make a 17" for cars (trucks only), and the 16" wheels they make are in 8" and 10", and 12". I need a 9" and an 11". Guess I'll be looking elsewhere. I just can't justify nearly $2500 for a set of CCW wheels. Spin Werkes looks like they only have drag wheels, so I don't know what to do at this juncture. I have a very specific fitment need that looks like it will be hard to fulfill..any other suggestions would be greatly appreciated.. Quote Link to comment Share on other sites More sharing options...
fp280z Posted February 3, 2009 Share Posted February 3, 2009 Why do you need 17"s if you're using them for race rubber anyway? If you drop down to 16"s then you can get a set of Real's for relatively cheap in any width/offset you want: https://www.rsracing.com/rscatalog/asppages/rrw-pro616.asp I've been running 16x10 Real wheels from RS on my FP car for 7-years now with no issues. Also, when I was looking around for 15"s I ran across these: http://www.bogartracingwheels.com/wheels/rt4lug.jpg They will custom build any width/offset you want but I suspect the cost to be similar to the CCWs. -Rick Quote Link to comment Share on other sites More sharing options...
2eighTZ4me Posted February 3, 2009 Author Share Posted February 3, 2009 I checked into them. Real only does backspacing in inch increments. I need roughly a 5.5" backspace. I also don't know if 16's will clear my calipers. I have the 4 pot Z32 calipers up front. I will pull one of the wheels off my DD (16x7) tonight and see if it will fit and clear the caliper....however, the backspacing issue could be a problem. Quote Link to comment Share on other sites More sharing options...
Leith280zlt1 Posted February 3, 2009 Share Posted February 3, 2009 I will say that you really need to be careful at this point and make sure you can find rubber for the wheels your getting. It's very difficult to find rubber for that wide of a tire on a 16" wheel. I was told early on when buying my wheels that 16" wheels would perform better, but it was really hard to find tires for 16x12 wheels. So, check into the tires real fast and make sure that won't change anything before you go a whole lot further. Quote Link to comment Share on other sites More sharing options...
2eighTZ4me Posted February 3, 2009 Author Share Posted February 3, 2009 http://www.bobwoodmantires.com/bwttires.php They have plenty to fit 16x9 and 16x11. That's not the hard part. The hard part seems to be finding wheels in 16x9 and 16x11 with the proper 5 1/2" backspace without spending over $500 a wheel. I was just quoted nearly $600 a wheel from Bogart racing wheels....top that off with a +/-$300 piece of rubber......daaaaaaaammmmmm!!! Quote Link to comment Share on other sites More sharing options...
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