16X8 tire size question?
Registered User
Joined: Oct 2003
Posts: 187
From: ill
Re: Re: Re: Re: winter driving
Originally posted by ShelbyZ28
The second number in the tire size (the side wall height or 50 in this case) is a percentage of the first (the total width 225 in this case). 50% of 245 is bigger than 50% of 225 so the 225/50/16 has a smaller diameter than the 245/50/16 thus it spins faster causing the speedo to be off 3.1%. So getting a 225/55/16 you have 55% of 225 instead of 50% so the diameter is bigger. Its still not exactly the same as 50% of 245 but its close enough to not be noticable. This website will show you how much different tire sizes will cause the speedo to be off:
http://www.miata.net/garage/tirecalc.html
Bryan
The second number in the tire size (the side wall height or 50 in this case) is a percentage of the first (the total width 225 in this case). 50% of 245 is bigger than 50% of 225 so the 225/50/16 has a smaller diameter than the 245/50/16 thus it spins faster causing the speedo to be off 3.1%. So getting a 225/55/16 you have 55% of 225 instead of 50% so the diameter is bigger. Its still not exactly the same as 50% of 245 but its close enough to not be noticable. This website will show you how much different tire sizes will cause the speedo to be off:
http://www.miata.net/garage/tirecalc.html
Bryan
so if it was 45 or 50 percet of the sidewall of a 245 tire
then the spedo wouldn't change.
Administrator
Joined: Nov 1998
Posts: 71,098
From: Hell was full so they sent me to NJ
Re: winter driving
Originally posted by zoso1959
......the firestone bliztrac tire mounted & balance $118.00 each.....
......the firestone bliztrac tire mounted & balance $118.00 each.....
For a snow tire application, a narrower tire often provides better traction in the snow. Is the edge lugs that develop most of the traction, not the tread. Too wide a tread just keeps the tire from sinking into the snow, where the side lugs can grip.
I ran a set of 225/55-16 Blizzaks on a set set of takeoff Z28 salad shooters for one winter - all four wheels. Looked like crap, but they were definitely wayyyy better in the snow than the 245/50-15 GS-C's. But on dry pavement, they had little traction. I'd get left at the lights spinning, getting pulled by mom 'n pop Buicks.....
Administrator
Joined: Nov 1998
Posts: 71,098
From: Hell was full so they sent me to NJ
Re: Re: Re: Re: Re: winter driving
Originally posted by zoso1959
THANKS
so if it was 45 or 50 percet of the sidewall of a 245 tire
then the spedo wouldn't change.
THANKS
so if it was 45 or 50 percet of the sidewall of a 245 tire
then the spedo wouldn't change.
You need to keep the outside diameter of the tire exactly the same as the stock 245/50-16. And that is about 25.65". You can use a 275/40-17, a 315/35-17 or a 285/35-18..... they are also very close to 25.65" outside diameter. And you can use a 225/55-16, that is only a few hundreths of an inch larger than stock.
If you use any other sizes, you need to check the outside diameter.
225/45-16 = ~24.86"
255/50-16 = ~26.04"
You can get the actual outside tire diameter for the specific brand and tire size you are looking at off a site like Tire Rack. Or you can calculate it, using a formula we can give you, or using an online tire calculator.
Registered User
Joined: Jan 2001
Posts: 411
From: Lafayette, Indiana
Re: Re: winter driving
Originally posted by Injuneer
Would that be the Bridgestone Blizzak?
For a snow tire application, a narrower tire often provides better traction in the snow. Is the edge lugs that develop most of the traction, not the tread. Too wide a tread just keeps the tire from sinking into the snow, where the side lugs can grip.
I ran a set of 225/55-16 Blizzaks on a set set of takeoff Z28 salad shooters for one winter - all four wheels. Looked like crap, but they were definitely wayyyy better in the snow than the 245/50-15 GS-C's. But on dry pavement, they had little traction. I'd get left at the lights spinning, getting pulled by mom 'n pop Buicks.....
Would that be the Bridgestone Blizzak?
For a snow tire application, a narrower tire often provides better traction in the snow. Is the edge lugs that develop most of the traction, not the tread. Too wide a tread just keeps the tire from sinking into the snow, where the side lugs can grip.
I ran a set of 225/55-16 Blizzaks on a set set of takeoff Z28 salad shooters for one winter - all four wheels. Looked like crap, but they were definitely wayyyy better in the snow than the 245/50-15 GS-C's. But on dry pavement, they had little traction. I'd get left at the lights spinning, getting pulled by mom 'n pop Buicks.....
. But if they are good in the snow I'll deal, thats the sacrifice I have to make I guess. That sucks they have poor traction but its only 3 months out of the year.
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