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Wheel size: 18x7.5
Bolt Pattern: 5x114.3
Center bore: 67.1mm
Lug Size: M12 x 1.5

My steel winter wheel/tires from my 2011 elantra fit so, I'd hazard a guess it has been carried over from the MD generation. Fairly standard setup.
 

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I'm assuming for a nice flush look we need something around 45-50 offset.
 

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Offset would really depend on the width of the wheel, if you want to step it up to a 8-8.5 inch for more of a contact patch that will change, I have always used Online Wheel and Tyre Fitment Calculator. Offset, Tyre Stretch and Speedo Error | Will They Fit along with www.tyrestretch.com to calculate proper fitment for customers, as well as my car, once you get it figured out and have taken proper measurements from your car, both inside and out, it is pretty straight forward, if anyone ever needs a hand please let me know and I will do my best to get you sorted!
Tyson
Hey Tyson, I'm trying to get Michelin PS4S's for our car but they only come in 245/40 for 18" wheels. I like the ride comfort of the 18's, do you know if 8.5" wheels will be too wide for our cars? Ideally I'll just pick up a pair of 18x8.5's and use them with the PS4S's for summer and toss on the stock ones for winter until they wear down, then get winter tires. If 8.5" isn't too wide for the car, any idea what offset I'd want?
 

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Right now I am running 18x9.5 +38 all around with stock 225/40 tires. I measured the space from inner rims to shocks, front has about 10mm left, rear about 15mm. According to the wheel calculator my new setup says it sits 8.4mm closer to shock than stock wheels. Your proposed setup says 12.7, so that definitely will fit fine. But i recommend running +50 offset, not 55. You'll have a better look on the outside. Stock wheels are sunken into the car about 20mm front and back. Your wheels will be 12.7mm out, so you'll be barely flush with the fender. If that's what you want, then you're good. But with +50 offset you'll be able to run wider tire such as 245 not worrying about the inner clearances much.
 

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I think I have settled on Enkei RPF1 17x8 +45 with 245/40R17 Hankook RS4's for my occasional street/track setup. I'd like to go with a wider wheel but they don't make anything with a higher offset than 45.
 

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I weighed all 4 wheels as I put them in storage. 49.6, 48.7, 48.5, 48.7. Wheels only had 600 miles on them. The 49.6 was a front and I had just driven so perhaps it had a higher pressure which added weight?
Air won't add weight. :p

I'll be adding to this on Monday when I weigh a stock wheel without tire. :cool:
 

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Just weighed a stock wheel: 25.8 lbs

On a very accurate calibrated scale.
 
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