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Does tire width adversely affect gas mileage?

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Old Mar 25, 2014 | 10:39 AM
  #46  
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Damn, those FiveAxis wheels are nice...

Once I add 15mm spacers - my wheel specs will be:
Front = 19.8.5" +30
Rear = 19.9.5" +36

Would I have any adverse effect in going from stock tire specs to 245/35 and 275/30/19... Road Noise, Gas Mileage Decrease, and Ride Quality?
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Old Mar 25, 2014 | 11:53 AM
  #47  
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Originally Posted by MYISF
I am getting aftermarket wheels...not sure exactly which ones yet but as an example I am looking at this set up:

Front = 19x8.5 +35mm
Rear = 19x9.5 +38mm

The guy I am working with seems to know his stuff and is strongly suggesting the following:

Front = 245/35/19
Rear = 275/30/19

He says they will fit with "no rubbing" although he may have to heat up the plastic under the front fender to make sure? I know many have done this and it is really not a big deal.

However, I want to lower the car eventually...Tein or Eibach??? And I am thinking that his setup (tires) would have issues so I am thinking about going with this setup:

Front = 235/35/19
Rear = 265/30/19

This would bascially be the same setup as Joe Z... see https://www.clublexus.com/forums/is-...-f-wheels.html and he seems to not have any problems and this is a daily driver.

So if I go with my setup what would be my issues other than the fact thay this setup would be smaller diameter causing my Revs per mile to increase...and what does that really mean and how does it affect the car...also this setup would be lighter (total weight) as the tries would be lighter that the 245/275 set up...thanks.
Look at the tire load ratings in the tires specifications. If you have a daily driver, not a lowrider or a show car, you don't want the replacement tires load ratings to fall below stock.

Load ratings for XL rated tires

Stock Front - 225/40/19 - 1433 lbs. - Load range 93Y
245/35/19 - 1433 lbs. - Load range 93Y
235/35/19 - 1358 lbs. Load Range 91Y(non- XL - 1201 lbs - Load range 87Y)

Stock Rear - 255/35/19 - 1565 lbs - Load range 96Y
285/30/19 - 1653 lbs - Load range 98Y
275/30/19 - 1565 lbs - Load range 96Y
265/30/19 - 1433 lbs - Load range 93Y

Lou

Last edited by flowrider; Mar 25, 2014 at 11:59 AM.
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Old Mar 25, 2014 | 12:01 PM
  #48  
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Originally Posted by ISFpat
Enlighten us how I/H/E will give us better mpg.

With actual facts, not bro-science, butt dyno etc.
Greater efficiency always equals greater efficiency - Don't know how else to explain it

Tell me why it's not true

Lou
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Old Mar 25, 2014 | 02:33 PM
  #49  
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Originally Posted by lowrideraz
Greater efficiency always equals greater efficiency - Don't know how else to explain it

Tell me why it's not true

Lou
I'm not going to even bother responding to this.
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Old Mar 25, 2014 | 03:48 PM
  #50  
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^^^^Sorry - I shouldn't have wasted my time

Lou
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