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| WHEEL CLASS? http://forums.ctzcc.com/viewtopic.php?f=4&t=6554 |
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| Author: | Frank T [ Fri Dec 23, 2011 10:33 pm ] |
| Post subject: | WHEEL CLASS? |
I would like to ask some of our knowledgeable members to give us all a free WHEEL CLASS and discussion here on the website. For example, I would enjoy learning about how lug patterns are measured, what the measurement numbers mean, and everything you know about off-set. Please keep the terms simple, for us simple folks. Thanks in advance! Frank |
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| Author: | Paul [ Sat Dec 24, 2011 8:44 am ] |
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Lug patter= it either fits, or it don't.  Actually thanks Frank, this info would be nice to know, it's something I never dabbled with. Also knowing from the ones who have done it, to see what rim and tire combo is the best choice for original, or if you have modified your suspension.
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| Author: | Brotus7 [ Sat Dec 24, 2011 9:25 am ] |
| Post subject: | |
Bolt pattern is also called PCD, post center diameter. It's the diameter of the circle created thru all the studs and centered on the hub. With an even number of lugs, it's easy to measure, it's the distance from the center of one stud to the center of the opposite stud. With 5 lug, it'd be easier to measure the distance from the center of the hub to the center of a lug, and multiply it by 2 since its hard to measure the diameter. Backspace is the distance from the back of the wheel to the hub face. This will tell you how close the wheel will come to hitting the strut. Offset is the distance from the center of the wheel width to the hub face. What makes this more fun is that the offset (ET) is usually measured in millimeters. You measure it by measuring the backspacing (BS) and the wheel width (WW). ET= (BS-(WW/2))*25.4 Positive offest means the wheel hub will sit towards the outside of the wheel, so the wheel sits further in. Negative or lower than stock offset pushes the wheel further out. 
-Andy |
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| Author: | Brotus7 [ Sat Dec 24, 2011 9:36 am ] |
| Post subject: | |
For example, stock on a 280ZX turbo is 15"x6 with a +12MM offset. To get the backspace, you can simply measure it if you have the wheel, or calculate it. Convert the offset to english (12mm/ 25.4 mm/in) ~.5". Take the wheel width, divide it by 2, and add the backspace. Ok, now you're looking a diamond racing wheels, you want some 15x8's with a 5 " backspace, how do you convert this to offset (which will affect of the car turns, excessively different offset will wear out bearings prematurely. Ok, so, WW= 8. BS-WW/2 = 5-8/2=1". So you have a 1" offset, or in metric, 25 mm. |
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| Author: | Frank T [ Sat Dec 24, 2011 11:00 am ] |
| Post subject: | |
 WOW. Thanks!!! It'll take me a few minutes (weeks) to digest all that and get a working mental picture of it! This is the first time I have ever heard these formulas, and I took AutoMech when I was a kid.
Valuable stuff! Stick around, Andy ~ pretty sure there'll be Qs! Frank |
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| Author: | Paul [ Mon Dec 26, 2011 7:25 am ] |
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Yes, thanks for all that. Having the formulas is very helpful. I wish all rims would stamp the size on the back. EX..............my Acura rims do, 17 x 6-1/2", 55 offset up front, and 17 x 7" 55 offset in the back. Yea, all that is stamped on there. Very rarely have I seen offset stamped on a rim, but size is common if you look hard enough sometimes. Anything else that that is helpful in this category please add in. Thanks so far.
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| Author: | THORZ [ Mon Dec 26, 2011 1:00 pm ] |
| Post subject: | |
The Ansen wheels (Sprint VNA69) are offered in these sizes: 15x7 (bolt patterns 4x108) or 15x7 (4x114,3) What is correct for a 240z? http://www.customwheelsexpress.com/amer ... p-256.html Thanks for all the stuff Thor |
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| Author: | Frank T [ Mon Dec 26, 2011 1:07 pm ] |
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According to the Duty Experts over on Hybrid Z website, the 240-260-280Z bolt pattern is 4 x 4.5 inches (114.3mm), and will only accept up to a +10mm offset. I think some of our members have gained more offset by using spacers? http://forums.hybridz.org/index.php/top ... t-pattern/ I also notice those ANSEN wheels offer free shipping. I wonder if that means internationally, too? I tried to call them and ask this, but they are closed today (Mon/26Dec) for the holiday. They will reopen tomorrow morning. Frank |
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| Author: | Mark C [ Wed Dec 28, 2011 10:45 am ] |
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Frank T wrote: :shock: WOW. Thanks!!! It'll take me a few minutes (weeks) to digest all that and get a working mental picture of it! This is the first time I have ever heard these formulas, and I took AutoMech when I was a kid. Well Frank when you were a kid, all you had to worry about was the hub diameter and the wheel diameter. If the wheel diameter was too big, it would scrape against the sides of the wagon, and the noise would spook the horses.
Valuable stuff! Stick around, Andy ~ pretty sure there'll be Qs! Frank |
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| Author: | Frank T [ Wed Dec 28, 2011 3:25 pm ] |
| Post subject: | |
Almost true. Actually, it scared or enraged the last few living dinosaurs. 
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| Author: | Gary T [ Tue Jan 10, 2012 12:42 pm ] |
| Post subject: | Z Wheel info |
here's a good link wiht some info http://www.az-zbum.com/information.whee ... ires.shtml |
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| Author: | Gary T [ Tue Jan 10, 2012 12:45 pm ] |
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NAd here's One more , which a higher above picture info came from I guess. There is a calulator built in which may be useful. http://www.gtsparkplugs.com/WheelOffsetCalc.html |
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| Author: | Frank T [ Tue Jan 10, 2012 4:11 pm ] |
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Great stuff! Thanks for all this. Thor, I called American wheels to ask about shipping, and they said they just shipped a set of wheels to Germany ~ was that you??? I have to wait until the boss comes back to work tomorrow to know how much shipping would cost. It's free in the USA and the worker I spoke with says it's "a little bit" to Germany. Frank |
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| Author: | THORZ [ Thu Jan 26, 2012 11:50 am ] |
| Post subject: | |
Frank T wrote: Great stuff! Thanks for all this.
Thor, I called American wheels to ask about shipping, and they said they just shipped a set of wheels to Germany ~ was that you??? I have to wait until the boss comes back to work tomorrow to know how much shipping would cost. It's free in the USA and the worker I spoke with says it's "a little bit" to Germany. Frank Oops, no, not me. Who then? Interesting to find out. Do you know more about the "little bit"? Thanks for all and all the advices here. Great club! |
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