Choosing the Right Size Tire - Page 7 - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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post #61 of 304 (permalink) Old 09-09-2006, 11:01 AM
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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? ? ?
[/b]
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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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?
[/b]
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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post #62 of 304 (permalink) Old 09-09-2006, 01:51 PM Thread Starter
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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....
[/b]
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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post #63 of 304 (permalink) Old 09-09-2006, 02:25 PM
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From a dimensional perspective, I don&#39;t see why not. That size falls within the -2%,+3% guideline we follow in the US. However, I don&#39;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&#39;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&#39;t available in Japan?

Toyo Japan says the Proxes4 is available in Asia, but of course, that might not include Japan.
[/b]
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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post #64 of 304 (permalink) Old 09-09-2006, 03:37 PM
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Chikoo, you want me to submit your "design" question to Mazda Japan? It&#39;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....

[/b]
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_MZ6.pdf)
(http://www.mazda.co.nz/mazda6/specs.aspx)
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post #65 of 304 (permalink) Old 09-14-2006, 02:23 PM
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Hey guys,

Well, i have finally gotten the wife into modding our 04 Wagon, w00t! and since she hasn&#39;t been interested untill now, i haven&#39;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&#39;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&#39;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&#39;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&#39;s only 6mm...)

thanks for any help you give me.


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post #66 of 304 (permalink) Old 09-18-2006, 06:58 PM
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I took a shower and i didn&#39;t fart...so can somebody get close enough to this thread to help a brother out? Anybody?


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post #67 of 304 (permalink) Old 09-18-2006, 11:13 PM
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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_MZ6.pdf)
(http://www.mazda.co.nz/mazda6/specs.aspx)
[/b]
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&#39;s have 10mm more offset vs 205&#39;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&#39;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.

-----------------------

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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post #68 of 304 (permalink) Old 09-19-2006, 11:22 AM
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Does anyone have 225/50/18 +45 offset ?
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post #69 of 304 (permalink) Old 09-19-2006, 04:35 PM
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i have 225/45/18 with +48 offset. no fender rolling.
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post #70 of 304 (permalink) Old 09-19-2006, 05:49 PM
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chikoo, what&#39;s the rim width?


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