We picked up a used tandem and have been commuting on it. A bunch of flats later, I decided enough's enough and get some Schwalbe Marathons. Things are good, much better, until today--hit a nail just right enough to go through one side of the tire and out the other. The other side is actually part of the tread and just a pinhole, so I figure that will be OK to ride on. The sidewall has about a 1/4" tear where the nail must have ripped some of the casing. We limped the rest of the trip to work, about 3 mi, with the tire pumped to about 60psi and when we got to work, I could see a bit of the tube sort of poking through sidewall hole.

Is this something I can fix? Would a patch on the tire (not tube, patch would be on the inside of the tire) over the tear work at all? This tire has less than a couple hundred miles on it and it would be a real shame to have to toss it.