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Offset for 15" rota wheels, yes i did a search first. LOL !


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#1 WogsRus

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Posted 06 January 2015 - 02:02 PM

Ok yes i have read all the posts i cound find and still non the wiser.

I have a 260z 2+2 and am looking at some rims.

Ideally, i am looking at 15x7 Rota RB which come in a 15x7 with +20 ofset.

Question i have, will these fit under the guards of a stock Z without rubbing, which has 1" lower springs then stock ?

I don't want to run flares or spaces, so an help and photos would be greatly appropriated.

What is the ideal offset for a 15x7 rim to put under a z???

#2 Agno

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Posted 06 January 2015 - 04:06 PM

A +/-0 offset will easily fit under the guards of a Z without scrubbing or rubbing. +20 will either come very close or will rub on the strut.

#3 pauly_adams

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Posted 06 January 2015 - 04:15 PM

im with agno, they may fit but it will be close to the rear strut, +10 or 0 would be better

#4 d3c0y

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Posted 07 January 2015 - 07:43 PM

go 16 x 8 +4 if you can find them, they fit perfectly and will have a better selection of tyres.

#5 peter t

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Posted 08 January 2015 - 06:38 AM

Only thing is any bigger than 15x6 are illegal in Qld anyway. You are only allowed 1'wider and 1'larger dia here. 8)

#6 oldmates260z

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Posted 08 January 2015 - 07:53 AM

Only thing is any bigger than 15x6 are illegal in Qld anyway. You are only allowed 1'wider and 1'larger dia here. 8)


Is that an absolute? I wonder if you can you get a engineers certificate to get approval?

#7 WogsRus

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Posted 08 January 2015 - 07:55 AM

all good down here in tassie, kinda anything goes

#8 peter t

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Posted 08 January 2015 - 08:30 AM

Is that an absolute? I wonder if you can you get a engineers certificate to get approval?

Not sure but the guy who did mod plate for gearbox swap told me that was the "Legal limit" for wheels in Qld.

#9 oldmates260z

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Posted 08 January 2015 - 08:55 AM

You had to do a mod plate for a gearbox change, which gearbox did you fit? Obviously needed modifying to fit?

I will have to check with my mod plate guy too  :D

#10 peter t

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Posted 08 January 2015 - 09:07 AM

You had to do a mod plate for a gearbox change, which gearbox did you fit? Obviously needed modifying to fit?

I will have to check with my mod plate guy too  :D

Check my build thread. ;D

#11 dat2kman

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Posted 08 January 2015 - 09:45 AM

Show the Mod/Engineer guy the official factory documentation showing that they had, as optional, 15x7 rims, along with 14x10's on rear, 14x8's on front.
The great majority of md/engineer types take the conservative approach.

And yes, WogsRUs, a plus 20 on a 15x7 will rub on your spring perches
You will need something with a backspace measurement of 105 mm or less
Those rims at +20 will have a backspace f 122.5mm.

Could fit longer studs and 15-20mm thick spacers,,,,,,, but that is illegal, unless the spacers are mechanically fixed to either the rim, or the hub.

#12 oldmates260z

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Posted 08 January 2015 - 10:58 AM

Just spoke with the guy that did my mod plates:

"The rules are now national, not state by state anymore. You can increase the wheel centres (across the car) by 25mm and wheel (rim not tyre) by 25mm"

So this means you need to spread the width inward as well as outward to keep them legal. That become a challenge if you want it "Legal".

dat2kman.....where do we find the factory documentation?

#13 dat2kman

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Posted 08 January 2015 - 11:33 AM

Docs are the JAF ( Japanese Automobile Federation) approvals, detailing the available options.
This doc then went to FIA, for worldwide approval.
Cars, with certain optional items, are able to be legally driven on public roads.

Rim diam increases are limited, but width is fine.
The first thing any protective Engineer will say, "oh, this is for racing, not valid" you then explain, cars under this are for public road use and registration. That stumps them.

I have stamped copies of these, but f i take pics with camera or ipad, image size s too large for this site.
Re-size? Heard about that, nfi on how to resize on ipad.
Have given up using a regular computer, as not able to see/use them very easily.

#14 oldmates260z

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Posted 08 January 2015 - 11:47 AM

I have stamped copies of these, but f i take pics with camera or ipad, image size s too large for this site.
Re-size? Heard about that, nfi on how to resize on ipad.
Have given up using a regular computer, as not able to see/use them very easily.


If you can be bothered email them to me and I can resize and post (tmamo at live dot com dot au)

#15 WogsRus

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Posted 08 January 2015 - 01:00 PM

Nope, the rules have not been adopted in Tasmania and as it is its up to discretion of the vehicle assessor.

Either way 15x7 with zero offset it is.

#16 Ledge

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Posted 08 January 2015 - 01:09 PM

Scroll down to Fairlady Z
Although its a Watanabe data sheet. offsets are offsets

http://www.watanabe....tching_data.pdf

#17 d3c0y

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Posted 08 January 2015 - 04:12 PM


http://www.infrastru...Jan_2011 v3.pdf


Here are the actual laws, starting at about page 20 for any states that use NCOP. Most of it pertains to maintaining tyre sizes and not really the wheels...

#18 WogsRus

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Posted 19 January 2015 - 09:15 PM

ok so what about 15x7 with a +12 offset?

Anyone

#19 dat2kman

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Posted 19 January 2015 - 09:34 PM

7" wide = 180mm. Divide by half  = 90 mm centreline then add the 12 mm offset to give backspace measurement of 102 mm.
They will clear suspension. Run a 205/55 tyre.

#20 silvaghost23

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Posted 19 January 2015 - 11:39 PM

Try this website:

http://www.willtheyfit.com

I have a 15x8 with 0 Offset running 225x50 Toyo R888's on the front. Should fit under the guard in front, but only just, not sure about the rear.




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