Zeroing formula?

[Yezinki]

http://www.wheelsmaster.com/rt_specs.jsp

My Corolla 06 has OEM tires 185/65/R14….how do I check for zeroing……& which tires sizes should I go for…..since I plan changing the wheels to 16/17”?

Curious to learn how to use this to zero........I mean how does one calculate.........put in the OEM values in the left.... OEM values 185/65/R14 shows 14 X 7 X ET10.........what does that signify & what do I do next?

Pros & cons of reaching a zero value?

Thanks.

[MR2Jedi]

OEM values 185/65/R14 shows 14 X 7 X ET10

185=tire width
65=sidewall hight
R14=Rim Diameter

14=Rim Daimeter
7=Rim Width
ET10=Offset


By Zero Value are you meaning tires flush with fenders?

[Yezinki]

MR2Jedi,

What purpose does this calculation serve?

ET10= Offset…….is that bad….should ET be 0?

I plan changing the wheels to 16/17” size………will this http://www.wheelsmaster.com/rt_specs.jsp..........be of any help as to wheels/tires selection if yes than how?

Thanks.

[NMGeorge]

Are you talking about tire SIZE? If so, run your calculations here:

http://www.miata.net/garage/tirecalc.html

You can pick various sizes and see how they will affect your speedometer readings. For me, I plan to go to a wider size and try to maintain standard readings on my speedo and odometer. I am looking at 215/60/15 for my new tires - should be real close to my factory stock size of 195/65/15, in regards to the speedo readings. I also have 6.5 inch wide aftermarket wheels on my car that should fit these tires pretty well.

Factory revs (of the tire) per mile = 807, new size (215) = 802

Is this the kind of info you are asking about?

[Yezinki]

Originally Posted by NMGeorge

Are you talking about tire SIZE? If so, run your calculations here:

http://www.miata.net/garage/tirecalc.html

You can pick various sizes and see how they will affect your speedometer readings. For me, I plan to go to a wider size and try to maintain standard readings on my speedo and odometer. I am looking at 215/60/15 for my new tires - should be real close to my factory stock size of 195/65/15, in regards to the speedo readings. I also have 6.5 inch wide aftermarket wheels on my car that should fit these tires pretty well.

Factory revs (of the tire) per mile = 807, new size (215) = 802

Is this the kind of info you are asking about?

Not tire size.......wheel/alloy size.

[MR2Jedi]

Originally Posted by Yezinki

What purpose does this calculation serve?

ET10= Offset…….is that bad….should ET be 0?

it's not bad, but probably not your offset. The smaller the the offset value, the more the wheel goes outward towards the fender.
You need to find out what your stock offset is if you want to bring your wheels flush with your fenders-if thats what you're trying to do.

I plan changing the wheels to 16/17” size………will this http://www.wheelsmaster.com/rt_specs.jsp..........be of any help as to wheels/tires selection if yes than how?

Go 17" x7"rims..
Tires 205/40/17 this will only throw your speedo off about 3mph.(you will be going 3mph faster than your speedo reads.)

[Yezinki]

OK …….now it's clear.........ideally can never be zero?

This is my stock offset......is it good?

Presently am using 195/60/15"............values again are 15/7/ET=10.......but when I measured these alloys they were 8.25" width, this zeroing calculation shows 7".............strange??................plan to change to 16/17".........will keep both calculations into context.

[Yezinki]

The smaller the the offset value, the more the wheel goes outward towards the fender.

10 is a small or a big value?..........smaller the value e.g 5........ the wheel shall get closer to the fender........am I correct....so hypothetically offset should be more for the wheels to remain away from the fender?

[MR2Jedi]

Your offset is NOT ET 10. If it were, your wheels would be sticking out beyond the fenders.

For example: My rear wheels on my MR2 have a +35 offset and they are flush with my fenders. The wheels I replaced(aftermarket) had an offset of +40 and they were 5mm inside the edge of my fenders.
So the smaller the ET value, the further out the wheel will be towards the fender.

If you're not concerned about the " flushness", then get wheels with an offset between +38 & +42. Those should be safe and close to your stock offset.
The closer you get your wheels to the fenders, the wider stance you will have and the better handling you'll have. Looks cool too.

[Yezinki]

185 X65 X 14 …………Offset (ET) =10……….. Width of alloys when measured showed 8.25”, here it shows 7”??

[MR2Jedi]

Originally Posted by Yezinki

10 is a small or a big value?..........smaller the value e.g 5........ the wheel shall get closer to the fender........am I correct....so hypothetically offset should be more for the wheels to remain away from the fender?

Correct.
the larger the value, the more "tucked" inwards from the fender.

[MR2Jedi]

Originally Posted by Yezinki

185 X65 X 14 …………Offset (ET) =10……….. Width of alloys when measured showed 8.25”,

Measured by whom/what ?

here it shows 7”??

where?

[Yezinki]

Why this zeroing formula shows width of the wheel as 7" vs on ground when measured was 8.25"?

[Yezinki]

Originally Posted by MR2Jedi

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Measured by whom/what ?


where?

I measured the alloys & the width was 8.25".

Now using this wheel/ tire calculator width displayed is 7"?

[MR2Jedi]

Originally Posted by Yezinki

I measured the alloys & the width was 8.25".

Now using this wheel/ tire calculator width displayed is 7"?

If the wheels are OEM, they are not 8.25" wide. They are 7".
Measurement must be incorrect. Width is measured fron the inner edge .Not the outer edge.