Wheels and snow tires - FMVperformance.com : The site for all your Ford Mazda and Volvo needs
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post #1 of 11 (permalink) Old 11-13-2018, 10:08 AM Thread Starter
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Wheels and snow tires

Hello everyone, new to this group, I own a 2014 I grand touring and am thinking about getting snow wheels and tires for winter mountain driving. My car came with 215/45 R18s and I am wanting a more affordable snow option. The guy at the tire shop said I could go with a smaller 205/60 r16 snow tire if I bought matching 16 inch wheels, but when I called the dealership to confirm, the parts guy said my car is designed for the wheel and tire size that came with the car and any other size could void my warranty and cause issues. I think that’s a load of BS - Can anyone help?

Last edited by [email protected]; 11-13-2018 at 10:32 AM. Reason: Clarifying wheels and tires
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post #2 of 11 (permalink) Old 11-13-2018, 10:18 AM
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Yeah, the guy who told you that is full of B.S. right up to the dormant hair follicles on his balled head; if you want to have some fun with him ask him to show you in official Mazda documentation where using 16" rims with the correct size tire will void your warranty. Then ask him what size tire comes on the base 2014 Mazda3 i Sport (here's a hint, it is 205/60 R16).

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post #3 of 11 (permalink) Old 11-13-2018, 10:36 AM Thread Starter
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Thanks you - that’s what I thought. I told him that the sport comes with that size wheel and he said my computer and brakes were “specifically designed” for an 18” wheel right before he tried to charge me $200 per tire for the correct size - unbelievable
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post #4 of 11 (permalink) Old 11-13-2018, 10:51 AM
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Originally Posted by [email protected] View Post
Thanks you - that’s what I thought. I told him that the sport comes with that size wheel and he said my computer and brakes were “specifically designed” for an 18” wheel right before he tried to charge me $200 per tire for the correct size - unbelievable
Ask him to put that in writing and then send it to Mazda of North America.

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post #5 of 11 (permalink) Old 11-13-2018, 11:57 AM
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This has actually been tested in courts. While I am one the defends the right of personal property of a vehicle and some things we should have choice to use and not void any warranty there is a common sence that also say use the auto makers guide for the model and VIN for some choice of parts. I would suggest not to stray from the door jam information that concerns your VIN and vehicle when it comes to tire sizes or your personal owner manual and the information in the section about tires.

You may also want to contact your insurance carrier and talk with them about this as well. It is distinct possibility in some circumstances you may not be covered should a accident happen and anyone claims you have the incorrect equipment on your vehicle. This has also been tested in court.

Either suggestion you can also contact an attorney and verify the validity of information.

Having owned a shop that I sold tire and wheel packages many times as per my insurance carrier stipulated that if the combination did not have a listing in the auto maker that I could only sell the package with a disclaimer and not installed on the vehicle without the disclaimer and not signed then only a carry out sale.

Requesting a dealership to put something in writing as mention is NEVER going to happen for more legal reasons and that they simply don't . Contacting MAZDA you will I am sure get the same information I am responding with or at least similar regarding safety issues and only recommended tire size options.

*a little side note: Theorized; a few of us that are ECU/EFI Performance calibrators have actually seen cells that carry different calibration regarding the ABS same model year with different suspension packages. What this may indicate or at least a few of us have considered is that the ECU/ABS controller may in fact be tire and wheel calibrated and if so it would have limitation to correcting changes if the ABS is activated?



I have been down this road about this information many times on forums and the best advise is to find a used set of wheels or "take-offs" and get a set of winter tires that meets your budget and not take the stupid chance of random uncontrollable events that could really place you in a stressful financial situation or worse because you took less then the best advise on a car forum?



Read this for more information"

Magnuson–Moss Warranty Act (P.L. 93-637)
https://en.wikipedia.org/wiki/Magnus...s_Warranty_Act

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Last edited by M3RacerX; 11-13-2018 at 04:27 PM.
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post #6 of 11 (permalink) Old 11-13-2018, 12:46 PM
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45 series tires are not ideal for snow. 60 series is quite good. I think the only two things you have to worry about are overall diameter (i.e. 215/48-18 = 205/60-16 in diameter) and brake clearance. With too small a wheel you may not be able to clear the brake caliper, at least that's my guess as to the salesperson's paranoia.

I'm pretty darn sure your ECU cannot determine what tire/wheel combo you are using if the overall diameter remains the same.

Tirerack.com is showing a minus-1 sizing for you car as 205/55-17 and a minus-2 sizing for your car as 205/60-16. I typically use a minus-1 sizing to save money and get a more forgiving tire for bad winter conditions.

Also, your owner's manual should show different tire sizes. My son's '07 Mazda3 owner's manual shows FOUR tire sizes:
195/65-15
205/55-16
205/50-17
215/45-18

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post #7 of 11 (permalink) Old 11-13-2018, 03:06 PM
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Quote:
Originally Posted by cleverbutinaccurate View Post
I'm pretty darn sure your ECU cannot determine what tire/wheel combo you are using if the overall diameter remains the same.
.... really but see let me just mention a couple of many things that some ECU's can read and adjust based on wheel/tire rotation values to make programmed calibrated adjustments ...wheel sensors.. crank shaft sensors, speed sensors: the list goes on....... nerd:

I am just curious when some make assumptions about ECU and calibrating, and a specific's ECU capabilities or just what ever "tooner" on the internet claims they can do and offer for an ECU access calibrating werks? cap.... have those assuming actually ever done any ECU/EFI Calibrating adjustments other then uploading canned toons or very minor fueling and timing trims?


My response earlier was only to make sure that most all the FACTS are covered before a choice is made that could be less then beneficial or have negative results.
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post #8 of 11 (permalink) Old 11-13-2018, 03:43 PM
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The fact remains, the various flavors of the 2014 Mazda3 i came with both 16" and 18" wheel sized and tires which mirror each from an overall diameter. There is absolutely no issue switching between the two wheel and tire sizes.

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post #9 of 11 (permalink) Old 11-13-2018, 04:24 PM
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so basically what is being suggested that all tire and wheel sizes if they are all the same measurement regarding say outside dimensions comparing between a 14,15,16,17 ,18 etc there will be no issues...
Boy I am glad I didn't say that....
Lets see... stopping specifications become invalid , handling characteristic change, suspension feel and reaction change etc.

I can list at least about 50 plus Performance related companies and Professional Race car builders that would love to have that kind of information...Basically about 40% of the SEME registry
https://www.semashow.com/

To be better suited for MAZDA's one that competes with MAZDA's. CORKSPORT
https://corksport.com/


How to Get Good Car Repair Advice

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https://www.aa1car.com/car_repair_advice.htm
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Automotive Forums

Another source of information many people use on the internet are automotive forums. There are hundreds of forums dedicated to specific vehicle makes and models as well as more general automotive forums. Forums contain a wealth of information, but also a lot of misinformation and conflicting information.

The typical forum user will post a question in hopes that other forum users will respond and offer an answer or advice on how to solve the problem. But with all forums, there is no guarantee that anyone will respond or that any responses they do receive will be accurate or helpful. It all depends on the other forum members and who posts a response. Many forum users are quite knowledgeable and can provide exactly the kind of answer you are looking for. Other forum users want to be helpful and may venture a guess or offer an opinion that may or may not be accurate or may be totally wrong. In other words, it may be hard to distinguish good advice from bad advice.

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post #10 of 11 (permalink) Old 11-13-2018, 07:04 PM
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Originally Posted by M3RacerX View Post
so basically what is being suggested that all tire and wheel sizes if they are all the same measurement regarding say outside dimensions comparing between a 14,15,16,17 ,18 etc there will be no issues...
Boy I am glad I didn't say that....
No, not at all what I'm saying. For the OPs car, 16" wheels with 205/60 R16 tires AND 18" wheels with 215/45 R18 tires are both factory spec and you can use them interchangeably (assuming bolt pattern, offset, and back spacing are all correct for the car). That said, they will each come with their own associated benefits and drawbacks regarding ride, handling, acceleration, braking, impact absorption.

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