Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - 50% of your EV energy consumption comes from wheels and tires

Isaac Zachary · 10-13-2023, 05:20 PM

My take on it is this:

You have a twisting force that causes the side walls to flex.
At the same time you have more downforce due to inertial forces caused by acceleration, which makes the tires squat.
Does this really reduce the radius and thus increase torque? Of this I'm not certain, as with every turn of the wheel the outer circumfrence of the tire does not change and therefore you get generally the same distance per turn with or without the sidewall flex.
We are dealing with flexible structures here (tires) and trying to apply the math that applies to solid ones (force x radius). But maybe it's more like a pulley (small diameter wheel pulling on larger diameter wheel).

10-13-2023, 05:20 PM	#61 (permalink)
Isaac Zachary High Altitude Hybrid Join Date: Dec 2020 Location: Gunnison, CO Posts: 2,075 Avalon - '13 Toyota Avalon HV 90 day: 40.45 mpg (US) Prius - '06 Toyota Prius Thanks: 1,128 Thanked 584 Times in 463 Posts	My take on it is this: You have a twisting force that causes the side walls to flex. At the same time you have more downforce due to inertial forces caused by acceleration, which makes the tires squat. Does this really reduce the radius and thus increase torque? Of this I'm not certain, as with every turn of the wheel the outer circumfrence of the tire does not change and therefore you get generally the same distance per turn with or without the sidewall flex. We are dealing with flexible structures here (tires) and trying to apply the math that applies to solid ones (force x radius). But maybe it's more like a pulley (small diameter wheel pulling on larger diameter wheel). __________________ Last edited by Isaac Zachary; 10-13-2023 at 08:16 PM..