Quote:
Originally Posted by Execut1ve
I'm in the fantasy stage of putting bigger tires on my truck. I'm considering the interaction between tire size and fuel mileage. Currently on the truck the tires are about 29" and I would be stepping up to 31's or 33's if I went bigger.
Pros: lower RPM at cruising speed
Cons: tires weigh more and have greater moment of inertia
Not sure: larger tires act like taller gears, so I would probably experience reduced power and acceleration from a stop. unsure how that would influence fuel econ
Anyone else want to weigh in? Any thoughts on what the overall effect on fuel econ would be? Thanks!
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What is the stock size? Are you over or under that?
1. where is the sweet spot in RPM for your best highway mileage?
how much of your driving is highway?
2. how fast are you going mph at that point?
3. go to a tire site and get the diameter on your current tire and your dream tire.
4. remember, your just trying to go taller not wider.
5. Look at the wieght difference?
6. Do you go thru brake pads right now? if so don't add too much wieght
It is a trade off. but you have to really concider the queastions first.
I run 255/45/18 instaed of 245/45/18. It's 3.4% larger diameter. I do 60% freeway driving. My rpms are at 1800 at 57mph. THe increase in mileage was probably 8-9% ( i changed tire size long before I got to this site)
It worked for me. But if I was just a city driver, I don't think there would have been a decernable difference.