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245/45/15 Achilles ATR K Sport

 
Old 06-07-2017, 08:33 PM
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Default 245/45/15 Achilles ATR K Sport



Just saw these new 245/45 achilles ATR-K sport. wondering if anyone has had experience with these before? might be another cool option for 245 if you can fit the 45 aspect ratio.
Thoughts?
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Old 06-07-2017, 08:41 PM
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Originally Posted by Flyinglizard45 View Post
might be another cool option for 245 if you can fit the 45 aspect ratio.
Except we can't -- 23.86" diameter.
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Old 06-07-2017, 11:12 PM
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Too tall for 99.99% of NA/NB Miatas regardless of what anyone else says.
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Originally Posted by codrus View Post
Basically I've come over to the camp of "If something is a reliability problem on the track, just ask Andrew and do what he says".
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Old 06-08-2017, 04:30 AM
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Those would fit an ND miata.
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Old 06-08-2017, 10:37 AM
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How much are they and where can they be purchased? Searched and didn't see them for sale anywhere.
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Old 06-08-2017, 10:40 AM
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Yurop, and cheap.
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Old 06-08-2017, 03:35 PM
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Originally Posted by concealer404 View Post
Yurop, and cheap.
They aren't for sale in Yurop afaik. Only see references in the US and OZ
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Old 06-08-2017, 03:39 PM
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Found them online below...

STREET AND TRACK TIRE | TOYO Tires, ACHILLES TIRES, Race tire, Mazda Miata, Spec 911

Interesting. I'm loving my Maxxis VR1's in roughly the same size. These are tempting for the same price though.
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Old 06-08-2017, 03:44 PM
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245/45 is "roughly" the same size as 245/40 in the same way that a 5" ***** is "roughly" the same size as an 8" *****.
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Originally Posted by codrus View Post
Basically I've come over to the camp of "If something is a reliability problem on the track, just ask Andrew and do what he says".
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Old 06-08-2017, 03:50 PM
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Originally Posted by Savington View Post
245/45 is "roughly" the same size as 245/40 in the same way that a 5" ***** is "roughly" the same size as an 8" *****.
Interesting, please explain. Why would a 5mm height change be that big of a difference? Not being sarcastic, I actually want to understand.

I get the basics of tire height, but I didn't think a 5mm change would be that noticeable.

Thanks!
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Old 06-08-2017, 03:55 PM
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Originally Posted by LukeG View Post
Why would a 5mm height change be that big of a difference?
What makes you think it's a 5mm difference?

I get the basics of tire height


Aspect ratio is a percentage of width.

245/40 = sidewall height of 40% of 245mm, or 98mm.
245/45 = sidewall height of 45% of 245mm, or 110.25mm

Every Miata on a 23" race tire polishes the top of the fender and shock tower. Adding 12mm to that will cause some very serious interference issues which cannot easily be solved.
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Originally Posted by codrus View Post
Basically I've come over to the camp of "If something is a reliability problem on the track, just ask Andrew and do what he says".
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Old 06-08-2017, 04:04 PM
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Originally Posted by Savington View Post
What makes you think it's a 5mm difference?
Aspect ratio is a percentage of width.

245/40 = sidewall height of 40% of 245mm, or 98mm.
245/45 = sidewall height of 45% of 245mm, or 110.25mm

Every Miata on a 23" race tire polishes the top of the fender and shock tower. Adding 12mm to that will cause some very serious interference issues which cannot easily be solved.
Okay, gotcha. Yeah then I have no idea. I was thinking the 40 vs 45 was basically a 5mm difference in height not a percentage. Thanks for the education!
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Old 06-09-2017, 02:28 AM
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These are for sale at Evasive Motorsports. These Achilles are available in the weirdest 15" sizes around. I really don't know what car is their target.
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Old 06-09-2017, 12:35 PM
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Old 06-09-2017, 07:25 PM
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Originally Posted by Chilicharger665 View Post
These are for sale at Evasive Motorsports. These Achilles are available in the weirdest 15" sizes around. I really don't know what car is their target.
Yeah some weird options, I see them mostly on civics and stuff. My buddy just picked up the 215 version of these. Well see how they perform on a weekend turbo miata.
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Old 06-10-2017, 01:43 AM
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That size is tall for a NA/NB miata. You want to stay as close to 23" as possible for the reasons that Savington already mentioned.
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Old 06-11-2017, 10:13 AM
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Dammit, thought it was 40 not 50
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Old 08-08-2017, 07:16 PM
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Saw some really good deals online. Even cheaper than federal 595rsrr!
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Old 08-08-2017, 07:21 PM
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Originally Posted by pc9527 View Post
Saw some really good deals online. Even cheaper than federal 595rsrr!
Is it a good deal if it can't be used well?
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Old 09-17-2017, 05:19 PM
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This would fit the rear of FBs and FCs, Z31s, Z32s, probably some Supras...
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