I've got a Specialized Pitch, size 27.5". I do a lot of urban MTBing and tricking.
I know how to ride up stairs - up to four stairs at the moment, working on getting more - you lean back, get the front wheel up the first three or so, then lean forwards and pedal, keeping the weight off the back wheel. I work up a bit of speed and then pedal up, with gears set at 1 in the front and 3 in the back (I've got 3 in front and 8 in the back). The back wheel is at ~40 PSI.
But consistently, I'll make it up this staircase ~5 times in a row, and then, at some point, inevitably, I'll get a pinch-flat puncture.
This has been the main expense on the bike recently - this one staircase has cost me hundreds in replacing the inner tube.
Is there anything I can do to avoid getting these punctures? Am I simply not doing it correctly?