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Topic Review (Newest First)
03-06-2013 09:31 AM
rambleon84
Quote:
Originally Posted by clayton89 View Post
My friend has found a pretty good deal on a set of OZ ultraleggeras 16 x 7 and he currently has 15 inch steelies. He was curious if the increase in contact patch of the tire going from 185 - 205 will offset the increase mpg factor of having lightweight wheels of approx 5lbs lighter?

Thanks for your comments

Edit: He has a 05 4 door focus
Well if worrying about mpg's, that typically means your friend is concerned about money. Even if you gained 1mpg going to lighter wheels, that benefit is going to take a long time to be realized over the cost of the wheels/tires. (a +/-1mpg difference over 10k miles @$3.70/gallon is like $40.[30mpg vs 31mpg, that number gets even lower if you see better mpg than that])

I say if he likes the new wheels, go for them. Ultraleggegras are a far nicer wheel than any stock steel wheel. I also really doubt his mpg decreases (buy them and report back after 1000 miles or so of use!) I lost an mpg or two going from a 15" steel wheel to 17" svt 5 spokes, those are considered relatively heavy though
03-05-2013 06:38 PM
Levi05 Yep. I edited my last post mentioning an article on tire science.
Autospeed.com "tyres, grip, and all that..."
03-05-2013 06:33 PM
felixthecat
Quote:
Originally Posted by Levi05 View Post
If you do some deep research, you will find that wider tires will typically have less rolling resistance. And going to a wider tire doesnt increase the contact patch but only changes the shape of the contact patch (if tire pressures dont change). I get that.

It gets complicated but simple answer is a wider tire alone wont hurt fuel mileage. Wheel weight and tire compound/tread design have a bigger impact.
I'll buy that, up to a point. A fairley easy way to look at that is when its raining= the wide tire has to move more water then a skinner tire. Yes the skinner tire has a longer contact patch then the wider one, same for same.
03-05-2013 06:25 PM
Levi05 If you do some deep research, you will find that wider tires will typically have less rolling resistance. And going to a wider tire doesnt increase the contact patch but only changes the shape of the contact patch (if tire pressures remain the same as before).

It gets complicated but simple answer is a wider tire alone wont hurt fuel mileage. Wheel weight and tire compound/tread design have a bigger impact.

Go to autospeed.com and lookup an article called "tyres, grip, and all that..." <- explains everything. Haha.
03-05-2013 05:44 PM
felixthecat
Quote:
Originally Posted by clayton89 View Post
I know lol. I just know I have seen a few people here complain about their mileage based on increasing wheel sizes, but usually they all increase the width of the tire. I have seen a few people say that with the increase in contact patch will increase friction with road surface leading to less MPGs
Thats where friction comes in= more friction= more stick. Get mpg eco type tires & you'll loose friction but have better mpg.
03-05-2013 05:21 PM
clayton89 I know lol. I just know I have seen a few people here complain about their mileage based on increasing wheel sizes, but usually they all increase the width of the tire. I have seen a few people say that with the increase in contact patch will increase friction with road surface leading to less MPGs
03-05-2013 05:03 PM
wrc_fan don't forget the aero impact :D
03-05-2013 04:56 PM
clayton89 OK looking at a post on the forum from Julian at Tire Rack stated that theirs are like 19lbs a piece shown here and over on this discussion it looks like the factory may weigh 20.5 lbs (figuring a 18lb tire 38.5 - 18 = 20.5) do you guys think that a total weight loss of wheel weight 5lbs plus the 2lb gain in tire and greater contact patch width would hurt gas mileage or hardly be noticeable?
03-05-2013 04:48 PM
clayton89 just looking on tire rack at a few tires it looks that the 16 inch tires are around 20lbs versus 15 inch tires are around 18lbs
03-05-2013 12:13 AM
bringler26 It depends on the tires really. My 16" tires around 25lbs each and my 17" tires are about 20lbs each. The wheel weights I do not know off hand but i had looked the weight of my tires on tirerack.
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