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Hi everyone! Im a newbie here, driving a MAZDA 6 2017 GS. I have been planning to replace my 17x7.5 stock rims. Got a good deal of MAZDA 3 GT OEM 18" stock wheels but didn't realize its an 18x7. I wonder if it is safe to use and wouldn't it look awful if RIMS is smaller? thank you to all that will respond
 

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depends on what your application is, and if you like the rims.

if you don't want to get bad speedo/odo readings, you'll need to match tire size to keep overall outer diameter similar to oem fitment. the 3 runs 215mm on the 18" wheels (running a 225 will pinch the tires), and will thus provide a little less grip. however, i actually run small OD setup with pinched tires deliberately for racing, where the speedo doesn't matter to me and i need more grip.

i'd personally just get a set of decent junkyard wheels if you can find some, and then run stock 225/45 fitment. but at the end of the day it's up to you if it looks better from the side, or if you think you should sell the wheels to help fund a different set.
 
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