I'm 6', if I sit straight up like on the 3 the I would touch the top without a helmet, I actually haven't put it on while in this car... but I now have a couple of inches of clearance, guess I'll give it a try tonight
O wow...I wonder if I'd fit, I'm 6'2". My good friend just got a white 95 Miata (I talked him into getting one and he loves it) and my head is 4-5 inches from the top. Do you know if the 1st gen sits lower? Come to think of it...I have really long legs and a shorter torso, so maybe that's the reason.
I'll have to get my friend on the forums. His Miata has a tan top with tan leather interior (the interior is in amazing condition for 130k miles). The first time he turned on the radio, he turned up the volume too much and scared the s*** out of both of us...there's speakers in the seat's head rests haha.