I'm lowered with H&R Sports, so 1.5 and 1.25 or something in that range.

Right now my car sort of looks lowered but there is a gap. I used the tire calculator at miata.net and it says my speedo is 6% or so off (205/65/15 --> 205/50/16).

I'm worried if I put on tires with a larger sidewall they will not look as low-profile.