EV tyres. Make me smart
- Thread starter Django x2
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Soldato
My question was around how steel train wheels for low rr also have low grip so can’t function in Mashers world of logic… ie open his eyes away from his binary logic of one or the other!
Not how do they actually work!
Cinturato is Italian for belted if that gives you a clue what can be tuned in tyre construction aswell as compound choice and tread block design.
#Masherwillignore
Not how do they actually work!
Cinturato is Italian for belted if that gives you a clue what can be tuned in tyre construction aswell as compound choice and tread block design.
#Masherwillignore
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It's a great video TBH, explains everything we are talking about here, resistance, grip, comparison to cars, leaves on the line. It's an interesting watch.
Soldato
Yeah good stuff will watch later.
The reduction gearbox on my Kona EV was 7.981:1, so the 395Nm out of the motor is instantly multiplied up to over 3,150Nm; that's a big loada torque being instantly requested of the tyres. A Tesla Model 3 rear motor is 9.0363:1, and with 420Nm that's shoving just shy of 3,800Nm into the tyres.
EV motor output is multiplied, it being a single-speed reduction make no difference at all; gear reduction produces multiplied torque. EV tyres therefore need deal with a lot of torque.
Soldato
Same as an ICE. Do the maths for first gear. The other benefit of EV in terms of road to rubber interface is non of the hundreds of combustion grip-slip events every second.
Soldato
No. Just speed ratings are the one to watch.
You just won't be able to put all of that torque down on the road, using road tyres. It's an on paper stat only really. If you try you'll just get traction control going nope.
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Soldato
Some fag packet calcs would show ICE has more anyway so what point is being made here do you think Nasher?
Model 3 no problem at all with “road tyres”. If you have drove one you would know this.
Paper stat > MasherFact
Model 3 no problem at all with “road tyres”. If you have drove one you would know this.
Paper stat > MasherFact
Yeah - it is all a bit relative but for example the Bridgestone Turanzas have low rolling resistance but perform well to excellent in the wet including wet braking albeit they've been somewhat superseded by other tyres in more recent years - though even that is a bit of a complicated story because just being able to stop quickly isn't always the whole story - for example a tyre which has more control under heavy braking can in many ways be more ideal than one which in benchmarks can bring you to a stop in a shorter distance. (Which is why I dislike the way some tyres have been hyped to the heavens* based off Tyre Reviews, etc. reports, even with their attempts to include subjective comparisons which actually if you do a fair bit of driving on them might not be overall as good as the 2nd or 3rd place tyres).
But yeah a tyre which has low rolling resistance isn't necessarily a joke in the wet.
* Something I find a bit funny is seeing some of the car forums where certain tyres are hyped up, but in UK use all year around they are more of a liability than anything, unless people are regularly tracking and/or extremely talented, there are tyres which will perform just as good as you'll ever be able to utilise on the road and do far better in the broad range of conditions - for example there is a certain agency who uses stuff like modified Mercedes E63s for their response vehicles and you'll generally see stuff like Conti PC7s on those.
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