Tires vs gas milage - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 13 Old 08-12-2017, 08:30 PM Thread Starter
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Tires vs gas milage

Currently running stock Trailwings on my DL1000.
I am looking at putting on some K60's.

What should I expect in gas milage difference?

Thanks

Jeff
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post #2 of 13 Old 08-12-2017, 08:51 PM
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Shouldn't be much. Unless you put really tall tires on and go slow I doubt you'll see any.
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post #3 of 13 Old 08-12-2017, 09:28 PM
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Originally Posted by notacop View Post
Shouldn't be much. Unless you put really tall tires on and go slow I doubt you'll see any.
I agree that it will be a small enough difference that it would take pretty careful measurement to codify.
In principle there are two conflicting conditions in play with tire size and fuel mileage. One is if the tire is taller than original one gains final drive (gear-ish) ratio. The other is an increase in rotational resistance that comes with a taller and/or heavier tire. Where those to lines cross exactly can be left to the smart kids. But when you look at cars designed solely for fuel efficiency they all have the smallest wheels practical. It appears that the tax for resistance is greater than the revenue of ratio.

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post #4 of 13 Old 08-12-2017, 09:51 PM
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Geeky Tire Trivia

For folks who give a flip, Avon publishes how many revolutions per mile / km each tire size turns.
The tires on my V2 turn the rear tire 30 more revolutions per mile than does the front tire.

I guess that means that the computer engineers for traction control must be calculating the difference / change of percentage of wheel rotation rather than the the actual "speed" change before activation so as to accommodate non-OEM tires. Like I said - trivia.

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post #5 of 13 Old 08-12-2017, 11:36 PM
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I have a 650 and the K60s caused by mileage to drop about 5 to 7 mpg over Trailwings back in 2009. More aggressive tread. for the 1000 I don't think you will see as much a drop.

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post #6 of 13 Old 08-13-2017, 08:25 AM
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I noticed a ~2 mpg change when I went from nearly bald tires to new on my truck. I would assume the more tread increases: rolling resistance - better grip, air resistance - deep tread, rotational resistance - heavier around the outside edge. But a newer tire with new tread should deform less (improve gas mileage) at same air pressure and have a smaller contact patch than a thin / pliable worn tire.

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post #7 of 13 Old 08-13-2017, 09:09 AM
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It will definitely decrease your mileage, but hard to say by how much. It makes a big difference on car tires. Look at the special low rolling resistance tires they put on the Toyota Prius for example.
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post #8 of 13 Old 08-13-2017, 09:28 AM
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I would say I lost 2-3 mpg when going from Michelin Pilot Road 4's to the Continental TKC 70. Nothing I checked and calculated, but an obvious reduction.

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post #9 of 13 Old 08-14-2017, 06:13 AM
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More confidence give you a tire, more speed on corners, and more revs results in a reduction of gas millage IMHO. Also, an A/T tyre ups the consommation versus a S/T tyre, on road.

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post #10 of 13 Old 08-14-2017, 08:05 AM
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The other thing that throws off the calculation is that speed and distance are not measured directly (unless you use GPS). Instead, both speed and distance are calculated backwards from wheel revolutions (on an ABS bike, which has sensors on the wheels), or even countershaft revolutions (non-ABS bikes).

This means that tire circumference changes (e.g. replacing old, worn tires with new ones) also lead to apparent mileage changes. Ditto for changes to front/rear sprocket tooth count on non-ABS bikes.

On a 19" tire, 5mm thread wear leads to a reduction of circumference by a fraction over 1%.

Last edited by BackPacker; 08-14-2017 at 08:10 AM.
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