pan y agua
Join Date: Aug 2005
Bikes: Wilier Zero 7; Merlin Extralight; Co-Motion Robusta; Schwinn Paramount; Motobecane Phantom Cross; Cervelo P2; Motebecane Ti Fly 29er; Calfee Dragonfly Tandem
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650b tube on a 700c wheel?
Sometimes your just not meant to have a good ride. Yesterday everything conspired against us in fixing a flat. Flatted about 9 miles from the house on the start of 50 mile ride.
The hole was a split on the seam on the underside of the innertube, so failure number one was a manufactruing defect.
Pulled out a tube, and found I'd put a 650mm tube ( from my daughter's bike) in the bag. Tried it anyway. Worked for about 100 yards until the tire unseated, and exploded. Not sure if this is just intrinsic in trying to use a 650 tube on a 700c rim. I thought I'd checked closely enough to insure the tube was seated under the tire bead. Apparently not. Failure No. 2 my stupidity.
So, I patched the first tube. Going to inflate the patched tube, the frame pump failed. It was getting old, and the gasket was just too worn to stay in place. So I used the remaining C02 in the one cartridge to get the tire to a rideable level, and the patch doesn't hold. Failure No 3, old age, (the pump's ) and my poor work on the patch.
Next we ride on the flat about a mile to a Walmart. Buy 2 new tubes, and a mini pump. Only problem is the tube has a 32m valve, and won't stick out past even a modestly aero rim. Fortunately, I have a valve extender. Unfortunately, aluminum valve extenders are prone to breaking when used with a mini pump. First valve extender breaks. I go across the street to Academy Sports in search of another tube, or a better pump, both of which they have neither. Failure No. 4, Walmart's stupid stocking decisions.
Next, take the tube out to get the remnants of the broken valve extender off , and put on valve extender no 2. This time, I pump the tire very carefully, get 80 pounds or so in it and we ride home. Fifth time's a charm.
So, to the extent there's a question in this rant, can you actually use a 650 tube on a 700c rim, or was that attempt doomed for failure?
You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.