Reviewer:
John Ellsworth
from Marlborough, MA United States
I bought a few of the 650B tubes up here a while ago, and got the Schwalbes.
Unlike the previous reviewers, I prefer Presta, and long ago swapped the one Schrader bike I had over. But I was bugged by the oversize hole, and the fact that the presta nut doesn't sit right on it. But with these Schwalbes, I notice that the Presta stem nut is profiled with a little flange to fit into a Schrader rim hole, allowing it to fill the gap without needing a grommet. Very cool!
The tubes hold air, as one would hope, but the attention to detail from Schwalbe is icing on the cake!
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0 of 1 people found the following review helpful:
Auto Valves Only Please & Thanks
February 23, 2013
Reviewer:
Nelson Hollins
from Scarboro, ON Canada
The 1st thing i do is drill out rims for the Shraeders; 21/64" & then install new Schwalbe's. The Presta-to-Schreader Adapter leaks, & is fussy. Most pumps with dual valve holes need the nozzle lock lifted only 1/2 way , or else you cannot fill the presta. Presta is 1 of the worst inventions. No gas stations anywhere can fill Presta's.
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1 of 3 people found the following review helpful:
Presta -- No!
January 6, 2013
Reviewer:
Mark Holm
from Monroeville, PA United States
I'm with Marty on this one. Bicycles only use the Presta valve because it was available at a point in time when rims needed a smaller hole, or perhaps because of some even less logical reason. The plain fact is that the Presta design is dumb! Perhaps the dumbest aspect is leaving fragile and essential parts hanging out in the breeze, right where they are most subject to damage. The only time I have had a flat tire in the last few years was because of a damaged Presta valve wire. Never would have happened with a Schraeder. And, you know what? I do not, and will not ride tires narrower than 35mm. I am perfectly happy with rims a couple of mm wider, drilled for Schraeder. Why does Rivendell, a proponent of wider tires, insist that flawed valves, needed only on narrow rims, are the best? Beats me.
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1 of 6 people found the following review helpful:
Who really loves Presta valves?
November 3, 2012
Reviewer:
Marty
from Oakland, CA United States
Nothing wrong with these tubes except the valve -- and they are no worse than any other Presta. But they are no better either -- and that's a problem.
We evolved Prestas when rims got so thin that the Schraeder valve holes were too big. But Presta stems snap or come loose, they leak, the pumps attachments are inelegant. Plenty of experienced riders carry extras for this reason alone.
We need a smarter bike tire valve -- ideally backwards compatible w Presta or sold with pump adapters, but we need to retire this technology.
Presta nut -- Schwalbe? 
Auto Valves Only Please & Thanks 
Presta -- No!