TPerkin2000 wrote:
In terms of Crr the 28s will only be faster when comparing equivalent tire pressures. Using the BRR testing on the GP 5000 you can see that a 23mm at 100psi has less rolling resistance than a 28mm at 80psi. For the 28 to be faster it needs to be at 100psi. I think people often overlook this and just assume they can run the wider tire at a lower pressure for more comfortable and still be faster. This just isnt true. The aerodynamics are a much tougher sell. Its all in context of the wheel its mounted on. A wheel optimized for 23 or 25mm tires will likely suffer with a 28 because the tire will be wider than the widest part of the rim.
Exactly. Same tire construction and same pressures are the two assumptions behind every "wider rolls faster" claim. (Keep in mind that the same brand/model tire CAN have different constructions for different sizes.) And that doesn't take into account aerodynamics or road surface characteristics. So . . . it depends. And generally speaking, the inflation pressure range for wider tires will have a lower limit than the equivalent narrow tire -- especially relevant for smooth roads.
I suspect most people using wider tires do not pump them up to the same pressure they would use with a narrower tire. That being the case, in the real world, a wider tire is not faster most days.
Last edited by:
FlashBazbo: Feb 28, 19 8:34