Join Date: Aug 2016
Location: Chicago, IL, USA, North America, Earth, Sol System, Sector ZZ9 Plural Z Alpha, Milkyway, Universe
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Mazda OE wheels are either 16x6.5 or 18x8 both ET50. I can't find it stated anywhere but if the hubs are anything other than 67.1 mm, I'll eat my hat.
I wouldn't go crazy with offset if you're going to lower it unless you want to pull the plastic wheel arch cladding off or rub the fender liners.
I've seen TireRack guarantee fitment of 16x6.5 ET55 steelies. I ran 18x8 ET38 with some old 225/50-18 snow tires (leftover from my previous car, about 1.5% larger than stock) last winter and had minor rubbing on the fender liners at full steering lock.
If you're in the US (and possibly Canada) you can go to TireRack.com and/or DiscountTireDirect.com, enter your year/make/model/trim and it will show you only what they know will fit. If you buy both wheels and tires from one of them they will mount/balance them for you before shipping.
As far as tire sizes, both 215/60-16 and 205/65-16 should work.
2016 CX-3 GT iAS AWD, Soul Red Metallic on black
2017 MX-5 RF Launch Edition
2005 RX-8 Sport Sunlight Silver under Cone Rash (because racecar!) -- SOLD!
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Last edited by NotAPreppie; 11-08-2017 at 11:18 AM.