4.50L-15 front & 5.00L-15 rear. Bias ply Dunlop vintage racing tires. Great rubber for this car and my usage: very driftable and very predictable, makes it easy to steer with the right foot. They will begin to slide much earlier than radials, but they never surprise. I like being able to drive it fast, but in an '50's sort of way. To me it is just a lot more fun than getting a few more MPH of corner speed. Sure the new S2000's and Z-cars are faster up in the canyons, but when we stop at the top they always tell me about how much fun it looked like I was having, hanging out the tail and counter steering around every corner. The car is so open that sometimes I can smell the burnt rubber as I am drifting.
Besides, the car looks better on original type wheels and tires IMHO.