Jan heine on tyres.

Moonbiker

Following on from wide tyres are faster:

Our on-the-road experience suggests that even 42 mm-wide tires do not roll slower than 25 mm tires

https://janheine.wordpress.com/2014/01/ ... -too-wide/

Now on tyre pressure:

Of all our research on tires, the most revolutionary finding is this: Tire pressure has almost no effect on a tire’s speed.

https://janheine.wordpress.com/2015/01/ ... evolution/

Whae do you think? 8)

desweller

Any idea how they run their tests? I'm not shelling out for the mag.

Moonbiker

I don't subsrcibe, there is some discussion of the testing methods it in the comments, but its abit technical for me to understand.

See Tom Anhalt’s comments

desweller

Mm. Anhalt and Simmons seem like they understand how to qualify a gauge setup better than Heine, that's for sure. Not convincing (even if the conclusions happen to be true).

ugo.santalucia

Standard RR tests are done on perfectly smooth rollers, which do not reflect the reality of the road. The bigger the grains in the tarmac, the less reliable these tests become.

So yes, on some roads you will find a 42 mm tyre at 30 PSI faster than a 23 mm tyre at 120 PSI, while on other roads it will be the opposite.
You have to match the tyre with the area you live in...

cougie

All i know is that when I used to TT on tubs - we thought harder the better - which ended up in the back wheel bouncing over the smallest piece of grit - so I don't think that worked too well.

papavero

http://youtu.be/jsxP7SYRF60