Ford Focus Forum, Ford Focus ST Forum - View Single Post - Lightweight 17" Wheels
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Old 12-25-2012, 11:47 AM   #2
jsr72
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Quote:
Originally Posted by Bolto View Post
After driving a loaner Focus S with 15" or 16" (I'm not sure which it was) and getting 2-3 mpg more than what I normally get with my Titanium with the handling pack, I've decided that getting lighter wheels could have a significant impact on my fuel economy.
Basically figure 5 1/2 lbs off your car's effective rolling weight for every pound you remove from a wheel. So by dropping 7 lbs or so with each lightweight 18" over stock, it would be like removing ~40 lbs from the car.

You might want to just dump your 16" spare for a couple of weeks and see what difference that makes first.

Quote:
Originally Posted by Bolto View Post
One thing I noticed is that the Sparcos are 18x7.5 and the Andros are 18x8, but they both have the same recommended tire width, 215. So does this means that if I kept my current 18" titanium pack wheels, I could switch to 215 tires from the 235 Michelin PS3s?
Possibly, but check load ratings since you'll likely be going to something with less air volume.

Quote:
Originally Posted by Bolto View Post
Finally, would going from 18" wheels with 235/40 tires to 17" wheels with 215/50 tires mess up my odometer? If so, is there any way around that? Thanks in advance!
There shouldn't be a noticeable effect, a couple of percent difference at worst case.

Last edited by jsr72; 12-25-2012 at 02:13 PM.
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