Front tires for slingshot

[jnagle46]

hi everyone, i was wondering if i can put a 245/40/21 on a slingshot these are runflats due to potholes in new england and i am low to the ground and scraping underneath.
i was thinking 8" rim on a 42 mm offset or can i do a 35mm offset.. what has people done and or suggest??? don't want to rub but need to lift off the ground...
thanks,

[TVG]

I will try and forward a tire da