xxr 513

[Gregs672000]

hey greg have you considered WORK style wheels?
they do have gold spokes available
here is what 15x7 0 offset looks like, and what was done to fit
http://www.311s.org/phpBB3/viewtopic.php?f=34&t=10539" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false;

Those are interesting as well. Not radically different from what is on the car now but may be worth looking into, especially if I can go with a wider tire to fill things up. I might paint a bit of the gold out with black to create more separation of the colors... like the outer lip the spokes connect to at the lip, and maybe the larger spaces between the spokes, and use black lug nuts. I did similar stuff to the 280zx wheels to create separation and liked how that turned out. Thanks again for all the input and pics!

[Gregs672000]

Also, did some measurements on the wheels I have... by tape measure the wheel is 7" rim edge to rim edge... is that where you measure it? I thought the 280zx 6 spokes were 6.5... am I measuring in the wrong place? It has 4" of back spacing (haven't converted to mm yet) and a 3/4" spacer. Together they fill the rear flare well and don't rub. I don't think I gain a huge amount of room with the flare because it starts about where the stock fender lip is (no edge to roll however), but there is some extra over stock I believe (will need to compare to the '68 out back).

[fj20spl311]

7" overall is a 6" rim
With the spacer I cal. -7 offset
4-.75 = 3.25
Center is 7/2= 3.5
3.5-3.25=.25
.25*25.4~7 mm i.e. -7mm

8" rim with the same outside is 18 mm offset. That moves the inside in ~ 50 mm.

Flame me I am wrong or just because LOL

[Gregs672000]

7" overall is a 6" rim
With the spacer I cal. -7 offset
4-.75 = 3.25
Center is 7/2= 3.5
3.5-3.25=.25
.25*25.4~7 mm i.e. -7mm

8" rim with the same outside is 18 mm offset. That moves the inside in ~ 50 mm.

Flame me I am wrong or just because LOL

No flame here, even if it turns out wrong! So, given that I am currently at a -7mm offset and we know that works, what offset would work with a 15x8 inch rim? Or a 15x7? Maybe that is what you are saying in the "8 rim with..." statement but I don't quite understand. Are you saying that if I get a rim that has a -7mm offset in a 15x8 size it will move the inside 50mm closer to the spring than what I currently run? And the increase to the outside would be? In my mind I imagine a -7mm offset being different in both directions... I think I would take the overall width of the rim, calculate in the offset and the difference in size (6" vs 8" or 7") to figure out how much more tire will be pushed toward my outside fender... right? Also, does an 8" rim actually measure 9" wide rim edge to rim edge, and a 7" rim actually 8" wide?
Thanks in advance!

[Gregs672000]

OK, math was never my strong point, but I don't understand the calculations I am coming up with here. First, I converted the 7 inch rim to mm, (1" = 25.4mm) then converted the 4" neg offset to mm and subtracted that from the total to get the how many mm inboard it goes and how many mm outboard. 7" measured (6 inch rim) is 177.8mm, 4" is 101.6mm, leaving 76.2mm outboard stock. Forums I have visited say that these wheels are +12 offset (I assume that is mm), and that kinda makes sense if you take half of 177.8 (88.9) and subtract it from 101.6 the difference is 12.7. It's kinda confusing when a 7" wheel is really designated as a 6" wheel when the actual measurement is 7" edge to edge... how do you calculate this!?!?! Somebody please give me a formula for dummies!

[pebbles]

hey Greg, dummy here, WOW my head is spinning. One must determine the amount of space you have to fill first. take a ruler a lay it flat on the drum front to rear. then take a yard stick, cuz they are cheap and you can cut it to length. stand it straight up in the fenderwell so the top just touches the well just below the chrome strip,,,or where it used to be. measure between the sticks. its aproximatley 3.5 inches. if you have more, thats good, then measure from the face of the drum to the leaf spring. should be approximately 4 inches, if you have more thats good too, then we can we determine offset requirements.

A 15x7 is friggin huge on a roadster

and the way you drive,,,(so ive heard),,,a teeny bitOspace between the tire and metal stuff would be wise.

[fj20spl311]

7" overall is a 6" rim
With the spacer I cal. -7 offset
4-.75 = 3.25
Center is 7/2= 3.5
3.5-3.25=.25
.25*25.4~7 mm i.e. -7mm

8" rim with the same outside is 18 mm offset. That moves the inside in ~ 50 mm.

Flame me I am wrong or just because LOL

Lets try this again!

Your rims with the spacer are the same as rims without the spacer with -7 mm offset.
Your rims are 12 mm offset

spacer 3/4" = 19 mm (you always subtract the spacer because moves the wheel outward)

12 mm -19 mm = -7mm

If you want a 8" rim with the outside in the same location as you current wheels they would be 18 mm offset. All the addition width would be to the inside ie 2" ~50 mm

If you have 2 inches of clearance to the inside you are all set.

If you have less then you could go to a 7" rim. If you have more room to the outside then a smaller offset number will move the rim equal amounts to the outside "0" offset wheels would be 18 mm more to the outside and 50-18=32 mm more than your wheels to the inside.

For a 7" wheel the offset would be 6 mm and the inside clearance would be reduced by 1"

BTW 15x7 12mm offset fit a stock roadster so you gained ~ 1/4 inch with the flair most likely a little more than that.

this calculator will include a tire size change.

http://www.rimsntires.com/specs.jsp

[pebbles]

I like that calculator Phil, one can make comparisons.

http://www.rimsntires.com/specs.jsp" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false; sort of a comparison for Gregs wheels without knowing exact dimensions. I think 4.9" back space is pushing it a little. 4.7 may be safer.
awe shucks it defaults back
I input 15x8 +10 205/50 15 and 14X6 + 12 195/60 14

[fj20spl311]

I like that calculator Phil, one can make comparisons.

http://www.rimsntires.com/specs.jsp" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false; sort of a comparison for Gregs wheels without knowing exact dimensions. I think 4.9" back space is pushing it a little. 4.7 may be safer.
awe shucks it defaults back
I input 15x8 +10 205/50 15 and 14X6 + 12 195/60 14

Yes, there are better ones, but I would have to look around...I am sure I bookmarked them, but which computer and which search engine....OMG things are getting dim, I am too old for this...LOL

I think Greg should stick with 15 x 7 plus 15s..I know 205/50 will fit and he might get 225/50s to fit.

[Gregs672000]

Thanks guys! You can see I just don't have the innate math skills to be an engineer (but I can balance my check book!). Looking at pebbles pic brings up the front clearance as well, something I had overlooked. Clearly people are running 15x7s and even larger, but again pebbles pic shows how big that rim actually is. Thanks Phil for putting it in a way I can understand, and to pebbles for the calculator, and to everyone else for their input and advice as always!

[jamesw]

I have 15x7 with +12 and 195/55/15's JUST fit with the stock fender lips rolled up. I don't see how you could fit 205's unless your fenders are pulled/flared and it sounds like Greg's are.

Cheers
James

[Gregs672000]

Ok, so see if I'm an idiot...
A 6" rim is 152mm wide. Zero offset would be 76mm on either side of center.
A 7" rim is 178mm wide. Zero offset would be 89mm on either side of center.
With a -7mm offset wheel, that means that on the 6" (152mm) wheel I have 83mm outboard and 69mm inboard.
In order to match that 83mm outboard number with a 7" (178mm) rim, I would have to have a +6mm offset (89mm-6mm = 83mm), with 97mm inboard.

But, I am also changing tire sizes.

Same logic for the tire sizes, 195/2 = 97.5 either side; 205/2 = 102.5 either side of center.
If I have a -7mm offset now with the spacer on a 195mm tire, then thats 104.5 outboard, 90.5 inboard.
To match that 104.5 outside using a 7" wheel and a 205 tire, I would have to have a -2 offset to equal the 104.5 outboard (102.2 + 2mm), with 100.5 inboard.

So which is it? A +6 rim, or a -2 rim? And that is only the back!

With the front .25" (6.35mm) spacer on a +12 offset wheel that means it is really a +6 wheel. Just going with tire sizes, currently have 91.5mm outboard and 83.5 inboard with a 195mm tire. A 205 would be 100.5 outboard and 104.5 inboard using a 7" + 2rim, right? (102.5 either side at zero offset, 102.5-2=100.5 to the outside).

So, I'm thinkin a 15x7 either +6 or -2 (?) on a 205/50 rear (to match what I have in relation to outer fender, could go a bit further out maybe?), and 15x7 +2 with a 205/50 front. Suppose I could do a 195/50 front if I have clearance or look problems.

Is this right? Part of my goal was to give the rear wheels a fattened up look which usually means a more negative offset wheel to have a wider outside lip, right? Man, this stuff is confusing to me...

[pebbles]

15x7+2 on the front may stick out and look weird. Do you have a bigger than stock front sway bar? 15x7+18 w/195 clears a stock front swaybar. 15x7 +15 is "safe" in front,
sorry,,,,I,,,dont,,,know,, about the other stuff.

[Alvin]

Here is a 15x7 0 offset Konig Rewind on my '67.5, 205/50/15


What it takes to fit them: here they are on a Omni-flared roadster:


[/quote]

Greg's rear flare:


i would run:
15x7 +15 up front 195/50
15x7 +15 back 205/50 or larger

[fj20spl311]

Ok, so see if I'm an idiot...
A 6" rim is 152mm wide. Zero offset would be 76mm on either side of center.
A 7" rim is 178mm wide. Zero offset would be 89mm on either side of center.
.

WRONG WRONG WRONG

A 6" rim is 7" wide on the outside.
A 7" rim is 8" wide on the outside.

GET 15 x 7 in 12-18 mm offset and they will fit with 205/50 x 15s and for the best look, you might want to use a 6-13 mm spacer

If you want to take a chance, get 15 x 7 in "0" offset....might fit or might rub by 1/4" on the flair.

My looking at the calculator tells me the "0"s will fit in 205/50 because the 205s of 7" rims bow out less than the 195/60s on 6" rims, but I have been wrong before!

With "15" offset you could try 225/50s

Only you can tell if you have room to the outside. If you could Add a 6mm spacer and check you clearance, if it fits, you can use "0" offset 15 x 7 rims.