I run the Yoko Avid Envigor ZPS. Size 195/55r16. This is a run flat which I feel is very important on the dark side. I see a mention of a 185/60r16 in this thread. That is not a run flat tire per available options. I chose my Yoko over the Bridgestone Driveguard due to tread pattern being symmetrical on the Yoko. I have a buddy running the Bridgestone so we're kind of doing an A/B test on performance and longevity. Either way, the size is 195/55r16 for dark side and you SHOULD only use run flat to protect against blow outs.