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Interesting discussion. especially because I myself (bieng a one-time design engineer for automotive bearings for the worlds largest bearing company) realize that there are umpteen different things that go into the selection of a product on top of the the load rating itself. In all of the cases, the product selectors will select a product from a range of products that meets/exceeds the needed load ratings AND that meets their aesthetic design requirements and few more non-technical aspects related to vendor-customer relations.

So like I said earlier, unless a product manager from Mazda who was responsible for the tire selection on the Mazda6 speaks, we are at this time simply trying to interpret the way we see it. is 91H/v safe. Absolutel yes. Is it the bare minumum? it is safe to assume it is. But is that the reality? ? ?
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Chikoo, you want me to submit your "design" question to Mazda Japan? It'll be interesting to see if they respond to me. btw, I work for a japanese company that supplies factory automation systems, and Mazda is one of our customers....sooo they might actually give me real answers or blow me off, in which case I can try to go through my company channels....

You want to pick a fight, posttosh, fine. You seem obsessed with proving me wrong to the point you will make unprovoked snide comments toward me. You are pathetic.

MadBiker, you really want to take advice from this guy?
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Hey Toyoguy, I was waiting for you to chime in. I am gathering info right now, any good info on whether 215/55R16s will fit on my '05 Atenza 23S will fit or not. That's it. Wonder if Crossbow is seeing this discussion....
 

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Discussion Starter #62
Hey Toyoguy, I was waiting for you to chime in. I am gathering info right now, any good info on whether 215/55R16s will fit on my '05 Atenza 23S will fit or not. That's it. Wonder if Crossbow is seeing this discussion....
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From a dimensional perspective, I don't see why not. That size falls within the -2%,+3% guideline we follow in the US. However, I don't know what kind of restrictions are in place in Japan with respect to changing sizes. Some countries are pretty restrictive on that kind of thing. Personally, if you're going to downsize to 16s to get the extra sidewall protection, then sticking with the same overall diameter size (205/55R16 or 225/50R16) already gives you an extra 1/2 inch of sidewall. Also, are you sure Toyo Proxes4 isn't available in Japan?

Toyo Japan says the Proxes4 is available in Asia, but of course, that might not include Japan.
 

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From a dimensional perspective, I don't see why not. That size falls within the -2%,+3% guideline we follow in the US. However, I don't know what kind of restrictions are in place in Japan with respect to changing sizes. Some countries are pretty restrictive on that kind of thing. Personally, if you're going to downsize to 16s to get the extra sidewall protection, then sticking with the same overall diameter size (205/55R16 or 225/50R16) already gives you an extra 1/2 inch of sidewall. Also, are you sure Toyo Proxes4 isn't available in Japan?

Toyo Japan says the Proxes4 is available in Asia, but of course, that might not include Japan.
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Toyo Guy, I never thought about 225/50R16 - this would be on a 7 in wide rim? Am I being too stuck on the 215 tread width that I already have on my car (i.e. being anal about 215/55R16)? I like that width because it really gives the car that athletic look, as well as good traction.

As for Proxes4, ooh, mean looking tire. but not listed on the Toyo Japan page:
Toyo Proxes Japan (<= Edited this link)
which lists the T1R, CTO1, S/T, R1R and R888. everything but the 4. See what I mean?
 

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Chikoo, you want me to submit your "design" question to Mazda Japan? It'll be interesting to see if they respond to me. btw, I work for a japanese company that supplies factory automation systems, and Mazda is one of our customers....sooo they might actually give me real answers or blow me off, in which case I can try to go through my company channels....

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Please do Madbiker. I am sure Mazda will respond. I remember once in 2000 when I was having problems with my Protege (323) and MAzda USA was not helping me, I was able to get hold of somebody in Mazda Japan who was able to answer my questions.

One BIG difference between the "sedan" made in the USA and the ones made elsewhere is the Tracksize

USA Tracksize: 60.6" for sedans equipped with 205/60/16 tires
----------------: 60.2 for sedans equipped with 215/50/17 & 215/45/18 tires


Asia-pacific specifications: 1550mm = 61.02"


Does this effect the offset? I am sure it does. and why not!!!!




Source:
(http://www.mazdausa.com/MusaWeb/pdf/specs_features/veh_specs_MZ6.pdf)
(http://www.mazda.co.nz/mazda6/specs.aspx)
 

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Hey guys,

Well, i have finally gotten the wife into modding our 04 Wagon, w00t! and since she hasn't been interested untill now, i haven't done much research on wheels/tires.

This is an informative thread and it did answer a few questions, THANKS!, but i have a few more.

We are looking at a set of 5-Zigen GN+ Wheels 17x7.5 42mm or 48mm and a set of 225/45/17 tires.

I see that alot of ppl use this size tire, but i am a little concerned about the .5" difference in overall diameter affecting the speedo (my wife drives alot for her job) [1.9% --- 60mph would now = 58.8mph] I have always matched my tire sizes as close to stock as possible, but the 215 size is throwing me off a little...since reading that a 235 will probably require fender rolling and she's not up for that. Although the 235 size matches more closely the overall diameter of stock...Would a 235 fit without rolling on that 48mm offset wheel?

So, here's what i want. I want the wheel pushed out as far as possible without rubbing (obviously) We will be using a set TEIN basics to lower it, so i will have some *say* in the lowering measurement to avoid a possible rub, but i'll have no say on the damper setting. (which helped me get rid of a slight rub on my Mazda3)

Will i be better off with a 17x7.5 @ 42mm (which i do beleive is pushing it to the limit) or should we go for the 48mm and learn to live with it? (i know it's only 6mm...)

thanks for any help you give me.
 

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I took a shower and i didn't fart...so can somebody get close enough to this thread to help a brother out? Anybody?
 

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.....One BIG difference between the "sedan" made in the USA and the ones made elsewhere is the Tracksize

USA Tracksize: 60.6" for sedans equipped with 205/60/16 tires
----------------: 60.2 for sedans equipped with 215/50/17 & 215/45/18 tires
Asia-pacific specifications: 1550mm = 61.02"
Does this effect the offset? I am sure it does. and why not!!!!
Source:
(http://www.mazdausa.com/MusaWeb/pdf/specs_features/veh_specs_MZ6.pdf)
(http://www.mazda.co.nz/mazda6/specs.aspx)
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The hub face separation on all global models appears to be the same. The wheel offset then determines the track width, measured at mid-width of wheel (or tire). Goal seemed to be to have same 70.1" at outer face of the tires, so wider 215's have 10mm more offset vs 205's.

For USA:

60.2" is for 17" rims, 60 mm offset
60.6" is for 16" rims, 55 mm offset ( 2 x 5 mm / 25.4 = .4" more track width )

If pdf data is correct, mazda6 18 rims are 60mm offset, like 17" with 215's.

For NZ:

60.6" for 16" rims
61.0" for 15" rims only ( 195mm tires, 48mm offset? )

60.6" for 17" rims .... could be typo ... should be 60.2" like US spec.

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Madbiker:

215-55-16 with oem type 55 offset wheels is a great minus-1 choice. You would step down in snow traction with 225-50, as contact width typically gets wider, the lower the aspect ratio ( ie 225-65 usually have much less contact width vs 225-45 ). Use 6.5" rims(oem combo for many US saabs ) and H tires for max comfort, 7" and V tires for more performance.

Rated section width will change a bit with wheel width, as someone noted. But circumfrence will be controlled by the circumfrential belting, and not change with wheel width.
 

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Rated section width will change a bit with wheel width, as someone noted. But circumfrence will be controlled by the circumfrential belting, and not change with wheel width.
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I used to think that, too; intuitively, it makes sense. But in the real world, the circumference changes, too, though not in as predictable manner as section width.

Years ago, on a Nissan, I replaced, on the same rims, a set of 215/55-16 tires with a set of P245/50-16 tires. I had calculated (215 x 0.55 vs. 245 x 0.50) ahead of time that I would be gaining about 8 mm -- less than one-third inch -- in diameter on the mounted tire. That was theory; in practice, the wheels with the P245/50 tires mounted on them were well over an inch taller than the same wheels had been when the 215/55 tires were mounted. When theory is not realized in practice, then it is time to re-examine the theory.

The belts around the tread would seem to be non-expandable. In fact, the mesh from which the belts are made is cut on the bias, and the individual squares created by the warp and woof of the belt fabric can become parallelograms (diamond-shaped) with the longer dimensions of the parallelograms aligned along the circumference and the shorter dimensions across the tread. It appears that it is through that mechanism that the belt can expand.
 

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....... When theory is not realized in practice, then it is time to re-examine the theory.
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True, but you did not do the conclusive test of mounting the same tire on different width rims, so your case could be explained by tire(s) out of theoretical spec.

The side wall acts more like a diaphram, linking the tread to the rim. You can feel this flex messing with a loose tire, or watching one installed. close-up pics of tires in hard corners show as much a 1" lateral tread displacement relative to the rim.

The angles of the steel strands in the read belts are close to circumfrential. What you described is more like old bias ply construction.

http://www.michelinag.com/agx/en-US/produc...bias_radial.jsp

I can't see a drum like rear tire off a Viper changing circumference with a 1" rim width change.
 

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Discussion Starter #75
If we decide to issue a fitment guide for '06 cars, I will remove the disclaimer.
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Please note: Toyo has issued an '06 fitment guide, therefore, I have removed the disclaimer. All information applies to '06 and '07 model years.
 

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True, but you did not do the conclusive test of mounting the same tire on different width rims, so your case could be explained by tire(s) out of theoretical spec.

The angles of the steel strands in the read belts are close to circumfrential. What you described is more like old bias ply construction.

http://www.michelinag.com/agx/en-US/produc...bias_radial.jsp
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The tire fitment of the 245/50 was within spec, to the extent the tire manufacturer (Goodyear in that case) listed it as an approved fitmemt.

Your comment concerning the angles of the strands appears to confuse carcass plies with belt plies. Even in radial tires, the strands of the fabric in the belt(s) usually are angled, and, in fact, the illustrative drawing of the radial tire on the Michelin page you linked to shows exactly that.
 

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Just a question and since I like to be absolutely sure on things relating to my car before I do them, I have stock 16" rims with the stock tires on a US 6. Can I get 215/55R16 put on with no problem? (Tire place near me has the Proxes 4s in that size)
 

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Just a question and since I like to be absolutely sure on things relating to my car before I do them, I have stock 16" rims with the stock tires on a US 6. Can I get 215/55R16 put on with no problem? (Tire place near me has the Proxes 4s in that size)
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If you look at the first post in this thread, 215/55R16 is listed. Therefore it's OK.
 
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I was wondering if anyone could help me out with my rim size question.I want to purchase 19" Axis Hiro wheels, Will this size rim give me any trouble rubbing wise?
 
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