Originally Posted by
coominya
No, and factory tubes too. But the toughroad comes out with 700x50, whereas your DS4 runs 700x38. As you rightly noted, the bigger the tire the longer for a pressure drop. That's just based on volume. Also the lower the pressure run the lower the drop. What pressures do you run?
Oh, add some user error into my calculations too. I pump my tires up with a 12V car pump, and not an expensive one, so the gauge probably isn't all that accurate, but to within 2 or 3 psi I believe.
Okay, I see that we're both running different set ups, I have to remember that my "hybrid" is really more of a road bike now. I run 100psi in my 700x28 Schwalabe Marathon Plus' and will lose 5-10 psi in a week, I'm using the stock tubes that came with the bike.
I think your 2-3 psi a week sounds about right with your set-up, but if you're only losing 2-3 a month, thats just awesome.
