thunderstorm80
1 kW
- Joined
- Mar 29, 2016
- Messages
- 383
Let's compare two tires - one 28x2inch wide and the second 26x4inch wide. (so both would have more or less same circumference and so we can take the circumference out of the discussion)
Let's also assume that both tires are made from the same compounds and have the same thread pattern for road. The only difference is the size and width.
Assuming the 2inch runs at 60PSI, the 4inch would need 15PSI to have the same tire deformation = same rolling resistance.
With those pressures, it will still be said that the fatter tire robs more energy.
Why is it so?
I ask without talking about the aero-drag. I know the fatter tire cause more drag, but it's negligible at slow speeds (like 20kph)
I also know that the rotational mass is higher, but I ask about steady state conditions.
Thanks for any help about this
Let's also assume that both tires are made from the same compounds and have the same thread pattern for road. The only difference is the size and width.
Assuming the 2inch runs at 60PSI, the 4inch would need 15PSI to have the same tire deformation = same rolling resistance.
With those pressures, it will still be said that the fatter tire robs more energy.
Why is it so?
I ask without talking about the aero-drag. I know the fatter tire cause more drag, but it's negligible at slow speeds (like 20kph)
I also know that the rotational mass is higher, but I ask about steady state conditions.
Thanks for any help about this