On Wednesday, April 18, 2018 at 12:13:34 PM UTC-7, duane wrote:
On 18/04/2018 1:02 PM, Joerg wrote:
Just received some 25mm Vee Rubber road tires and it says 7bar 100psi
max on the side. That's a bit low for my taste.

The Zafiro I have on there now says 100psi min and 130psi max which is
more up my alley.

By how much can a low max rating be exceeded? I like 100-115psi on my
road bike in back. On the front I won't exceed the max because a
blow-out would be nasty and that carries less weight anyhow.


Are these both the same size tire? 100 psi sounds right for 25mm tires.
100 - 130 psi sounds like 23mm.

And running the Zaffiro at maximum pressure results in really poor wet grip, speaking from experience.

Also, why would Joerg want a HP 25mm tire in super-gnarlyville? With all the ad hoc trail riding and massive loads, he should have a 32mm tire minimum. And not a Zaffiro, which are flat-prone. If his bike won't accommodate a tire of that size, may that's a reminder that he's riding the wrong bike.

As for the Vee Rubber, I wouldn't run a $10 25mm tire beyond its maximum recommended pressure. God knows whether the bead wire is any good or what pressure will blow-off the tire or blow-out the sidewalls -- or separate the bead wire from the sidewall. The thing would probably ride like a rock above 100psi anyway.

-- Jay Beattie.