I was offered a a set of the goofy 215-50-15's to try out last yr on my track only miata,I have 4 track days on them and they suck *****.I can't find a pressure they actually work at,grip is kinda ok for about 2 laps then nosedives every lap from there.Pressure gain is nutty every session regardless of starting pressure.

They are so hard wear is amazing as they still look new despite lots of sliding around due to the lack of grip and the frustration that ensues.

If you want a slow cheap'ish tire that will suck on track for a very long time then these might be for you.....

 

Haha awesome! I have some 225/50's of these sitting in my garage. I got them for $80 a piece, so I can't be too mad if they turn out to be as bad as you say.

 

I got some of those when they were on sale for street tires. I have yet to mount them. I just hope they spin less than my current star specs.

 

A little late to reply, but probably still good info.
I've seen a couple of these Achilles tyres in real life and they all seem to be slightly less tall than their given size would indicate.
I'd say these are somewhere between a 225/45 and a 225/50 which should be doable for some.
The only thing keeping me from getting them is that Achilles is the name of the town retard and my mates would make fun of me.

 

I had these on my Catfish at MRLS and I was frankly amazed at how well they worked. Far better than RC-1 or VR-1's I've used, and completely predictable. 160TW, but apparently wear like the TW is much higher. Sean Thomson from Goodwin and Dan Howard from 949 both took the car out and either liked the tires or at least didn't say anything negative about them. They ARE taller, which is what the Catfish needs. I like the gearing better with the tall tires as well, at least if you has trubo.

 

Interesting. I hope to use my 225/50/15 versions this upcoming TA season.