Potenza Gets Optional Miata Spot (Akron/Tire Review) The Bridgestone Potenza RE050A run-flat has been tapped as an optional tire for the 2006 Mazda MX-5 Miata. Advertisement ByTire Review Staff on January 27, 2006 The tires, in size 205/45R17, will be supplied by Bridgestone Corp. in Japan.AdvertisementClick Here to Read MoreAdvertisement The Bridgestone Potenza RE050A carries a UTQG rating of 140 for treadwear, A for traction and A for temperature. Advertisement In this article: Click to comment News: K&M Names Park Tire 2021’s Top Shop at Virtual Conference News: Dunlop Motorcycle Tires Announces Price Increase News: Bridgestone Helping Advance Natural Rubber Alternatives People: Up Close with Bridgestone’s Riccardo Cichi Advertisement WEBINARS Watch a webinar for free on-demand! PODCASTS Listen to the latest episode on "What's Treading". SUBSCRIBE Get the latest news in Tire Review World Tire Report.