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Old 12-24-2012, 08:03 PM   #1
Bolto
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Smile Lightweight 17" Wheels

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.

So right now I have it narrowed down to two choices (both are under 20 lbs and $150/wheel, but I would be willing to pay more if the weight loss is good enough), and I like to see what everyone thinks:

1. Sparco Assetto Gara (http://www.tirerack.com/wheels/Wheel..._22&sort=Brand)
A lot of people here seem to have these, so I know that they are proven, but they weight just a little more than the Andros (19 vs 18.3 lbs according to Tirerack). Also, I prefer silver rims like my current 18" titanium rims, but the closest I can get from Sparco is the dark gray or white.

2. Andros Spec D (http://www.tirerack.com/wheels/WheelCloseUpServlet?AFFCODE=AD5&target=runWheelSearch&initialPartNumber=D780510842MS&wheelMake=ANDROS&wheelModel=Spec+D&wheelFinish=Matte+Silver+Painted&showRear=no&autoMake=Ford&autoModel=Focus+5-Door&autoYear=2012&autoModClar=Titanium&filterFinish=All&filterSize=All&filterBrand=All&filterSpecial=false&filterNew=All&filterWeight=W_16_19&sort=Brand)
I like that these weight less and are in the color I want, but I cannot find any information about their quality. Anyone know anything about this brand?

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?

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!


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Old 12-25-2012, 11:47 AM   #2
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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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Old 12-26-2012, 06:29 AM   #3
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Quote:
Originally Posted by jsr72 View Post
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.
x4...

So it's more like driving without an adult male in the passenger seat everywhere you go.

I've got 1500 miles on the ticker and already looking for some lightweight 18's to put on the car over my factory 17's. Either that or just keep these 17's and have them as roadtrip fodder wheels. No reason to mess up a new set.
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Old 12-26-2012, 07:31 AM   #4
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If you keep the same overall tire height it shouldn't effect anything.

P.s - if you decide to get rid of your 18's I may know someone interested :-)
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Old 12-26-2012, 08:11 AM   #5
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Moved to "Wheels, Tires, Brakes & Suspension - Sponsored By Tire Rack"
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Old 12-26-2012, 09:19 AM   #6
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Quote:
Originally Posted by Slo86GT View Post
x4...

So it's more like driving without an adult male in the passenger seat everywhere you go.
No, not x4. Removing 1 lb of wheel weight would be like removing 1.3-1.4 lbs of equivalent mass, per wheel. Doing that for all four wheels, using say 1.38lbs x 4 = 5.5 lbs.

Here's a nifty calculator that does a decent job of estimating rotating inertia for wheels and tires.

The Effects of Rotational Inertia on Automotive Acceleration
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Old 12-28-2012, 01:03 PM   #7
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you can get these in 18x8 or 17x8:
high power silver:
http://imageshack.us/a/img402/8509/pr12hps.jpg
silver
http://imageshack.us/a/img716/4825/pr12silver.jpg

both weigh less than 20lbs. team dynamics prorace 1.2, they are around the $200 mark from perfect circle
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Old 12-28-2012, 01:34 PM   #8
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Somebody had the Sparco Assetto's in 17" up on the Buy-Sell-Trade section of the forums. That might be the clincher.

http://www.focusfanatics.com/forum/showthread.php?t=304933
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Old 12-28-2012, 02:30 PM   #9
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Quote:
Originally Posted by drewts86 View Post
Somebody had the Sparco Assetto's in 17" up on the Buy-Sell-Trade section of the forums. That might be the clincher.

http://www.focusfanatics.com/forum/showthread.php?t=304933
he needs 5x108...newest style focus
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Old 12-30-2012, 07:28 AM   #10
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as you go down in rim size you will naturally go up in profile of the tire. this will naturally give you a greater volume of air in the tire and many benefits. benefits would be a softer more comfortable ride, lighter wheel and the tire will be lighter too, especially if its a lesser width. better gas mileage, drastically improved all wheather handling, tighter tuning radius, less wear and tear on you suspension components and less prone to tire bulges and rim damage from pot holes.
you will lose those i corner g forces though.
i just went through this dilemma. i just ordered a new sfe and just ordered new wheels and tires before i even recieved the car. i ordered the sfe for the all around disc brakes and cant stand the though of hub caps and the tires are know to be awful in the winter so i ordered mono winter 2 wheels and 205/65/15 tires. 94h speed and weight rating. the tire will stick out the same as the 215/55/16 since the wheel offset of 40 pushes it out 10mm over the 50mm stock and the height is actually slightly taller than the original. So you have many choices out there and if you still want a large diameter rim check out centerlines or team dynamics.
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