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Which alternate size is good fit for 2017 Mazda 6 touring model??
Is P245/45 R19 tire size good??
 

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That size will fit no problem assuming you are on the stock wheel and stock suspension. It is about as wide as you can go on a stock 7.5" wheel. Keep in mind in addition to being wider, it will be a taller tire also and will throw off your speedometer reading.
 
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On a 7.5" wide wheel I think max recommended is a 235/45. The 245/45 from most tire manufacturers calls for a minimum of an 8" wide wheel.
 

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On a 7.5" wide wheel I think max recommended is a 235/45. The 245/45 from most tire manufacturers calls for a minimum of an 8" wide wheel.

I agree that 235 would be a better fitment. However, there isn't an industry standard as far as I know yet like the DOT or RMA that regulate this. My information does show that 245/45 would be a proper fitment for 7.5-9" wheels. I can say that this may depend on where or who you shop with. i.e. people who stretch tires for a living may not care for this safety issue.






Thank you for the quick responses.

OKay. So, ABS and Speedometer is depend on tire's outer diameter. If I put 245/45 tire, it will affect traction control & ABS performance??

Okay. I have to check that one. But 235/45 size tire is for Crossovers/SUVs, not for sedans.

If you look at just the facts and numbers, yes it will affect traction control and abs. Those two features are dependent on the sensors the measure the tires speed; so looking at that data, it will. However, I do have 245/35/20x8.5 on my vehicle which changes up the actual size and width with no issue either. There is a tolerance to this within a percentage, but it varies by manufacture.



https://tiresize.com/calculator/
Tiresize does have a good calculator to give you more info and data on the speedometer changes.
 
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