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Old 08-08-2010, 07:19 PM   #1
Craig-STi/GTI/944
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Question Tire Fitment

Can you fit 265 or 275 on a 17" wheel with rolled fenders on an '07 with coilovers?

Also, 225-50-18, which is the rough equivalent to 24/68-18. Stock 225-45-17's are 25.0" tall, the 24/68-18 are 26.7"

What offsets would be recommended for both?

I have 245-40-17 on the stock '07 wheels for now.
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Last edited by Craig-STi/GTI/944; 08-11-2010 at 02:01 AM.
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Old 08-08-2010, 07:42 PM   #2
bhhamblin
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On my wrx I am running an 18x9.5 +35 wheel with a 275-35-18 tire. I have rolled front and rear fenders and camber....
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Old 08-08-2010, 09:46 PM   #3
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No idea how the gr and gd differ but I have 265's on 9" wheels with a 38 offset. I did have to roll the rears abit. Stock susy


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Old 08-10-2010, 08:20 PM   #4
Gonz#75
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Old 08-10-2010, 08:25 PM   #5
Lil' Biggie
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Quote:
Originally Posted by Craig-STi/GTI/944 View Post
Also, 225-50-18, which is the rough equivalent to 24/68-18. Stock 225-45-17's are 25.0" tall, the 24/68-18 are 26.7"
They don't make a 24/68-18. And a Michelin 24/64R18 is much wider than a normal 225.
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Old 08-10-2010, 10:16 PM   #6
wantsti
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You can do anything if you have enough$$$$$$$$$$$$
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Old 08-11-2010, 01:49 AM   #7
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eh, calculations are fun when you are off on one digit....

such are the joys of being up for 2 days straight.

the "64" not "68" comes to be 25.19xxxx", so height and width will not be an issue.



Even if it is closer to a 245-40-18, it will still only be 25.7" OD


Quote:
Originally Posted by Craig-STi/GTI/944 View Post
Can you fit 265 or 275 on a 17" wheel with rolled fenders on an '07 with coilovers?

Also, 225-50-18, which is the rough equivalent to 24/68-18. Stock 225-45-17's are 25.0" tall, the 24/68-18 are 26.7"

What offsets would be recommended for both?

I have 245-40-17 on the stock '07 wheels for now.

Last edited by Craig-STi/GTI/944; 08-11-2010 at 02:18 AM.
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Old 08-11-2010, 02:04 AM   #8
Craig-STi/GTI/944
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Quote:
Originally Posted by Gonz#75 View Post

Thanks Gonz. I should be out a couple times before the season is over...

Long story, but the car is finally being fixed.

This has been the calculator I've been using for years.... http://www.miata.net/garage/tirecalc.html

I like the one you posted much better
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Old 08-11-2010, 12:19 PM   #9
Lil' Biggie
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I have no clue how you came up with a 24cm racing slick being as wide as a 225mm street tire. But here are accurate numbers for a comparison.

MICHELIN® Pilot Sport PS2
Tire Size: 225/40ZR18
Diameter: 25.1"
Section Width (in) on Rim (in): 9.2" on 8" Rim
Acceptable Rim Widths: 7.5" to 9"

MICHELIN® Pilot Sport PS2
Tire Size: 245/35ZR18
Diameter: 24.8"
Approximate Tread Width: 8"
Section Width (in) on Rim (in): 9.8" on 8.5" Rim
Acceptable Rim Widths: 8" to 9.5"

MICHELIN® Racing Slick
Tire Size: 24/64R18
Diameter: 25.3"
Approximate Tread Width: 8.9"
Section Width (in) on Rim (in): 10.0" on 9.5" Rim
Acceptable Rim Widths: 8.5" to 10.0"


MICHELIN® Pilot Sport PS2
Tire Size: 245/40ZR18
Diameter: 25.7"
Section Width (in) on Rim (in): 9.8" on 8.5" Rim
Acceptable Rim Widths: 8" to 9.5"
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Old 08-11-2010, 03:21 PM   #10
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That miata net calculator is decent, but I like this one better:

http://www.rimsntires.com/rt_specs.jsp
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Old 08-11-2010, 04:46 PM   #11
Craig-STi/GTI/944
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You know, the point of a forum like this is to come and get input from others.

Quote:
Originally Posted by Lil' Biggie View Post
I have no clue how you came up with a 24cm racing slick being as wide as a 225mm street tire. But here are accurate numbers for a comparison.
I put up the wrong screen shot, that was for another size I was looking at. Yes, I do know that 24cm = 240mm and that 68cm ~ 25.1" .... damn that base 10 math is like uber hard... I crossed out the whole bit in my original post, which was flawed due to a number of unrelated reasons.

If you had actually read the full post, you would have seen

"Even if it is closer to a 245-40-18, it will still only be 25.7" OD"

I would say more, but I don't want to bring myself down to your form of interwebz forum "pwning". I'm not the only person on here that feels this way.

On a good note, soundofsnow, I agree with you and gonz on the "rimsntires" calculator being much better than miata.net's


... I'm sure some witty retort will follow ...
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Old 08-11-2010, 05:04 PM   #12
Lil' Biggie
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Quote:
Originally Posted by Craig-STi/GTI/944 View Post
I would say more, but I don't want to bring myself down to your form of interwebz forum "pwning". I'm not the only person on here that feels this way.
Whatever, you repeatedly made it seem as if you believed the tires were the wrong size, either height or width. All I did was post accurate information, if this is "pwning" you, then good for me I guess... Stop being a retard!
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Old 08-11-2010, 05:06 PM   #13
Craig-STi/GTI/944
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Quote:
Originally Posted by Lil' Biggie View Post
Whatever, you repeatedly made it seem as if you believed the tires were the wrong size, either height or width. All I did was post accurate information, if this is "pwning" you, then good for me I guess... Stop being a retard!
Is that the best you can come up with?
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Old 08-11-2010, 05:09 PM   #14
Lil' Biggie
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Quote:
Originally Posted by Craig-STi/GTI/944 View Post
Is that the best you can come up with?
Sorry I tried to help... Good luck with your tires.
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Old 08-11-2010, 05:16 PM   #15
Craig-STi/GTI/944
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Quote:
Originally Posted by Lil' Biggie View Post
Sorry I tried to help... Good luck with your tires.
No, Brody and Gonz helped.
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Old 08-11-2010, 07:59 PM   #16
Lil' Biggie
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Quote:
Originally Posted by Craig-STi/GTI/944 View Post
No, Brody and Gonz helped.
No worries, be as bitter as you like. I'm happy as a clam, my new wheels got here today!

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Old 08-11-2010, 09:59 PM   #17
Craig-STi/GTI/944
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Should that impress any of us?
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Old 08-12-2010, 02:51 AM   #18
Lil' Biggie
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Quote:
Originally Posted by Craig-STi/GTI/944 View Post
Should that impress any of us?
Ya, probably as you will need to take a sledgehammer to your car to shove 1.5" smaller wheels under it.
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Old 08-12-2010, 06:59 AM   #19
Craig-STi/GTI/944
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You are running a Rota Grid, correct? So they clear your calipers and brake ducts just fine? Also, how much camber? With the camber bolts and adjustments on the coilovers, I can get quite a bit. This size would be just a "daily" tire, maybe try autocross, but not track. I ran STU last year, so I was limited to a 245 tire with a 140 or greater treadwear rating.

Quote:
Originally Posted by bhhamblin View Post
On my wrx I am running an 18x9.5 +35 wheel with a 275-35-18 tire. I have rolled front and rear fenders and camber....
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Old 08-12-2010, 10:20 AM   #20
06HAWKMAN
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Quote:
Originally Posted by Lil' Biggie View Post
No worries, be as bitter as you like. I'm happy as a clam, my new wheels got here today!


pixors out of boxes stat! I have been waiting to see this wheel in a decent width and offset.......you bastard, you have to much "play" money
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Old 08-12-2010, 02:48 PM   #21
Lil' Biggie
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Quote:
Originally Posted by 06HAWKMAN View Post
pixors out of boxes stat! I have been waiting to see this wheel in a decent width and offset.......you bastard, you have to much "play" money
I dropped them off at my garage at the track, so no pics until Saturday.
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