EV specific tyres

Dardania

Interesting development, Goodyear are bringing out a tyre customised for the different parameters of an EV compared to ICE - able to withstand higher torque, tougher sidewalks for greater weight, and less rolling resistance

Goodyear Designed A Tire For Electric Cars That Won't Shred So Easily From All That Torque
https://jalopnik.com/goodyear-designed-a-tire-for-electric-cars-that-wont-sh-1823615854/amp

Wonder what it’s like in the corners - all of those specialisations suggest less lateral grip.

KCross

I reckon its a bit of marketing BS where they will try to get EV drivers to pay a premium price for something that wont make a whole lot of difference.

If that tyre is so good it would be suitable for all cars, not just EV's.

Dardania

I was thinking the same (that they would put it on ICEs if it was good enough) however one of the comments about the tyre I saw is that you can presume the weight on it is consistent. Whereas with an ICE, the weight will change as fuel is burned up. So in an ICE, maybe the compound needs to accommodate that change in weight, down to a lower initial weight, whereas with an ICE, the weight will be more consistent, and generally heavier

brianwalshcork

One adult passenger will weigh the same/more than a full tank of fuel

CJhaughey

Instant torque from Idle is the primary driver for these I'd say, but worryingly for wet conditions the channels are smaller and that means less ability to reduce aquaplaning.

Del2005

Anything with less rolling resistance can't be good on car. The Chinese cheap tyres have low rolling resistance and are know as ditch finders, these could be ditch finders from a reputable brand.

goz83

Dardania wrote: »

I was thinking the same (that they would put it on ICEs if it was good enough) however one of the comments about the tyre I saw is that you can presume the weight on it is consistent. Whereas with an ICE, the weight will change as fuel is burned up. So in an ICE, maybe the compound needs to accommodate that change in weight, down to a lower initial weight, whereas with an ICE EV, the weight will be more consistent, and generally heavier

FYP

brianwalshcork wrote: »

One adult passenger will weigh the same/more than a full tank of fuel

Agreed. Plus, the same tyre is fitted to many types of car with wildly varying weights.

I would say the main difference in weight is the engine and where it's placed. So in most cases, the front tyres carry the most weight and there is a higher centre of gravity. At least in an EV, the weight is more evenly distributed across the chassis and the CoG is much lower, saving additional wear on camber.

Donnelly117

CJhaughey wrote: »

Instant torque from Idle is the primary driver for these I'd say, but worryingly for wet conditions the channels are smaller and that means less ability to reduce aquaplaning.

I know they would all generally be sold and run on performance tyres but surely ICEs with good power and launch control are putting down as much if not more instant torque as an ev (aside from Teslas)? Less frequently obviously as people don't launch cars hard every time but surely EV drivers aren't mashing the throttle through the floor every time either!

cros13

Donnelly117 wrote: »

....but surely EV drivers aren't mashing the throttle through the floor every time either!

At least in my case, full pedal from every light.
Why not? We don't suffer the downsides of increased fuel and maintenance that ICE drivers do. And we have all that electric torque...

There are plenty of developed for EV tires out there like Nokian's Hakkapeliitta R2. While they all have great rolling resistance people forget that the sacrifice you are making for that is grip.

Even for winter tires I prefer the Nokian WR D4 to the R2 because the whole reason I'm putting winters on the car is for grip.

To tell the truth, inflating your tires to the correct pressure is likely to make a bigger impact on range.
Many EVs recommend higher than usual tire pressures and garages are unaware..... practically every time I've changed the tires on my i3 I've been handed the car back with the tires under-inflated by at least 0.4 bar.

CJhaughey

I notice that with my latest Michelin Pilot Sport 4 my average fuel consumption has gone way up, grip is phenomenal compared to the Goodyear Efficientgrip performance I had before.

With tyres there is no magic bullet, grip will cost you in fuel.
You pays your money and takes your pick.

You want range and low fuel costs? pick a harder compound that has a stiff carcass and soft sidewalls.

You want grip pick a softer compound soft carcass and hard sidewalls.

Dardania

cros13 wrote: »

Donnelly117 wrote: »

....but surely EV drivers aren't mashing the throttle through the floor every time either!

At least in my case, full pedal from every light.
Why not? We don't suffer the downsides of increased fuel and maintenance that ICE drivers do. And we have all that electric torque...

There are plenty of developed for EV tires out there like Nokian's Hakkapeliitta R2. While they all have great rolling resistance people forget that the sacrifice you are making for that is grip.

Even for winter tires I prefer the Nokian WR D4 to the R2 because the whole reason I'm putting winters on the car is for grip.

To tell the truth, inflating your tires to the correct pressure is likely to make a bigger impact on range.
Many EVs recommend higher than usual tire pressures and garages are unaware..... practically every time I've changed the tires on my i3 I've been handed the car back with the tires under-inflated by at least 0.4 bar.

? Of course taking off to accelerate quickly uses more energy...?

cros13

Dardania wrote: »

? Of course taking off to accelerate quickly uses more energy...?

Yes, but electricity costs half nothing so it doesn't matter.

80sDiesel

cros13 wrote: »

Yes, but electricity costs half nothing so it doesn't matter.

Matters to the environment.

Dardania

cros13 wrote: »

Dardania wrote: »

? Of course taking off to accelerate quickly uses more energy...?

Yes, but electricity costs half nothing so it doesn't matter.

Does on your range if you have a limited battery. But I take your point, electrical energy is phenomenally cheap versus petrol. I even think petrol is cheap for what it does for you.

unkel

Donnelly117 wrote: »

EV drivers aren't mashing the throttle through the floor every time either!

Eh, yes we are

Del2005

Del2005 wrote: »

Anything with less rolling resistance can't be good on car. The Chinese cheap tyres have low rolling resistance and are know as ditch finders, these could be ditch finders from a reputable brand.

Design parameters for tyres are grip on braking cornering and acceleration on dry and wet on various temperatures, resistance to aquaplaning, noise, comfort, rolling resistance, price, how they handle after losing grip, wear rate. Probably other parameters too.

Designing a grippy tyre with low rolling resistance is totally doable and that's what you pay on properly designed tyres. Bad ditch finder type of tyres more often than not also suffer from poor fuel economy as the carcass of a low rolling resistance tyre has to be quite stiff and those are difficult to design for the tyre not to become difficult to drive, noisy and uncomfortable. Read some proper tests to find out more about tyres.

KCross

samih wrote: »

Designing a grippy tyre with low rolling resistance is totally doable and that's what you pay on properly designed tyres.

I'd be interested in what tyres tick all the boxes.
What do you use samih?

I suppose even if you get a grippy tyre with low rolling resistance it will wear quicker so again a tradeoff. Its finding that sweet spot where you wont find a ditch, get reasonable efficiency, decent mileage within budget.... its fine to say buy top of the range Michelin's but at €150+ per corner you have to balance that with another good quality tyre that will last longer.

I last bought Goodyear Efficientgrip performance 95W which indeed perform great on wet compared to the OEM Dunlop without affecting the range. I reckon they won't last 60k plus unlike the previous tyres but so is life. These were about 100 a corner for 215/50-17.

There was a new tyre review on a magazine I read this month and they said this from the two Chinese brands in the test: Nankang Sportnex AS-2+: Good: resistance for aquaplaning Bad: Grip in dry and wet, rolling resistance. So don't get those anyway. Triangle Sportex TSH11: Good: Decent (=not good, but adequate) lateral grip in wet. Bad: Grip under braking on dry and wet. Difficult to control under wet conditions. Gislaved Ultra Speed was rated even worse but unlike the two at least it had good efficiency in comparison. Bad was grip and handling on both dry and wet.

Michelin Pilot Sport 4 was ranked the best and for it they said: Easy to control under all the conditions and good resistance to aquaplaning. Nothing negative.

KCross

samih wrote: »

I last bought Goodyear Efficientgrip performance 95W which indeed perform great on wet compared to the OEM Dunlop without affecting the range. I reckon they won't last 60k plus unlike the previous tyres but so is life. These were about 100 a corner for 215/50-17.

Yea, I've had those Goodyears too... got 20k km's out of the front.
Got 30k km's out of the original Dunlop OEM's

samih wrote: »

Michelin Pilot Sport 4 was ranked the best and for it they said: Easy to control under all the conditions and good resistance to aquaplaning. Nothing negative.

They are expensive. About €40 per tyre more expensive! I'd have to think long and hard before I could justify that extra spend.

zilog_jones

I also have Goodyear EfficientGrip Performance on my Prius, but after only about 25k km two of them need replacing - though more because of bad tracking (uneven wear) than anything else. I found them pretty good until recently, now they're near the legal limit they are not so great in the wet.

KCross

KCross wrote: »

samih wrote: »

I last bought Goodyear Efficientgrip performance 95W which indeed perform great on wet compared to the OEM Dunlop without affecting the range. I reckon they won't last 60k plus unlike the previous tyres but so is life. These were about 100 a corner for 215/50-17.

Yea, I've had those Goodyears too... got 20k km's out of the front.
Got 30k km's out of the original Dunlop OEM's

samih wrote: »

Michelin Pilot Sport 4 was ranked the best and for it they said: Easy to control under all the conditions and good resistance to aquaplaning. Nothing negative.

They are expensive. About €40 per tyre more expensive! I'd have to think long and hard before I could justify that extra spend.

How about Dunlop Sport Maxx RT2: Good: Well balanced performance. Low rolling resistance. Bad: Slow response at extreme conditions.

Hankook Ventus S1 Evo2 and Vredestein Ultrac Vorti both have good grip but the rolling resistance was poor which is not great for an EV.

KCross

samih wrote: »

How about Dunlop Sport Maxx RT2: Good: Well balanced performance. Low rolling resistance. Bad: Slow response at extreme conditions.

Hankook Ventus S1 Evo2 and Vredestein Ultrac Vorti both have good grip but the rolling resistance was poor which is not great for an EV.

I used Vredestein before on an old ICE and was happy with them and I've heard good things about the Vredestein Ultrac Satin (30k miles in a Leaf SVE) which is rated A for wet, B for noise and rolling resistance and price is reasonable... might give them a try next time around....

https://www.tyreleader.ie/car-tyres/vredestein/ultrac-satin/215-50-zr17-95w-622106