I recently put a set of Firestone Destination 265/70/17 M/T's on the FJ. I am assuming that my gas mileage will suffer. But am I correct to assume that any difference in MPG will be the result of added weight of the tires. Or does it have to do with the tread design?
I apologize if this has already been discussed on here. I did a search but didn't see the actual cause.
It should be because of the tire weight. Tread design should not some into the picture unless you are running a square wheel that makes it impossible for the wheel to make a rotation (he-he).
A mud tire will have more rolling restistance. I will decrease gas mileage a little, but exactly how much depends on the tire. Tread designs will definetly make a difference. The Firestone tire will have better compounds and overall design process than say a private label tire.
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Re: Mud Terrain tires and gas mileage
Quote:
Big Country previously said:
A mud tire will have more rolling restistance. I will decrease gas mileage a little, but exactly how much depends on the tire. Tread designs will definetly make a difference. The Firestone tire will have better compounds and overall design process than say a private label tire.
That's what I would think. I mean, ever try a mountain bike (offroad) tire on the road vs. a skinny racing tire? BIG diff. So if the mtn bike were gas powered, it would take more gas to achieve the same speed as the road bike.
Speaking of which, I need to get out on my bike today instead of hanging out on here...
On my Destination MT's, I noticed a very noticeable difference in braking and in acceleration due to all of the extra rubber. Now I try to be more of a crawler and less of a roadster
It is definitely different than my Celica All Trac Turbo
I used to get gas mileage before I put on the 35"x 17 x 12.5 Toyo MT's, now not so much!
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Mountain bike tires have a thicker sidewall, hence making it heavier. Rolling resistance due to tread design is not the major culprit in lower gas milage, it's really the heavier sidewall of the mud terrains. Its called rotational mass. The extra weight is further away from the rotation point, hence it is harder to spin.
Mountain bike tires have a thicker sidewall, hence making it heavier. Rolling resistance due to tread design is not the major culprit in lower gas milage, it's really the heavier sidewall of the mud terrains. Its called rotational mass. The extra weight is further away from the rotation point, hence it is harder to spin.
at higher speeds, the large void ratio will catch more air making it more resistance, but enertia is much greater due to the added weight.
Agreed, but the increase in rotational mass is still the major cause of decrease in gas mileage. Both of them together make it worse, along with anything else that makes the vehicle heavier (bull bars, winches, bumpers, etc.) or less aerodynamic (roof rack, light on a roof rack, tires on the roof rack, etc.).
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