I have done a bit of research on the same subject as I would like to upgrade to 10x19 or maybe even 10½x19 in front.
HRE will provide their whole range for Vipers in either size.
Where it gets a bit trickier is in the tire choice. So far, I plan on staying with Michelin. The problem is there is no directly compatible tire in the same family (Pilot Sport). The only alternative I see as a tire upgrade is 285/30-19 in a Pilot Sport A/S (all season), with a much higher thread wear index (400 instead of 220), slightly different profile, but more water friendly. I will call the specialists at Tire Rack and ask them what they think of this combination, as I do not know if this might create an interference problem with suspension and/or steering components.
Until I track the car with these tires, I cannot give you any feedback on balance, handling, braking, stability and ride comfort (or utter lack thereof).
I understand that down the road Kumho may be coming out with a 345/30-19 tire. To date this would be the only street legal alternative I see to the Michelins, in 19”.
If anybody out there has experience with 10½x19 front rims, I would appreciate some feedback; thanks in advance.
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2005 Silver SRT-10, wonderful platform for future modifications; more to come soon!