205-50-17 vs 205-55-16

[Skarbro]

I'll be getting 205-55-16 winter tires soon.* My stock tires are 205-50-17.* That means that my speedometer with the winter tires will be 0.8% too fast due to the different overall radius (when the speedometer says 100 km/hr, I will actually be travelling 99.2 km/hr).

So that means that my odometer will be moving 0.8% too fast as well.

If I travel 10,000 kms on the winter tires over one season, I will be losing 80 kms from my factory warranty.

Total that say over 5 years, that's 400 kms of lost factory warranty.* *:(

[majic]

400/80000 = 0.005

half a percent? are you serious??

so a diameter of the 16" tire is 24.9" and the 17 is 25.1".. take the 17" one.. and say you start with tread depth of 10/32" and you would replace a tire at 4/32" (for easy math) and lets say the treadwear is completely uniform so on average you are driving on 7/32" of tread.. meaning 3/32" are missing.. that alone is 0.09375 of an inch.. lets say 0.1"..

hmm look just by driving a 17" stock tire you lose 200km off warranty (assuming 5 yrs at 10K on the 17" tires)

aren't there other things like global warming, leafs making the playoffs and what to eat for dinner tomorrow night that you should be concerned with? just get a 215/65/16 tire and you'll add some kms to your warranty :-\

[Skarbro]

400/80000 = 0.005

half a percent? are you serious??

so a diameter of the 16" tire is 24.9" and the 17 is 25.1".. take the 17" one.. and say you start with tread depth of 10/32" and you would replace a tire at 4/32" (for easy math) and lets say the treadwear is completely uniform so on average you are driving on 7/32" of tread.. meaning 3/32" are missing.. that alone is 0.09375 of an inch.. lets say 0.1"..

hmm look just by driving a 17" stock tire you lose 200km off warranty (assuming 5 yrs at 10K on the 17" tires)

aren't there other things like global warming, leafs making the playoffs and what to eat for dinner tomorrow night that you should be concerned with? just get a 215/65/16 tire and you'll add some kms to your warranty* :-\


LOL it's just a random thought that I had. Maybe bigger tires are the way to go. :) What's 80,000? I'm assuming you are referring to the factory warranty? Mine's 100,000 kms or 5 years.

[majic]

LOL it's just a random thought that I had. Maybe bigger tires are the way to go. :) What's 80,000? I'm assuming you are referring to the factory warranty? Mine's 100,000 kms or 5 years.


ahhaa.. yah.. so we're talking even less 0.0025% :)

anyway.. get bigger tires or get some 1000 treadwear rating tires :)

[b]

400/80000 = 0.005

just get a 215/65/16 tire and you'll add some kms to your warranty :-\


Thats funny. :) Never thought of that.

[Skarbro]

The slower I can make my odometer go, the better. :D Can you fit 20's on a MZ3? ::)

[majic]

might rub ;)

[Wild Weasel]

On this topic... are the Mazda dealers able to recalibrate the computer's VSS pulse-per-km setting to accomodate different tire sizes?

I know aftermarket ECU tuners can do this on cars they make systems for like the HP Tuners programmer for the Cavalier/Sunfire. Does such a thing exist for Mazdas?