SOC 14: Hutchinson Fattens Up with New 25mm Fusion 3 Road Tubeless

I’ve been rolling Hutchinson Fusion 3, Atom and Intensive tubeless tires for the past ~4 years, they’ve been excellent (except for 1 that bubbled and cracked early in its life). So a better Fusion 3 is most welcome. But how much better is it really? Maybe a bit more description of this test would help…

All these rolldown tests are great, but how about a test that applies power to the wheel and see how much is transfered to the ground – ie, like climbing a hill. Testing casing squirm/deformation.

A measure of input is necessary for those claims to carry any weight. We aren’t in a vacuum, a billiard will roll farther than a ping pong ball.

Technology for tubeless has moved on passed Hutchy. They were around early, but have failed to push the tech and benefits in a appealing and beneficia way. Try something from others, like IRC or Schwalbe and you realize that in a big way, it’s like stepping into whole new world. Step up Hutchy, step up….

Also, what about tire pressure during the test? I’ve heard that for the SAME pressure, 25mm tires roll faster than 23mm tires. Most of us want to run bigger tires for LOWER pressure and more comfort.

Steel drums are only useful for comparing different tyre models in the same size and at the same pressure. They are pretty much useless for comparing the same tyres in different widths as they don’t take into account the roughness of the surface and its effect on the rider.
The major advantage of wider tyres is ability of running them at lower pressure which on any surface other than very smooth tarmac will results in lower rolling resistance due to reduction of vibrations/vertical movement of the bike/rider.
Harder feels faster, softer is faster.

I agree with the above statements about a roll down test not being the most accurate reflection of the realities of rolling resistance, but I did at least find out a bit more detail on the magnitude of the claimed improvement. The effect size was pretty substantial:

“Hutchinson did rolling resistance tests on the 23 and 25mm tyres and found the 25mm to go further, said the company’s North American representative Richard Goodwin. “In the roll-down test, the 23mm tyre went 500m, and the 25mm tyre went 660m with all other factors the same,” Goodwin said.”

Is it true 25mm when mounted?
Their Intensives ’25mm’ were actually 23mm when mounted.
Their only true claimed width is the Sector 28mm which actually is 28mm.

23 and 25 tire tubekess are available yo work with wide rim c19 or c21? I thonks ybut standard etrto said no….