Originally Posted by
Up North
I run 23-25 Conti lightweight tubes in Conti 4000s11's 25 inflated to 95 front and 105 back with air. Morning ride to evening ride I'm ok. Over night I drop 5-10 lbs easy. Before the conti tubes I ran spec tubes no difference. If OP can run run month or two on 23's with no air he 's gotta special tubes.
Prathmann, I was aware that thinner tubes do bleed air as well. I thought I'd keep it simple as Schreader valves typically on your thicker tubes and Presta on thinner. However, I did listen to two guys discussing this very topic to death one day. The one guy an engineer maintained they had done testing for one of the tire companies and the presta valve itself bled air contrary to everyone's belief. He said they submerged inflated tubes and videoed them over 24 hrs. That was his story, sounded like he had all the facts????
The mountain bike is the 1 month bike, the road bike loses about 2 PSI / week and I average around 200 miles a week. Continental tubes & tires, 700x23, 110/115 PSI 220lb rider. Dunno, just works?
Even after doing a century on bumpy country roads, then checking them two days later...3 or 4 PSI is the absolute most I've ever seen either tire go down the day after a rough ride.
Was super paranoid about tire pressure when I first got the road bike...would squeze the tires every few miles to see how they felt. I'd convince myself they were way low, like 10 PSI, then when I checked it'd be 0-2. Gradually I checked less frequently because I didn't see the need.