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Revolution Member
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Discussion Starter #1
So this inquiry is for the ISV/i-Sport owners rolling on 16s....in my case steelies w/hubcaps.

The OEM tire size is 205/60-16. Now that is one skinny (width wise) tire with a tall sidewall (balloon status).

Id like to run a wider tire with lower sidewall but if doing so I know my revs per mile/speedo will be off. Anybody know of an equivalent size to run to the 205/60-16 that wont be off?

If I were to upgrade/upsize to 17 inch wheels, Id still be running 205/55-17....whats with the friggin balloon tire sizes Mazda has supplied the car with?!

I used the Miata tire size calculator and if I go from 205/60-16 to a 215/45-16...heres the skinny:

Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
205/60-16 4.8in 12.8in 25.7in 80.7in 785 0.0%
215/45-16 3.8in 11.8in 23.6in 74.2in 854 -8.0%

*Speedo will be off.
 

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running wider tire on 6.5 width wheel is not good, it will result in too much sidewall incline into the wheel and pull the edges of the tread up. 205 is not that skinny.
If you want, pick up some used 18" mazdaspeed or 2014 18" wheels and run 215/45/18. that is only 0.5% difference in revs per mile.

I think mazda designed the 2014 with 18" wheels in mind so the 16s do need a lot taller sidewall to fill in that wheel well.

225 55 16 is the same revs per mile as 205 60 16 but i wouldn't put it on a 6.5" wheel because I like the sidewalls to be more straight up and down have support for turn-in.
 

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Revolution Member
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Discussion Starter #3
running wider tire on 6.5 width wheel is not good, it will result in too much sidewall incline into the wheel and pull the edges of the tread up. 205 is not that skinny.
If you want, pick up some used 18" mazdaspeed or 2014 18" wheels and run 215/45/18. that is only 0.5% difference in revs per mile.

I think mazda designed the 2014 with 18" wheels in mind so the 16s do need a lot taller sidewall to fill in that wheel well.

225 55 16 is the same revs per mile as 205 60 16 but i wouldn't put it on a 6.5" wheel because I like the sidewalls to be more straight up and down have support for turn-in.
Ah I see thanks for the input/insight. I think Ill just save up and when I need new tires, get some 18s to go with the rubber.
 

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So this inquiry is for the ISV/i-Sport owners rolling on 16s....in my case steelies w/hubcaps.

The OEM tire size is 205/60-16. Now that is one skinny (width wise) tire with a tall sidewall (balloon status).

Id like to run a wider tire with lower sidewall but if doing so I know my revs per mile/speedo will be off. Anybody know of an equivalent size to run to the 205/60-16 that wont be off?

If I were to upgrade/upsize to 17 inch wheels, Id still be running 205/55-17....whats with the friggin balloon tire sizes Mazda has supplied the car with?!
I think I can help here. Mazda must have installed these balloon tires on the iSport in order to assure you get speeding tickets. I got my first speeding ticket in over a decade, and on advise of counsel had my speedometer checked. It is off by approx. -8% and at 65mph on the dynamometer my actual reading is less than 60mph. Based on how far off my 2014 iSport hatch speedo is off I will not hesitate to go with a slightly lower profile sidewall when I pitch my steelies.
 

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Revolution Member
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556 Posts
Discussion Starter #6
I think I can help here. Mazda must have installed these balloon tires on the iSport in order to assure you get speeding tickets. I got my first speeding ticket in over a decade, and on advise of counsel had my speedometer checked. It is off by approx. -8% and at 65mph on the dynamometer my actual reading is less than 60mph. Based on how far off my 2014 iSport hatch speedo is off I will not hesitate to go with a slightly lower profile sidewall when I pitch my steelies.
Wow had no clue it was even off to begin with...thats bananas

Thanks for posting that, so I am tempted to go from the stock 205/60-16 to a 205/45-16, you think thats to low of a sidewall ie to correct the speedo or would I be better at 205/55/-16?

Sucks that the speedo/revs per mile is off but in a way this could be a blessing in disguise because now I can run a lower sidewall lol.
 

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My tires have less than 5k miles so are close to full diameter. I think a 45 tire that is a full inch diameter smaller would look a bit weird in the wheel wells and would not go that far.

Just for giggles I put my OEM Miata wheels/tires on one side and took a picture. They are 205/50/r16. Here is what they looked like:
 

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