i run my own machine and fab shop have built many race cars. these are not the first wheels i have modded in this way, our datsun rally car needed a similar mod and has had no issuse under the abuse of rally racing. so i am very confident that the strength is more than sufficient. besides i had these wheels i was going to use them on my evo but i ended up selling that car so the wheels needed a good home.
as for tires im running achilles atr sport 225 40 18. i ran these tires on my evo with great results, they are quite sticky and have excelent wet and dry traction.