205/50/15 aren't an ideal size. Your speedo will show you going about 4% faster than you actually are. (e.g 64.6 when you're doing 60) On top of the typical e30 speedo faster than actual variance, you could be reading over 65 mph when you're doing 60. The slightly taller 205/55/15 is a better fit. Stock Miata wheels would have a too small centerbore. Miata uses 54.1 mm compared to the E30 57.1 mm. However since these are Rota wheels they are probably 67.1 centerbore. In fact, Rota wheels sized for Miata with an e35 mm offset are probably 15x7/4x100/e35/67.1. If so, you would likely need 10 mm spacers that adapt the different centerbores or additional centering rings. In other words, you'll need another $100-200 to make them fit correctly. Of course you might get lucky and they won't rub or vibrate without the spacers or rings. The only way you'll know is to try them out. See if they rub. See if they cause vibration at around 65-75 mph.
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1986 Delphin 528e - Roof rack equipped lumber hauler.
1989 Zinnoberrot 325iX Sedan - I miss this car. (Deceased)
1998 Avus Blau 328iC - Someone else's project now
2008 Platinum-Beige X3 3.0si - Current project
2012 Alpine White X3 xDrive35i - My new snowmobile.
2020 Estoril Blue 440i xDrive cabrio - This car is a blast to drive.
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