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Hello,

I recently got a 2018 mazda 3 5 door GT. I do not like how far wheels are sunk in compared to fenders. I am thinking of putting 20 mm spacers in rear and 15 mm in front. Ideally it would have been 15 and 10 rear and front respectively, but I do not want to go through the hassle of changing studs. I am on stock springs and wheels so there is decent amount of gap between wheel and fender lip. My only concern is if there are passengers in the rear seat then is spring going to compressed enough that it'll rub against fender lip? Anyone has any experience with spacers on stock spring?
 

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I wouldn't go further than 5mm with stock lugnuts. You'll lose too much thread engagement.
CK
 

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My concern with running anything over 5mm spacer would be premature bearing wear, especially with how the front suspension is set up. It's always an issue with pushing the wheels further out, but spacers put additional stress on the hub as is.

When I had my Grand Prix and I was figuring out my silly wheel fitment (16x7.5 +25 with 225/60/16 tires lol) for a 1.5in drop, I put all my heavy tools and random shit in the trunk to slam it and see how much room I had. I suggest you do the same and measure the gap between the tire and the fender once it's loaded up. That said, 20mm shouldn't be a problem.
 
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