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I'm very happy with the Yokohama AVS ES100 205/60R14 that I'm running on my GTV.

The original tire size on my '86 Spider is 185/70R14 with a diameter of 24.2 inches. The Toyos have a diameter of 22.4 inches. I would think that 1.8 inches smaller would look worse (although the tires are lighter). It also lowers the gearing of the car.

I have been looking at purchasing either Falken Ziex ZE-912 195/65R14 with a diameter of 24.1 inches or Yokohama AVS ES100 205/60R14 with a diameter of 23.7 so that my gearing and speedometer stay close to stock.
 

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Very interesting. According to the tire size calculator, it should be off by almost 5 mph. You are travelling at 55.7 mph when the speedometer reads 60. This is probably a moot point since I've never owned an Alfa where the speedo wasn't out by over 10% anyway. My bigger concern is always that the engine is reving almost 8% faster at a given speed.
 
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