Saw this over on the Bird board. I don't know anything about them, but I thought some of running flared cars with 15" rims might have interest:
http://forums.pelicanparts.com/porsche-911-technical-forum/961280-check-out-15-tire-option.html
http://www.motoiq.com/MagazineArticles/ID/4555/Achilles-ATR-K-Sport-Track-Tire.aspx
Achilles is holding a deep pocket discount Summer Kick Off Sale for the ATR-K Sport for two specific 15" sizes. FOR ONE WEEK ONLY! SALE ENDS JULY 1, 2017!
225/50/15: Retail Price = $161.00 SALE PRICE = $80.50
245/45/15: Retail Price = $184.00 SALE PRICE = $92.00
They have 215x50 as well at $74
http://www.evasivemotorsports.com/mm5/merchant.mvc?Screen=CTGY&Store_Code=EM&Category_Code=ACHILLES-ATRKSPORT
Interesting, but no mention of actual treadwear rating or any other comparative stickiness... The Miata and other vintage racers will eat those sizes up.
Looks like great sizes for a GT build.
I see the latest PCA parade rules have limited treadwear in production class to 180.
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