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Re: Taller tires = more range on highway?

Posted: Fri Jan 24, 2020 6:42 am
by coloradoman
I have been thinking of upgrading my stock 205/55/16 to 205/60/16. I think it will help with making those bumps and pot holes seem a bit smaller. I wasn't sure though if it will actually help with my range, since I am mostly driving at 65-80 mph. I won't do it if it decreases my range. Fixing the darn spedo with it being fast by 5% would be another bonus.

Like in gas cars, taller tires generally help keep the rpms down at highway speeds which helps mpg. With electric cars, I really have no idea if it will help. I think the thing that kills the range on electric cars is wind resistance and weight.

Here would be the actual difference in diameter between these sizes.
24.9"
25.7"
+3.2%
I am thinking each tire would probably weight maybe a lb more.

Re: Taller tires = more range on highway?

Posted: Fri Jan 24, 2020 8:59 am
by GerryAZ
You can go up one size in aspect ratio (middle number) without significant impact to efficiency. Tire rolling resistance makes more difference than size. I put one size larger Bridgestone Ecopia Plus tires on my 2015 and saw an increase in efficiency compared to the sport performance Continentals I had on it before or the OEM Michelins. Original size was 215/50 R17 and the Bridgestones were 215/55 R17. Also, the 215/55 R17 size was readily available and a little less cost than special order to get original size.

Re: Taller tires = more range on highway?

Posted: Sat Jan 25, 2020 6:45 am
by coloradoman
GerryAZ wrote:
Fri Jan 24, 2020 8:59 am
You can go up one size in aspect ratio (middle number) without significant impact to efficiency. Tire rolling resistance makes more difference than size. I put one size larger Bridgestone Ecopia Plus tires on my 2015 and saw an increase in efficiency compared to the sport performance Continentals I had on it before or the OEM Michelins. Original size was 215/50 R17 and the Bridgestones were 215/55 R17. Also, the 215/55 R17 size was readily available and a little less cost than special order to get original size.
Why would you see an efficency increase? It doesn't make sense. That is probably a whole inch larger in diameter. Everyone here has been saying you should have had a decrease

Re: Taller tires = more range on highway?

Posted: Sat Jan 25, 2020 6:53 am
by LeftieBiker
Tire rolling resistance makes more difference than size.

That is why.

Re: Taller tires = more range on highway?

Posted: Sat Jan 25, 2020 8:35 am
by Oilpan4
I second that.

I tried to put 2 tires that were considered "average rolling resistance" according to the euro tire rating system and they killed my range, I went from 4 miles per kwh down to 3.
After 4,000 miles they had gotten a little better but I had to replace them with real high end Michelin tires with an A+ LRR.

Here is a file from a 2011 article that I found a few years ago, but now the link is dead.
tirempg.jpg
I searched around and found the only tire that could beat the ecopia was the energy saver, as far as tires sold in the US.

Re: Taller tires = more range on highway?

Posted: Sun Jan 26, 2020 1:30 pm
by HerdingElectrons
In the world of PriusChat nothing trumps Michelin Energy Savers if you're doing your part behind the wheel for efficiency & they have a far larger user base to improve n factor

Re: Taller tires = more range on highway?

Posted: Sun Jan 26, 2020 2:00 pm
by DougWantsALeaf
I find the Michelin’s on our SV+ excellent in both efficiency and road traction.

Re: Taller tires = more range on highway?

Posted: Sun Jan 26, 2020 5:30 pm
by GerryAZ
I found Bridgestone Ecopia Pluses to have much better wet traction and lower rolling resistance than the OEM Michelin Energy Saver A/S tires that came on the 2015. The OEM Michelins on the 2019 seem to have a bit better traction than the ones that came on the 2015, but I will still put something better on as soon as they wear out.

Re: Taller tires = more range on highway?

Posted: Thu Jan 30, 2020 11:56 am
by coloradoman
I am guessing 2 sets of tires of the same brand and type with different sizes, one being taller than the other will lower range for the taller one?

Re: Taller tires = more range on highway?

Posted: Thu Jan 30, 2020 3:38 pm
by rmay635703
205/65r16’s would likely fit fine and be cheaper to source but may kill your range if not Lrr