Tire sizing question

[Billy Blaze]

So....someone decided to knife one of my tires.
I figured it would be a good excuse to replace them all with some Azenis.
Right now I have 17x7.5 rims and 205/45/17's on there.
So I am wondering if 205/40/17's would fit as Azenis dont come in the size I am currently running.
also what is the 45 # for width? or height?

Thanks for the help. :)

[MadMerv]

aspect ratio (height)
You should go wider if you're going shorter to keep the same diameter. Probably a 225/40.

[Sharpie]

Sorry to hear that Billy. Did happen in Springtown or at a gig?

[HudsonHawk]

205 is the tire width in milimeters (mm). 45 is the sidewall height as a PRECENTAGE of the tread width. So the sidewall height of that tire would be 92.25mm (9.225cm or 3.64in.). This give you an overall tire height of 24.28 inches.

The 40 would result in a smaller diameter tire that would slightly lower your gearing (higher numerically) and technically would improve acceleration. Your speedometer would also read fast compared to what it is now. To campare to the above the 40 would give you a sidewall height of 82mm (3.2in.). This will give you an overall tire height of 23.46 inches.

Tire one has a circumference of: 76.27 inches
Tire two has a circumference of: 73.74 inches

This is a difference of about 3.3%
This means your speedometer would be about 3% fast and your gearing would be about 3% lower then it is now. At 50MPH that would be 1.5MPH difference.

[Billy Blaze]

aspect ratio (height)
You should go wider if you're going shorter to keep the same diameter. Probably a 225/40.

Would this fit well on the 7.5 wide rim?

[Billy Blaze]

Sorry to hear that Billy. Did happen in Springtown or at a gig?

Well I think I know who did it but it's a long story...a guy who got bumped out of his position at the fire station as a result of how I voted for the officers position.

[Billy Blaze]

205 is the tire width in milimeters (mm). 45 is the sidewall height as a PRECENTAGE of the tread width. So the sidewall height of that tire would be 92.25mm (9.225cm or 3.64in.). This give you an overall tire height of 24.28 inches.

The 40 would result in a smaller diameter tire that would slightly lower your gearing (higher numerically) and technically would improve acceleration. Your speedometer would also read fast compared to what it is now. To campare to the above the 40 would give you a sidewall height of 82mm (3.2in.). This will give you an overall tire height of 23.46 inches.

Tire one has a circumference of: 76.27 inches
Tire two has a circumference of: 73.74 inches

This is a difference of about 3.3%
This means your speedometer would be about 3% fast and your gearing would be about 3% lower then it is now. At 50MPH that would be 1.5MPH difference.

thats a lot of info....cool

[Billy Blaze]

looks like I have a choice of.....

215/40
235/40
or
215/45
225/45

what would you choose for the 17x7.5 rim?

[Keifersmith]

The discount tire website info center page has a massive amount of tire info at http://www.discounttire.com/dtcs/infoHome.do

It even includes a tire Calculator http://www.discounttire.com/dtcs/infoTireMath.dos where you can put in a tire size and get all kinds of info or two different tire sizes and it will tell you all the differences.

[sammm]

Any reason for wanting Azenis? There are much better choices out there these days if you're looking for performance tires.

[POS Racing]

Any reason for wanting Azenis? There are much better choices out there these days if you're looking for performance tires.

+1 Azenis are soooo 2007!

[Billy Blaze]

Any reason for wanting Azenis? There are much better choices out there these days if you're looking for performance tires.

what would you suggest, i actually wanted some TR1's but either couldnt find them for sale anywhere.


The price I found on the Azenis was 98.00 each...which i thought was pretty good for a performance tire.

But if you guys have some suggestions that arent 150.00 per tire or more I would certainly be interested in hearing them.

[Jiggerachi]

Im in the market for tires as well and I found this is priceless for narrowing tire choices.

http://www.miata.net/garage/tirecalc.html

[Billy Blaze]

Im in the market for tires as well and I found this is priceless for narrowing tire choices.

http://www.miata.net/garage/tirecalc.html

Looks like 215/45/17 is close and priced at 113.00 per tire

anyone have a good source to buy these or another suggested performance tire on the cheap?
I dont mind waiting for them to get to me as long as it's not a backorder item

I am interested in what you guys are running....since ditching the Azenis.
I will probably place an order in a day or two.

p.s. I just put my truck in the shop to have th motor rebuilt.....lol, thats the way it goes eh?

[cam76034]

Well I think I know who did it but it's a long story...a guy who got bumped out of his position at the fire station as a result of how I voted for the officers position.

Don't they usually set things on fire when they get pissy?

[sammm]

But if you guys have some suggestions that arent 150.00 per tire or more I would certainly be interested in hearing them.

Not sure of pricing in 17" sizes, but check out the Kumho Ecsta XS, Bridgestone RE11, Dunlop Star, Yokohama AV08.

[Billy Blaze]

Thanks Sammm the KUMHO's look good, i think i will go that route in 214/45/17

[POS Racing]

Keep in mind these are quick wearing performance tires!

[Radio-Active]

You want T1R's. check out these dealers.

Good-Win Racing

East coast Tires

[Billy Blaze]

Keep in mind these are quick wearing performance tires!

Not as bad as R compounds tho right?