I run the 335 35 17's and I love them so far. Any word on some 345 20 20 for my Z06? I run the Invo now and they start to hook at 60-70 mph on good pavement.
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There is no official word from Nitto on these sizes being produced like Travis pointed out. IMO, I imagine they will be releasing the NT05R in sizes 305/35-18 and 315/30-18 as these are popular DR sizes.